Co-reporter:Shuai Sun, Lipeng Wang, Pingan Song, Liping Ding, Yongping Bai
Chemical Engineering Journal 2017 Volume 328(Volume 328) pp:
Publication Date(Web):15 November 2017
DOI:10.1016/j.cej.2017.07.070
•LDH can considerably enhance hydrolysis resistance of the phosphite antioxidants.•Hybridized phosphite antioxidants enhance optical transmittances of optical PET.•Hybridized phosphite antioxidants improve antioxidation performances of optical PET.•The chromaticity of as-created optical PET films is prominently enhanced.Phosphite antioxidants are extensively used in polyester industry due to extraordinary antioxidative and chromaticity protection capabilities. Unfortunately, they are highly susceptible to hydrolysis leading to reduced antioxidative activity, which remains unsatisfactorily addressed so far. In this work, we have demonstrated the fabrication of hydrolysis resistant hybridized phosphite antioxidants (PSLDH) by physically melt-blending with layered double hydroxides (LDH) based on the hydrolysis mechanism. X-ray diffraction measurements indicate that basically phosphite antioxidants are physically hybridized with the LDH. Accelerated hydrolysis results show that as-fabricated hybridized phosphite antioxidants show much superior anti-hydrolysis capability to the unmodified counterpart because the basic LDH can neutralize the phosphoric acid created during hydrolysis, thus effectively prohibiting the self-catalytic effect. High performance optical poly(ethylene terephthalate) (PET) materials are then synthesized by in situ adding PSLDH in the polycondensation process. Only adding 0.05 wt% of the PSLDH containing 10 wt% of LDH can remarkably improve the anti-oxidative and chromaticity performances of the resultant PET. This work provides an innovative methodology for developing high-performance value-added chemical additives via facile physical hybridization.Download high-res image (116KB)Download full-size image
Co-reporter:Fuchen Zhang;Qiuxia Wang;Lipeng Wang
RSC Advances (2011-Present) 2017 vol. 7(Issue 35) pp:21780-21789
Publication Date(Web):2017/04/18
DOI:10.1039/C7RA01681F
Herein, poly(ethylene terephthalate-co-isophthalate) (PETI) was synthesized via an ethylene glycol stibium/γ-AlOOH composite catalyst and a study was carried out on the structural changes of the end groups of poly(ethylene terephthalate-co-isophthalate) (PETI). Based on this study, the effect of the structural changes of these end groups on the crystallization and optical properties of polyester has been discussed. Moreover, it was found that after the catalytic reaction, the γ-AlOOH and the carboxyl end groups of PETI generated terminal carboxyl aluminum coordination compounds. The composite catalyst generated alkoxy aluminum and alkoxy stibium. The strong nucleating ability of these new end group structures changed the crystallization properties of the polyester. Moreover, the optical properties of the polyester were affected and as a result, a 90.46% transmittance for PETI was observed.
Co-reporter:Lei Huang;Zuotao Lei;Tong Huang;Yongfeng Zhou
Nanoscale (2009-Present) 2017 vol. 9(Issue 6) pp:2145-2149
Publication Date(Web):2017/02/09
DOI:10.1039/C6NR09379E
This paper reports the aqueous self-assembly of giant elliptical platelets over 20 μm in axial length, from a novel polyamide. Both the self-assembly pathway and mechanism were studied using morphology and X-ray characterizations. The polymer first self-organizes into small quadrangular frustum pyramid platelets, and then these small platelets can be further installed into giant elliptical platelets through an “installation art”-like hierarchical self-assembly process driven by crystallization. The as-prepared regular giant platelets can further aggregate together into multi-horned or flower-like superstructures.
