Teng Qiu

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Name: 邱藤; Teng Qiu

Organization: Beijing University of Chemical Technology , China

Department: College of Material Science and Engineering

Title: Associate Researcher/Professor(PhD)

TOPICS

Material Chemistry

Physical Chemistry

Polymer

Polypyrrole Polyesters RAFT Block Copolymer Polypyrrole

Chemicals
References

Nanoaramid Dressed Latex Particles: The Direct Synthesis via Pickering Emulsion Polymerization

Co-reporter:Chunjie Xie, Teng Qiu, Jinglong Li, Heling Zhang, Xiaoyu Li, and Xinlin Tuo

Langmuir August 15, 2017 Volume 33(Issue 32) pp:8043-8043

Publication Date(Web):July 22, 2017

DOI:10.1021/acs.langmuir.7b01915

The direct synthesis of polymer microspheres modified by aramid nanofibers (ANFs) is an interesting challenge. This work describes a simple aqueous process to prepare polystyrene (PS)/ANF composite microspheres, where the specific ANF network was “dressed” on PS. ANF was derived from the copolymerization of terephthaloyl chloride, p-phenylene diamine, and methoxypolyethylene glycol and could be dispersed in water stably. We applied the as-synthesized ANF as a Pickering emulsifier in the o/w emulsion of styrene monomer. Radical polymerization was subsequently initiated in the Pickering emulsion system. The combination of ANF with polymer spheres was revealed by scanning electron microscopy (SEM) and thermal gravity analysis. The role of ANF in the monomer emulsion as well as in the polymerization was studied through SEM, optical microscopy, optical stability analyzer, and pulse nuclear magnetic resonance combined with the polymerization kinetic analysis. Moreover, we investigated the effects of other synthesis parameters, such as monomer type, monomer content, pH value, and salt concentration.

The synthesis of hydrophilic molecularly imprinted polymer microspheres and their application for selective removal of bisphenol A from water

Co-reporter:Zehu Wang, Teng Qiu, Longhai Guo, Jun Ye, Lifan He, Xiaoyu Li

Reactive and Functional Polymers 2017 Volume 116(Volume 116) pp:

Publication Date(Web):1 July 2017

DOI:10.1016/j.reactfunctpolym.2017.04.015

The adsorptive materials which have the function of molecular recognition are becoming important as the fast emerging environmental requirements for the analysis and repair of target contaminants present at low concentrations in aqueous matrices. Here, we demonstrate a Pickering emulsion polymerization strategy to build bisphenol A (BPA) imprinted poly(methacrylic acid) microspheres without the traditional organic surfactant. In the synthesis, the only stabilizer is silica particles derived from Stöber process. The molecularly imprinted polymer microspheres were prepared by radical polymerization in the Pickering oil/water emulsion. Both the solid stabilizers and the molecular templates were conveniently removed from the microspheres. The obtained microspheres are of regularly spherical structures and hydrophilic surfaces. The formation of molecularly imprinted sites on the microspheres was validated by the excellent recognition capability toward BPA in the rebinding and competitive binding experiments.

Synthesis of waterborne polyurethane containing alkoxysilane side groups and the properties of the hybrid coating films

Co-reporter:Qi Li, Longhai Guo, Teng Qiu, Weidong Xiao, Dianxing Du, Xiaoyu Li

Applied Surface Science 2016 Volume 377() pp:66-74

Publication Date(Web):30 July 2016

DOI:10.1016/j.apsusc.2016.03.166

Highlights

•: A diol with side-chain trimethoxysilane (DEA-Si) was synthesized using 3-(methacryloxypropyl)trimethoxysilane (MAPTS) and diethanolamine (DEA).
•: The crosslinking structure could in situ formed within the WPU matrix through sol-gel process.
•: The Si tends to shift to the polymer-air interface due to the flexible long alkyl-ester side chain.
•: The incorporation of DEA-Si enhanced mechanical and surface hydrophobic properties of WPU films.

Synthesis of polypyrrole–polystyrene composite microspheres via pseudo-multicomponent heterophase polymerization and the potential application on Cr(VI) removal

Co-reporter:Fengdan Hu, Longhai Guo, Teng Qiu and Xiaoyu Li

RSC Advances 2016 vol. 6(Issue 52) pp:46900-46907

Publication Date(Web):03 May 2016

DOI:10.1039/C6RA06498A

Polypyrrole–polystyrene (PPy–PS) composite hollow microspheres with a dry-plum-like morphology were prepared via pseudo-multicomponent heterophase polymerization in an aqueous dispersion system. The monomers of pyrrole (Py) and styrene (St) were simultaneously added into the reactor with the existence of azodiisobutyronitrile. The oxidization polymerization of Py was first initiated by the addition of ammonium persulfate, and the radical polymerization of St was subsequently initiated by the elevated temperature. Finally, composite micron-sized spheres were obtained with hierarchical structures. The microspheres are hollow inside, with PPy nano-particles bound by a PS matrix for the building of the wall-shell. The decoration of tiny PPy particles at the surface leads the microspheres to be an effective adsorbent to isolate Cr(VI) ions from water. The adsorption kinetics and isotherm result of the microspheres agree well with the pseudo-second-order rate model and Langmuir isotherm mode, respectively.

The aminolysis of styrene–maleic anhydride copolymers for a new modifier used in urea-formaldehyde resins

Co-reporter:Hongyun Duan, Teng Qiu, Longhai Guo, Jun Ye, Yang Yuan, Xiaoyu Li

International Journal of Adhesion and Adhesives 2016 Volume 66() pp:138-146

Publication Date(Web):April 2016

DOI:10.1016/j.ijadhadh.2016.01.003

Styrene (St) and maleic anhydride (MA) alternating copolymers with different molecular weights (MW) were synthesized via radical copolymerization. The copolymers were subsequently transferred into water-soluble maleic amic acid derivatives (SMAA) via the aminolysis of anhydride groups using (NH4)2CO3 as the ammonia sources. The synthesized polymers were applied as a new kind of macromolecular modifier and added into the reaction system during the synthesis of urea-formaldehyde (UF) resins via the traditional alkaline–acidic–alkaline three-step process. The UF resins modified with SMAA were characterized using Fourier Transform Infrared Spectroscopy (FT-IR), 13C nuclear magnetic resonance (13C-NMR) spectroscopy, and thermal gravimetric analysis (TGA). All the results confirmed the successful incorporation of SMAA chains into the crosslinking network of the UF resins. The modified UF resins were further employed as wood adhesives and the effect of synthesis parameters on their performance was investigated. Meanwhile, the influence of SMAA molecular weight (MW) on the properties of the modified UF resins was also studied. When the UF resins were synthesized with a low molar ratio of formaldehyde/urea (F/U) and a predetermined amount of SMAA added into the reaction system at the second step, plywood bonded using these modified UF resins showed much improved bonding strength (BS) and depressed formaldehyde emission. Moreover, the as-modified UF resins showed good storage characteristics.

Waterborne POSS-silane-urethane hybrid polymer and the fluorinated films

Co-reporter:Siyu Chen, Longhai Guo, Dianxin Du, Jianling Rui, Teng Qiu, Jun Ye, Xiaoyu Li

Polymer 2016 Volume 103() pp:27-35

Publication Date(Web):26 October 2016

DOI:10.1016/j.polymer.2016.09.034

•A co-endcapping strategy is designed to monofunctional POSS modified waterborne PU.•A feasible method is proposed to fluoro-POSS-PU ternary hybrid films.•Physical X-links of POSS is found upon the chemical X-linking of alkyloxysilanes.•Notable performance improvement is achieved by the synergistic modification.•The synthesis and the application is toward the eco-friendly waterborne systems.A feasible co-endcapping strategy has been developed for the synthesis of monofunctional polyhedral oligomeric silsesquioxanes (POSS) modified waterborne polyurethane (WPU). The work starts from the synthesis of di-isocyanate terminated PU prepolymer from isophorone di-isocyanate (IPDI), poly (1,4-butylene adipate) end-capped diol (PBAD), and 2,2-bis(hydroxymethyl) butyric acid (DMBA). The two kinds of modifiers of monofunctional aminopropyl isobutyl POSS (AIPOSS) and with (3-aminopropyl) triethoxysilane (APTES) were used together to block the PU chains. The hybrid dispersions of curable silane-co-modified WPU with 2–8 wt% of AIRPOSS could form continuous and homogenous films under ambient conditions. The morphology and structure of the dispersed particles and the films were characterized, as well as the mechanical property and surface performance. The results indicate that the incorporation of POSS moieties into the silane-modified PU can significantly improve the mechanical property of the films and the formation of additional physical crosslinking points upon the chemical crosslinking networks. Moreover, both the surface hydrophobicity and the dielectric performance have been promoted by the incorporation of POSS. Furthermore, fluorinated groups were introduced on the films by the treatment of the fluorosilane coupling agent. The fluoro-POSS-PU hybrid films exhibit notable surface hydrophobicity as well as low dielectric constant and loss.