Co-reporter:Ning Li;Fanglei Zeng;Yu Wang;Dezhi Qu;Wenbo Hu;Yigang Luan;Shuai Dong;Jianjun Zhang
RSC Advances (2011-Present) 2017 vol. 7(Issue 49) pp:30970-30978
Publication Date(Web):2017/06/13
DOI:10.1039/C7RA04509C
Until now, only few hydroxy-terminated fluorinated monomers were reported as soft segment. In this work, based on a novel hydroxy-terminated liquid fluorine elastomer (LFH), a series of FPUs were synthesized via a two-step method. Flexible soft segment polytetrahydrofuran glycol (PTMG) was applied as the second soft segment. FTIR and GPC results indicated that the fluorinated groups were introduced into the structures of copolymers, and all the monomers were copolymerized successfully. TGA, DMTA and conventional mechanical analysis show that FPU gains optimal thermal stability and mechanical properties when the dosage of LFH is increased to a critical value of 18 wt%, even after the cured films being immersed into hot water and oil. Additionally, the surface properties of FPUs can be highly changed as a small amount of fluoride (6 wt%) is introduced into the structures of copolymers, due to the effect of fluorine enrichment. Consequently, LFH can effectively improve the thermal stability, mechanical properties, water resistance and organic solvent resistance of polyurethane within limits. Besides, these mentioned controllable properties of FPU can be achieved by changing the dosage of LFH. This work will help to achieve the best balance between performance and cost in industrial production.
Co-reporter:Shuai Sun;Yu Wang;Lipeng Wang;Liping Ding
Polymer Science, Series B 2017 Volume 59( Issue 5) pp:630-638
Publication Date(Web):25 October 2017
DOI:10.1134/S156009041705013X
In this paper, poly(ethylene terephthalate-co-isophthalate) was prepared and a series of PETI/SiO2 nanocomposites with different amounts of silica nanoparticles was synthesized by in situ polymerization. Optical properties of the resultant nanocomposites were investigated by WGW photoelectric haze meter and UV–Vis-NIR spectrophotometer. Chemical structure and its influence on spherulite size of nano-SiO2 were characterized by Fourier transformed infrared spectra and polarized optical microscopy, respectively. The differential scanning calorimetry results reveal that the addition of nano-SiO2 has an impact on the thermal performance of the nanocomposite. Different proportions of SiO2 were compared and the degree of crystallinity was found to have influence on optical properties of as-prepared nanocomposites. In addition, the results indicate that the low loading levels of SiO2 can improve the optical properties of the composite and an optimum content was selected. Possible reasons for this enhanced role might be the different combination structure of the nanocomposites when the amount of SiO2 varied.
Co-reporter:Fuchen Zhang, Hongjun Kang, Yongping Bai, Bo Jiang, Yudong Huang and Li Liu
RSC Advances 2016 vol. 6(Issue 72) pp:67677-67684
Publication Date(Web):06 Jul 2016
DOI:10.1039/C6RA09055A
In this paper, the hydrolysis process of aluminum subacetate (AlSA) was studied by Fourier transform infrared (FT-IR), 27Al nuclear magnetic resonance (NMR), X-ray diffraction (XRD), and particle size distribution analysis, and poly(ethylene terephthalate-co-isophthalate) (PETI) was synthesized by using a compound catalyst made of its hydrolysate, γ-AlOOH, and ethylene glycol stibium (EGSb). Meanwhile, the effects of the γ-AlOOH addition stage on the catalytic effect and the relative properties of the polyester were investigated. The results showed that the Sb and Al compound catalyst had obvious synergistic effects on the process of the polyester polycondensation. With the same dosage of catalyst, the usage of EGSb and the polycondensation time were reduced by 60% and 18.6%, respectively, and the diethylene glycol content in the polyester also decreased by using the compound catalyst, compared with that obtained when only using the EGSb catalyst. The use of γ-AlOOH could play a catalytic role and also shows a unique crosslinking center, which could improve the melting point and glass transition temperature.