The atmospheric pressure synthesis of TiO2@carbon nanocomposite microspheres and the enhanced photocatalytic performance

Co-reporter:Hongyun Duan, Teng Qiu, Zaiwei Zhang, Longhai Guo, Jun Ye, Xiaoyu Li

Materials Letters 2015 Volume 153() pp:51-54

Publication Date(Web):15 August 2015

DOI:10.1016/j.matlet.2015.04.007

•TiO2@Carbon nanocomposite microspheres were prepared via a facile atmospheric pressure synthesis.•Organic and inorganic sol–gel reactions were combined in one-pot.•Post-carbonization produced porous RF-Carbon loaded with well crystalline anatase TiO2.•TiO2@Carbon showed excellent photoactivity on catalytic degradation of water pollutants.Herein, we report a facile synthesis of nano-TiO2@carbon microspheres (TiO2@C) with enhanced photocatalytic performances. The spherical resorcinol–formaldehyde (RF) hydrogels were firstly prepared and then in-situ loaded with TiO2 via a one-pot protocol. The target products were obtained after the composite hydrogels were carbonized at high temperatures. The whole protocol was carried out under atmospheric pressure in no need of special high pressures. The as-prepared TiO2@C is unique, which is characterized by the well-controlled sub-micron morphology, highly crystalline anatase nano-TiO2, and the hierarchically micro–mesoporous structure. The composite spheres could be applied as a new kind of photocatalyst, and the excellent performance was evaluated in the photodegradation of chlorobenzene in water. The enhanced photocatalytic activity of TiO2@C could be explained by the synergistic effect of the RF–C supporting with the anatase nano-TiO2.

Miniemulsion polymerization of fluorinated siloxane-acrylate latex and the application as waterborne textile finishing agent

Co-reporter:Longhai Guo;Sijiu Jiang;Shengwen Zhang;Lifan He;Jie Tan ;Xiaoyu Li

Journal of Applied Polymer Science 2014 Volume 131( Issue 8) pp:

Publication Date(Web):

DOI:10.1002/app.40162

ABSTRACT

Fluorinated siloxane–acrylate polymer latex was synthesized via miniemulsion polymerization, which was carried out by pseudo one-step method. In the synthesis protocol, the monomers of octamethylclotetrasiloxane (D₄), tetravinyltetramethylcyclotetrasiloxane (D₄^v), methyl methylacrylate, butyl acrylate, N-methylol acrylamide, and dodecafluoroheptyl methacrylate (DFMA) were first mixed and homogenized into a miniemulsion, which was stabilized by dedecybenzene sulfonic acid. The ring-opening polymerization of cyclosiloxane was then steadily performed under miniemulsion conditions and followed by the postaddition of radical initiators to initiate the polymerization of acrylate and DFMA monomers. The influences on the emulsion properties by acrylic monomer with different addition protocol were investigated in this work. In addition, the synthesized latexes were characterized by using dynamic laser scattering, transmission electron microscope, differential scanning calorimetry, and Fourier transform infrared spectroscopy. These results indicated that the introduction of D₄^v in the latex can successfully suppress the phase separation between the thermodynamically incompatible components for the formation of uniform hybrid latex particles. The further application of the as-synthesized latex was investigated as a new kind of waterborne textile finishing agent. Moreover, the influences of the content of D₄^v and DFMA on the finishing properties, especially for the softness, the water repellence, and the antimoisture properties, were systematically studied in this work. With a proper design on the content of the D₄^v and DFMA, stable textile finishing emulsion was prepared, which can endow the fabric both desirable softness and excellent water resistances. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40161.