Co-reporter:Yu Wang and Yongping Bai
RSC Advances 2016 vol. 6(Issue 59) pp:53730-53748
Publication Date(Web):23 May 2016
DOI:10.1039/C6RA05816G
This review seeks to give an overview of different approaches to prepare functional fluoroelastomers for modern industries. These approaches can be divided into three main families of alternatives. The first extensively describes the preparation of telechelic fluoroelastomers based on chemical degradation. Carboxyl-terminated fluoroelastomers are usually achieved via a typical degradation process, which then can be changed into various functional group-terminated fluoroelastomers. The second deals with functionalization of fluoroelastomers through grafting reactions. Conventional strategies, such as radical polymerization, dehydrofluorination and sulfonation, are used to graft single or faintness functional monomers onto fluoroelastomers. Reversible deactivation radical polymerization, however, provides quantitative copolymers containing unique functional groups. The third alternative route, namely functionalized copolymerization, concerns two main types: functionalization of an initiator and functionalization of monomers. In several cases, both will be utilized to synthesize special functional fluoroelastomers. In addition to the three approaches, the properties and applications of processed fluoroelastomers are illustrated to explore their functions and influences after functionalization.
Co-reporter:Lei Zhang;Yingjie Cao;Lei Wang;Lu Shao
Journal of Applied Polymer Science 2016 Volume 133( Issue 3) pp:
Publication Date(Web):
DOI:10.1002/app.42886
ABSTRACT
In the area of pressure sensitive adhesives (PSAs), corona treatment or other preprocessing on the carrier was commonly utilized for the enhancement of the interaction between the adhesive layer and the carrier, with complicated procedures and operations. To make it easy, one-pot emulsion polymerization using n-butyl acrylate, isobornyl methacrylate (IBOMA), 2-hydroxyethyl acrylate and acrylic acid was conducted in the presence of a reactive emulsifier SR-20 to obtain a reinforced adhesive tape. First, the emulsion had good stabilities, especially freeze-thaw stability, which was helpful to the fabrication of PSAs. Second, IBOMA increased the binding strength between adhesive layer and adherend. The properties of the final tapes well fulfilled the requirements of this areas, such as that the 180° peel strength of 125.9 N/m when coated on non-corona surfaces, the tack of 19 #, and the shear holding time of more than 100 h. Third, the tapes produced using the above emulsion could be removed many times, with no PSAs residue on the adherend even when coated on untreated PP, which showed the potential of recycling and environmental protection. Thus, these properties make the polyacrylate emulsion have great potential for practical applications. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 42886.
Co-reporter:Lipeng Wang, Fucheng Zhang, Yongping Bai, Liping Ding
Thermochimica Acta 2016 Volume 645() pp:43-49
Publication Date(Web):10 December 2016
DOI:10.1016/j.tca.2016.10.011
•A ionomer Poly (ethylene terephthalate -co-sodium-5-sulfo-iso-phthalate) was synthesized.•The non-isothermal kinetics of crystallization of PETI was investigated exhaustively using differential scanning calorimetry.•The non-isothermal kinetics of crystallization of PETI is very consistent with Avrami and Tobin model.The kinetic of non-isothermal crystallization of Poly (ethylene terephthalate-co-sodium-5-sulfo-iso-phthalate) (PETI) was investigated using differential scanning calorimetry (DSC). Various macrokinetic models namely the Avrami, Tobin, Ozawa, and Ziabicki were used to describe the non-isothermal crystallization process of PETI. Both of the Avrami crystallization rate constant and the Tobin crystallization rate constant were observed to increase with increasing cooling rate. The Avrami model is better than the Tobin model to describe the non-isothermal crystallization process of PETI. The Ozawa crystallization rate KO was found to decrease with increasing cooling rate, while Ziabicki’s kinetic crystallizability parameter GZ was found to increase with increasing cooling rate. The effective energy barrier △E for non-isothermal crystallization process of PETI, analyzed based on the differential iso-conversional method of Friedman, was found to be an increasing function of the relative crystallinity.