One-pot synthesis of poly(methacrylic acid)-b-poly(2,2,2-trifluoroethyl methacrylate) diblock copolymers via RAFT polymerization

Co-reporter:Longhai Guo, Yongjing Jiang, Teng Qiu, Yan Meng, Xiaoyu Li

Polymer 2014 Volume 55(Issue 18) pp:4601-4610

Publication Date(Web):2 September 2014

DOI:10.1016/j.polymer.2014.07.018

In this work, the reversible addition-fragmentation chain transfer (RAFT) polymerization was utilized to synthesize the amphiphilic diblock copolymers of poly(methacrylic acid)-b-poly(2,2,2-trifluoroethyl methacrylate) (PMAA-b-PTFEMA) via one-pot two-step reaction protocol. The controlled radical polymerization of MAA monomer was first carried out in pure water by using 4-cyanopentanoic acid dithiobenzoate (CADB) as chain transfer agent. Subsequently, the as-synthesized PMAA homopolymers with dithiobenzoate end-groups were employed as macro-CTA and chain-extended in situ with the hydrophobic TFEMA monomer. The reactions were carried out in 1,4-dioxane/water medium. Both the polymerization of PMAA and PTFEMA blocks showed the well controllability on the molecular weighs and distributions. It was found that the amphiphilic diblock copolymers formed the stable spherical particles via the polymerization-induced self-assembly. Meanwhile, the effect of various parameters, such as the concentration ratio of TFEMA monomer over PMAA macro-CTA, the solvent condition (different ratio of 1,4-dixane/water), and the pH, on the RAFT polymerization of TFEMA monomer were investigated in detail. Their kinetic results suggested that the propagation of TFEMA monomer on the macro-CTA was performed at the particle/water interfaces. The concentration of chain transfer agents at the interfaces determined the polymerization rate. Finally, the stability of the fluorinated polymer dispersions was also evaluated in this work.

Self-Assembly of Poly(methacrylic acid)-b-poly(butyl acrylate) Amphiphilic Block Copolymers in Methanol via RAFT Polymerization and during Film Formation for Wrinkly Surface Pattern

Co-reporter:Longhai Guo, Yongjing Jiang, Siyu Chen, Teng Qiu, and Xiaoyu Li

Macromolecules 2014 Volume 47(Issue 1) pp:165-174

Publication Date(Web):December 27, 2013

DOI:10.1021/ma402167d

Reversible addition–fragmentation chain transfer (RAFT) dispersion polymerization was utilized to synthesize poly(methacrylic acid)-b-poly(butyl acrylate) (PMAA-b-PBA) amphiphilic block copolymer dispersions in methanol by using the PMAA homopolymer with dithiobenzoate end-group as macro-RAFT agent. And the PMAA macro-RAFT agent was synthesized first by using 4-cyanopentanoic acid dithiobenzoate (CADB) as RAFT agent, where the intermolecular hydrogen bondings can be formed between the MAA units. With the formation of solvophobic PBA block by propagating BA monomer on the PMAA homopolymer chain, the PMAA-b-PBA block copolymer in situ self-assembled into core/shell sphere with PBA and PMAA blocks as core and shell matrix, respectively. The repulsive steric interaction within the PMAA block on shell matrix stabilized the copolymer particles in methanol dispersion, which further resulted in the formation of wrinkly surface pattern on the PMAA-b-PBA copolymer film. During the film formation process, the core/shell copolymer particles were concentrated and then anisotropically aggregated with the evaporation of methanol. The aggregated copolymer particles further assembled into the fibrous structure, so that the film with wrinkly surface pattern was obtained. And the fibrous width and the amplitude of fluctuant film surface can be controlled by copolymer molecular structure and film casting temperature, which are synergetically governed by both the self-assembly of core/shell copolymer particles and the hydrogen-bonding network within the PMAA blocks.

Preparation and Electromagnetic Properties of Core/Shell Polystyrene@Polypyrrole@Nickel Composite Microspheres

Co-reporter:Wenzhe Li, Teng Qiu, Leilei Wang, Shanshan Ren, Jiangru Zhang, Lifan He, and Xiaoyu Li

ACS Applied Materials & Interfaces 2013 Volume 5(Issue 3) pp:883

Publication Date(Web):December 31, 2012

DOI:10.1021/am302551d

Through a novel method, we successfully synthesized electromagnetic (EM) functional polystyrene@polypyrrole@nickel (PS@PPy@Ni) composite microspheres. The PS@PPy spheres with well-defined core/shell structure have been synthesized via an in situ chemical oxidative copolymerization of pyrrole (Py) and N-2-carboxyethylpyrrole (PyCOOH) templated by PS microspheres. The reaction was carried out under heterophase conditions using the mixture of ethanol and water as the continuous phase. Tailored by the carboxyl groups on the surface of microspheres, magnetic nickel layer has been steady deposited onto the P(Py-PyCOOH) layer of the microspheres through an activation-electroless plating technology. The fine PS@P(Py-PyCOOH)@Ni core/shell structures could be obtained with the PyCOOH content up to 50 wt % in the P(Py-PyCOOH) layer. Moreover, the as-prepared PS@P(Py-PyCOOH)@Ni composites are ferromagnetic materials and behave as a good electromagnetic (EM) absorption material due to the coating of Ni layer around the PS@P(Py-PyCOOH) spheres. The PS@P(Py-PyCOOH)@Ni composite spheres show the remarkable EM wave absorption property with the maximum reflection loss (around −20.06 dB) at 10.69 GHz. The EM wave absorption can retained lower than −10 dB within a broad frequency range from 9.16 to 13.75 GHz.Keywords: core/shell; electromagnetic wave absorption; functional polymer microspheres; nickel; polypyrole;

Preparation and characterization of emulsifier-free polyphenylsilsesquioxane-poly (styrene–butyl acrylate) hybrid particles

Co-reporter:Ruiqin Bai, Teng Qiu, Feng Han, Lifan He, Xiaoyu Li

Applied Surface Science 2013 Volume 282() pp:231-235

Publication Date(Web):1 October 2013

DOI:10.1016/j.apsusc.2013.05.109

Highlights

•: Polyphenylsilsesquioxane latex particles were prepared.
•: Styrene and butyl acrylate grafted onto polysilsesquioxane.
•: The obtained hybrid latex particles had core–shell structure.
•: The hybrid latex film exhibited lower water uptake and higher pencil hardness.

Synthesis of poly(acrylate-styrene)/poly(acrylate-styrene) core/shell latex and TOPEM-DSC characterization

Co-reporter:Min Duan, Teng Qiu, Chen Huang, Guangyi Xu, Longhai Guo, Xiaoyu Li

Progress in Organic Coatings 2013 Volume 76(Issue 1) pp:216-223

Publication Date(Web):January 2013

DOI:10.1016/j.porgcoat.2012.09.019

Synthesis of Polystyrene/Polysilsesquioxane Core/Shell Composite Particles via Emulsion Polymerization in the Existence of Poly(γ-Methacryloxypropyl trimethoxysilane) Sol

Co-reporter:Shenglin Yang, Chunfeng Song, Teng Qiu, Longhai Guo, and Xiaoyu Li

Langmuir 2013 Volume 29(Issue 1) pp:92-101

Publication Date(Web):December 11, 2012

DOI:10.1021/la303813q

Here, we synthesized the polystyrene/polysilsesquioxane (PS/PSQ) core/shell latex particles via emulsion polymerization, which behave as an amusing morphology. First, the nanosized PSQ particles were prepared by the hydrolysis–condensation reaction of γ-methacryloxypropyl trimethoxysilane (MPTS) in ethanol medium. Subsequently, the as-obtained methacryloxypropylene functionalized PSQ (PMPTS) sol was directly added into the emulsion system of styrene (St) monomer, and PS/PSQ composite particles with core/shell structure were obtained through emulsion polymerization. We found that the structure of the composite particles can be affected by the synthesis parameters such as reaction time, content of PMPTS added in the reaction, amount of coemulsifier, and the pH value of emulsion system, which were systemically explored by transmission electron microscopy (TEM), scanning electron microscope (SEM), Fourier transform infrared (FTIR) spectroscopy, dynamic light scattering (DLS), and thermogravimetric analysis (TGA) in this work. These results indicate that the PMPTS particles in the size of about 5 nm could first absorb onto the surface of PS latex particles so as to assemble in a strawberry-like morphology. The further coalescence among the PMPTS particles would result in a continuous PMPTS shell around the PS core. Moreover, the hollow PSQ capsules were prepared after extraction of the PS core by organic solvent, further confirming the core/shell structure of the as-synthesized PS/PMPTS particles. Meanwhile, we also explored the application of the PS/PSQ core/shell particles as a new kind of Pickering emulsifier in the emulsion polymerization of St, and composite particles with complex patchy morphologies have been obtained finally under different ratios of styrene monomer to PS/PMPTS colloidal emulsifier.