Co-reporter:Lei Zhang, Yingjie Cao, Lei Wang, Lu Shao and Yongping Bai
RSC Advances 2015 vol. 5(Issue 46) pp:36288-36294
Publication Date(Web):15 Apr 2015
DOI:10.1039/C5RA04971G
A novel porous adhesion material for digital inkjet printing with absorbency for eco-solvent ink and removable adhesion has been successfully prepared by a simple, robust and cost-effective method. There was no traditional emulsifier with low molecular weight adopted in the poly(n-butyl acrylates) emulsion for the preparation of the porous material. Due to the properties of this reactive emulsifier, there was no free emulsifier left after the polymerization, thereby reducing the drawbacks associated with traditional emulsifiers. The porous material possesses high shear strength, moderate peel strength and low tack properties suitable for adhesion and could be removable many times, which offered a new method for recycling. Since the novel porous material can be utilized many times and have potential for recycling, we believe that this material would be environmentally friendly. Additionally, the absorbency of the eco-solvent ink created a suitable platform for digital inkjet printing based on the novel porous material, with resistance to different atmospheres, like acid, base, oxidant, and many organic solvents.
Co-reporter:Liping Ding;Long Xie;Jianyun Cao
Journal of Applied Polymer Science 2015 Volume 132( Issue 31) pp:
Publication Date(Web):
DOI:10.1002/app.42308
ABSTRACT
A low crystallinity, the copolyester poly(ethylene terephthalate-co-neopentyl terephthalate-co-ethylene isophthalate-co-neopentyl isophthalate) (PENIT) was synthesized and applied for laminated tin-free steel. The structures and thermal properties of the copolyester were characterized by 1H-NMR, thermogravimetry analysis, differential scanning calorimetry, wide-angle X-ray diffraction, and polarized optical microscopy. Differential scanning calorimetry, wide-angle X-ray diffraction, and polarized optical microscopy results show that the crystallization ability of the copolyester decreased obviously. Meanwhile, the peel strength, crystallinity, and water-vapor permeability of the copolyester film were also measured at varied lamination temperatures. The result confirm that an improvement in the lamination temperature led to an increased ratio of amorphous PENIT to crystalline PENIT and decreased structural orientation, and the decrease in the structural orientation sped up the increase in the rate of water-vapor permeability. On the basis of the purpose of reducing a detrimental effect on the corrosion resistance caused by water permeation, a reasonable lamination temperature was selected. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42308.
Co-reporter:Tong Huang, Xiaohua Huang, Xiaoyi Sun, Yongfeng Zhou, Yongping Bai and Deyue Yan
Chemical Communications 2014 vol. 50(Issue 55) pp:7363-7366
Publication Date(Web):21 May 2014
DOI:10.1039/C4CC02520B
This study describes a new method to prepare monodisperse polystyrene (PS) colloidal nanoparticles with controlled size ranging from 60 nm to 140 nm by the direct polymerization of styrene and divinylbenzene inside the bilayers of the polydisperse hyperbranched polymer vesicles.
Co-reporter:Lei Zhang, Yingjie Cao, Lei Wang, Lu Shao and Yongping Bai
RSC Advances 2014 vol. 4(Issue 88) pp:47708-47713
Publication Date(Web):23 Sep 2014
DOI:10.1039/C4RA05923A
Pressure sensitive adhesives (PSAs) are materials that can adhere strongly to solid surfaces under a light contact pressure for a short time. Soap-free emulsion polymerization of 2-ethylhexyl acrylate and n-butyl acrylate has been performed in the presence of a reactive emulsifier SR-10 to obtain high adhesion properties of PSAs. The particle size distribution was quite narrow with an average diameter of 137 nm. The FT-IR spectrum showed that the CC bonds contained in the monomers disappeared during the reaction. The DSC result showed that all the monomers were well copolymerized. The 180° peel strength could reach 183.2 N m−1 when SR-10 was 2 wt% and the ratio of 2-EHA to BA was 4 to 1. The tack was 13 #. The shear holding time was more than 100 h. The removable PSA tapes produced from the resulting soap-free emulsion showed good adhesion properties and stabilities, which are suitable for practical applications.