The nucleation study on the cationic miniemulsion polymerization of octamethylcyclotetrasiloxane (D4)

Co-reporter:Sijiu Jiang;Lifan He;Jie Tan;Xiaoyu Li

Colloid and Polymer Science 2013 Volume 291( Issue 5) pp:1135-1142

Publication Date(Web):2013 May

DOI:10.1007/s00396-012-2841-5

The nucleation of the cationic miniemulsion polymerization of octamethylcyclotetrasiloxane (D4) has been investigated in detail in this work. The particle size was traced by dynamic laser scattering in the polymerization process using different concentration of dodecylbenzenesulfonic acid (DBSA) as both the initiator and surfactant. The results reveal the progressively decreasing particle sizes with the steadily increasing monomer conversion. The descending particle sizes can be explained by the existence of homogeneous nucleation of hydroxyl-terminated polydimethylsiloxane (PDMS) oligomers in addition to the primary droplet nucleation. A linear relationship between the natural logarithm of the average particle diameter (lnd(t)) and the natural logarithm of the monomer conversion (lnf(t)) is then deduced based on the theory, which has been validated by the experimental data. The slope of lnd(t)~lnf(t) line relies on the parameter of K which is the ratio of PDMS oligomers entering water phase to all PDMS oligomers produced. The influence of DBSA concentration on the K and the fraction of homogeneous nucleation (F(H)) has been then obtained. Both of the values of K and F(H) increase with the increasing DBSA concentrations.

The synthesis of Ag-polypyrrole nanocomposite coated latex particles and their application as a fluorescent quenching agent

Co-reporter:Jiang-ru Zhang 邱藤;Hong-fu Yuan

Chinese Journal of Polymer Science 2013 Volume 31( Issue 3) pp:434-443

Publication Date(Web):2013 March

DOI:10.1007/s10118-013-1229-4

Submicron-sized Ag-polypyrrole/poly(styrene-co-methacrylic acid) (Ag-PPy/P(St-co-MAA)) composite particles were fabricated via a redox reaction between pyrrole and AgNO3 in the presence of P(St-co-MAA) soap-free latex. The products are characterized by transmission electron microscopy (TEM), electron diffraction spectra (EDS), Raman spectra, thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The results showed that Ag-PPy nanocomposites were in situ deposited onto the surface of P(St-co-MAA) latex particles tailored by carboxylic-acid groups. The nanocomposites of Ag-PPy distributed on the surface of polymer particles transformed from discretely dots to continuously coating as the reaction temperature increased from 15°C to 60°C. Strawberry-like composite particles were obtained at the reaction temperature of 60°C. The TGA characterization confirmed that the Ag-PPy nanocomposites loading onto the P(St-co-MAA) particles were systematically controlled over a range of 6 wt%–42 wt% by changing the reaction temperatures. The fluorescence quenching effect of the Ag-PPy/P(St-co-MAA) composite particles was explored on Rhodamine B as a model molecule with the Stern-Völmer quenching constant KSV of 5.9 × 104 (g/mL)−1. It is suggested that the fluorescence quenching effect is caused by the resonance energy transfer mechanism.

Preparation and characterization of inorganic–organic trilayer core–shell polysilsesquioxane/polyacrylate/polydimethylsiloxane hybrid latex particles