Co-reporter:Liping Ding, Lipeng Wang, Lu Shao, Jianyun Cao and Yongping Bai
RSC Advances 2014 vol. 4(Issue 97) pp:54805-54809
Publication Date(Web):13 Oct 2014
DOI:10.1039/C4RA08933B
In moist environments biaxially-oriented corona-treated polyethylene terephthalate (BOPET) film undergoes a decay in surface energy with time. This decay is a significant and well-known problem and it considerably restricts the industrial application of BOPET film. In the present study the decay effect and the dynamics of corona-treated BOPET film in an aqueous environment have been studied using water contact angle and variable angle X-ray photoelectron spectroscopy (XPS) measurements. In addition the surface decay mechanism of the corona-treated BOPET film in aqueous environments was analyzed and a molecular moving model for the decay mechanism is proposed.
Co-reporter:Yongping Bai, Chun Zhang, Minrui Li, Wenwen Liu
International Journal of Adhesion and Adhesives 2014 Volume 48() pp:231-237
Publication Date(Web):January 2014
DOI:10.1016/j.ijadhadh.2013.09.037
Butyl acrylate (BA), methyl methacrylate (MMA), acrylic acid (AA) and acrylamide (AM) were successfully grafted onto chlorinated polypropylene (CPP) via the solution polymerization. Under the optimum conditions, graft ratio turned out to be 14.9% and the fastness reached 100%, which fully satisfy the requirements in the coating industry. This paper studied the various factors on the graft ratio and optimized the grafting process via the orthogonal experiments. The mechanism of graft polymerization was proposed based on the FT-IR and DSC results. The mechanism that grafted CPP (g-CPP) promotes the adhesion between polypropylene (PP) and the topcoat was discussed in accordance with the ESCA results. Compared with CPP, the rheological properties and thermal behaviors of g-CPP were improved dramatically. The processing parameters were demonstrated to have great influence on adhesion properties.
Co-reporter:Lei Zhang, Yingjie Cao, Su Wang, Zbigniew Czech, Lu Shao, Yongping Bai
International Journal of Adhesion and Adhesives 2013 Volume 47() pp:69-72
Publication Date(Web):December 2013
DOI:10.1016/j.ijadhadh.2013.09.038
Pressure sensitive adhesives (PSAs) are the adhesive materials that can provide strong adhesion to solid surfaces under a light contact pressure for a short time. A novel microemulsion polymerization was established to obtain high adhesion properties of PSA on the basis of poly (n-butyl acrylates) (PBA). Stable PBA microemulsion with high solids content had been synthesized. Z-average size could be smaller than 20 nm with anionic emulsifier N4SES-AQ. FT-IR spectra showed that the C=C contained in monomers had gone through a reaction. The result of DSC testing showed that n-butyl acrylate (BA) and acrylic acid (AA) were well copolymerized. A good adhesion performance can be reached when N4SES-AQ is 0.5 wt% and 180° peel strength could reach 680.1 N/m. The PSA tapes produced from the resulting PBA microemulsion showed adhesion properties suitable for practical applications.
Co-reporter:Tong Huang, Xiaohua Huang, Xiaoyi Sun, Yongfeng Zhou, Yongping Bai and Deyue Yan
Chemical Communications 2014 - vol. 50(Issue 55) pp:NaN7366-7366
Publication Date(Web):2014/05/21
DOI:10.1039/C4CC02520B
This study describes a new method to prepare monodisperse polystyrene (PS) colloidal nanoparticles with controlled size ranging from 60 nm to 140 nm by the direct polymerization of styrene and divinylbenzene inside the bilayers of the polydisperse hyperbranched polymer vesicles.