Co-reporter:Ruiqin Bai, Teng Qiu, Feng Han, Lifan He, Xiaoyu Li

Applied Surface Science 2012 Volume 258(Issue 19) pp:7683-7688

Publication Date(Web):15 July 2012

DOI:10.1016/j.apsusc.2012.04.121

Abstract

The inorganic–organic trilayer core–shell polysilsesquioxane/polyacrylate/polydimethylsiloxane hybrid latex particles have been successfully prepared via seeded emulsion polymerization of acrylate monomers and octamethylcyclotetrasiloxane (D₄) gradually, using functional polymethacryloxypropylsilsesquioxane (PSQ) latex particles with reactive methacryloxypropyl groups synthesized by the hydrolysis and polycondensation of (3-methacryloxypropyl)trimethoxysilane in the presence of mixed emulsifiers as seeds. The FTIR spectra show that acrylate monomers and D₄ are effectively involved in the emulsion copolymerization and formed the polydimethylsiloxane-containing hybrid latex particles. Transmission electron microscopy (TEM) and dynamic light scattering (DLS) confirm that the resultant hybrid latex particles have evident trilayer core–shell structure and a narrow size distribution. XPS analysis also indicates that polysilsesquioxane/polyacrylate/polydimethylsiloxane hybrid latex particles have been successfully prepared and PDMS is rich in the surface of the hybrid latex film. Additionally, compared with the hybrid latex film without PDMS, the hybrid latex film containing PDMS shows higher hydrophobicity (water contact angle) and lower water absorption.

Simple synthesis of polypyrrole-polystyrene hybrid hollow spheres

Co-reporter:Jiangru Zhang, Teng Qiu, Shanshan Ren, Hongfu Yuan, Lifan He, Xiaoyu Li

Materials Chemistry and Physics 2012 Volume 134(2–3) pp:1072-1078

Publication Date(Web):15 June 2012

DOI:10.1016/j.matchemphys.2012.03.115

Herein polypyrrole-polystyrene (PPy-PS) hybrid hollow spheres have been prepared by a facile method. In the synthesis, pyrrole was oxidatively polymerized by FeCl3·6H2O in an emulsion of PS latex. The produced PPy deposited onto the surface of the PS particles, which were “dissolved” during the polymerization for the in-situ formation of hollow PPy spheres. The morphology of the hollow spheres was characterized by transmission electron microscope (TEM) and scanning electron microscopy (SEM). The size and size distribution of the hollow spheres were totally depended on that of the PS latex particles which can be adjusted conveniently. The PPy-PS hybrid structure of the shell of the hollow spheres was characterized by selective extraction using tetrahydrofuran (THF) and Fourier transform infrared (FTIR) spectroscopy. The formation process of the hollow spheres was traced by TEM. The probable mechanism for the formation of hollow spheres was also proposed in this work. The influences of the reaction conditions on the formation of the hollow structures have been studied in detail.Graphical abstractHighlights► PPy-PS hybrid hollow spheres were prepared by a novel facile method. ► Oxidative polymerization of pyrrole was carried out in common PS latex emulsion. ► No template remove process was needed. ► The size of hollow voids can be adjusted by changing the diameter of PS latex. ► The formation mechanism of PPy-PS hollow spheres was proposed.

Synthesis and characterization of core–shell polysilsesquioxane-poly(styrene-butyl acrylate-fluorinated acrylate) hybrid latex particles

Co-reporter:Ruiqin Bai, Teng Qiu, Min Duan, Guiling Ma, Lifan He, Xiaoyu Li

Colloids and Surfaces A: Physicochemical and Engineering Aspects 2012 Volume 396() pp:251-257

Publication Date(Web):20 February 2012

DOI:10.1016/j.colsurfa.2012.01.003

Core–shell polysilsesquioxane-poly(styrene-butyl acrylate-fluorinated acrylate) [PSQ–P(St-BA-FA)] hybrid latex particles were successfully prepared by seeded emulsion polymerization with polymethacryloxypropylsilsesquioxane (PSQ) synthesized by the hydrolysis and polycondensation of (3-methacryloxypropyl)trimethoxysilane (MAPTS) in the presence of emulsifiers as seeds. The chemical composition and core–shell morphology of the resultant hybrid particles were investigated by Fourier transform infrared (FTIR) spectroscopy and transmission electron microscopy (TEM), respectively. TEM and dynamic light scattering (DLS) analysis indicated that the core–shell hybrid particles were uniform and possessed narrow size distributions. The surface properties of the latex films produced from the core–shell hybrid particles were also investigated by contact angle (CA) analysis and X-ray photoelectron spectroscopy (XPS) analysis. The results proved the enrichment of fluorine on the film surface, and the latex films had high contact angles and low surface free energies. Optical measurements indicated that the incorporation of fluorinated acrylate onto PSQ particles can effectively reduce light reflectivity of the obtained transparent hybrid latex film. Atom force microscopy (AFM) characterization showed that the obtained hybrid latex film had a smooth surface. Additionally, thermogravimetric analysis (TGA) indicated that the PSQ–P(St-BA-FA) hybrid latex film had better thermal stability than the poly(styrene-butyl acrylate) [P(St-BA)] latex film.Graphical abstractHighlights► Functional polysilsesquioxane latex particles were prepared. ► Styrene, butyl acrylate and fluorinate acrylate grafted onto polysilsesquioxane. ► The obtained hybrid latex particles had core–shell structure. ► The hybrid latex film exhibited high hydrophobicity and thermal stability. ► The hybrid latex film exhibited low surface free energy and reflectivity.

Synthesis and characterization of emulsifier-free trilayer core–shell polysilsesquioxane/polyacrylate/poly(fluorinated acrylate) hybrid latex particles

Co-reporter:Ruiqin Bai;Cheng Xu;Lifan He;Xiaoyu Li

Colloid and Polymer Science 2012 Volume 290( Issue 9) pp:769-776

Publication Date(Web):2012 June

DOI:10.1007/s00396-011-2583-9

The trilayer core–shell polysilsesquioxane/polyacrylate/poly(fluorinated acrylate) (PSQ/PA/PFA) hybrid latex particles are successfully prepared, using functional PSQ latex particles with reactive methacryloxypropyl groups synthesized by the hydrolysis and polycondensation of (3-methacryloxypropyl)trimethoxysilane in the presence of a reactive emulsifier as seeds. Transmission electron microscopy (TEM), scanning electron microscopy (SEM) and dynamic light scattering (DLS) confirm that the resultant hybrid latex particles have evident trilayer core–shell structure and a narrow size distribution. The Fourier transform infrared (FTIR) spectra show that fluorinated acrylate monomers are effectively involved in the emulsion copolymerization and formed the fluorine-containing hybrid latex particles. XPS analysis of the obtained hybrid latex film reveals that the intensity of fluorine signal in the film–air interface is higher than that in the film–glass interface. In addition, compared with pure polyacrylate latex film, the obtained fluorine-containing hybrid film shows higher hydrophobicity and thermal stability, and lower surface free energy.

Dynamic mechanical study on multilayer core–shell latex for damping applications

Co-reporter:Cheng Xu, Teng Qiu, Jianqing Deng, Yan Meng, Lifan He, Xiaoyu Li

Progress in Organic Coatings 2012 74(1) pp: 233-239

Publication Date(Web):

DOI:10.1016/j.porgcoat.2011.12.014

Layer-by-Layer Synthesis of Multilayer Core−Shell Latex and the Film Formation Properties

Co-reporter:Yuanchun Mu, Teng Qiu, Xiaochen Li, Yidan Guan, Shengwen Zhang, and Xiaoyu Li

Langmuir 2011 Volume 27(Issue 8) pp:4968-4978

Publication Date(Web):March 22, 2011

DOI:10.1021/la104862h

Polymer latex particles were synthesized with multilayer core−shell structure via surface cross-linking emulsion polymerization. The latex core is coated with a five-layer shell. The polymerization was done in a semicontinuous fashion monitored by a dynamic laser scattering (DLS). The copolymer in each layer is designed with alternating high and low glass transition temperature (Tg). Divinylbenzene (DVB) was added as the cross-linking agent in the synthesis of the “hard” layers to prevent the molecular diffusion from the adjacent “soft” layers. The layer-by-layer increment on the latex core is proved by the alternating changes on the film-formation capabilities of different latex emulsions at room temperature in correspondence with the variance in the Tg of the outermost polymer layer. The detailed morphologies of the films formed by the latex with different number of layers were characterized by atom force microscopy (AFM). The deformation of the latex particles is largely depended on the nature of the polymer in the outermost layer of the latex particles. Further characterization carried out by multifrequency temperature-modulated differential scanning calorimetry (TOPEM-DSC) confirmed the layer-by-layer structure of the particles, although the molecular redistribution and the interlayer structures were observed. The work provides a routine toward the synthesis of multilayer polymer latexes.