Fengling Bian

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Name: 卞凤玲; Bian, FengLing

Organization: Lanzhou University , China

Department: College of Chemistry and Chemical Engineering

Title: Associate Professor(PhD)

TOPICS

Polymer

Chemicals
References

Facile fabrication of porous oil-absorbent microspheres with high oil absorbency and fast oil absorption speed

Co-reporter:Yajing Duan;Hongjun Huang

Polymers for Advanced Technologies 2016 Volume 27( Issue 2) pp:228-234

Publication Date(Web):

DOI:10.1002/pat.3625

A novel type of porous oil-absorbent microspheres based on poly(stearyl methacrylate-co-butyl acrylate) was prepared via suspension polymerization. By investigating the effects of the cross-linking agent, monomer ratio, initiator, stabilizer, water/oil ratio, and porogen agent on the oil absorbency of the prepared oil-absorbents, an optimized oil-absorbent microsphere OAM-T was obtained, and characterized by FT-IR and SEM. The oil absorbencies of OAM-T toward chloroform, toluene, gasoline, and diesel were measured to be 61.9, 32.6, 28.8, and 28.2 g/g respectively, with oil absorption saturation time being 1.0, 1.5, 2.0, and 3.0 hr. The oil retention of OAM-T toward the four oils is all above 95%. Besides in pure oils, OAM-T also has high oil absorbencies in oil–water mixture. It can be reused at least 12 times with little change in oil absorbency. Owing to its excellent oil absorption performance, OAM-T might find applications for removing oil spills and organic pollutants from water. Copyright © 2015 John Wiley & Sons, Ltd.

Preparation of arginine modified PEI-conjugated chitosan copolymer for DNA delivery

Co-reporter:Xi Zhang, Yajing Duan, Dongfang Wang, Fengling Bian

Carbohydrate Polymers 2015 Volume 122() pp:53-59

Publication Date(Web):20 May 2015

DOI:10.1016/j.carbpol.2014.12.054

•Arginine modified polyethylenimine-conjugated chitosan (CS-PEI-Arg) was prepared successfully as a potential gene vector.•CS-PEI-Arg showed good DNA binding capacity and formed complexes with DNA at sizes less than 200 nm.•CS-PEI-Arg had significant lower cytotoxicity than CS-PEI and PEI (25 kDa).•The best transfection efficiency of CS-PEI-Arg (N/P = 50) is 2.3-fold, 4.2-fold of those of CS-PEI (N/P = 20) and PEI's (N/P = 10) efficiency respectively.Polyethylenimine-conjugated chitosan (CS-PEI) and arginine modified polyethylenimine-conjugated chitosan (CS-PEI-Arg) were prepared, and the copolymers were characterized by FTIR, 1H NMR, and XRD. The properties of these copolymers like plasmid DNA (pDNA) binding capacity, complexes’ size and zeta potential, cytotoxicity and transfection efficiency were also evaluated. The results show that CS-PEI-Arg derivatives can bind pDNA thoroughly, and form complexes with sizes about 170 nm. Cytotoxicity assay in HepG2 and 293 T cells show that CS-PEI-Arg has lower cytotoxicity compared with CS-PEI, which is similar to CS and far below that of PEI. In vitro luciferase assay show that CS-PEI-Arg has better transfection efficiency than CS-PEI, which is superior to that of PEI. The best transfection efficiency of CS-PEI-Arg (N/P = 50) is 2.3-fold, 4.2-fold of those of CS-PEI (N/P = 20) and PEI's (N/P = 10) efficiency respectively. These results display that CS-PEI-Arg is a promising candidate as an efficient gene vector.

Magnetic polymer nanocomposite-supported Pd: an efficient and reusable catalyst for the Heck and Suzuki reactions in water

Co-reporter:Dongfang Wang, Wendong Liu, Fengling Bian and Wei Yu

New Journal of Chemistry 2015 vol. 39(Issue 3) pp:2052-2059

Publication Date(Web):07 Jan 2015

DOI:10.1039/C4NJ01581A

A novel type of magnetically responsive polymer nanocomposite Fe3O4@poly(undecylenic acid-co-4-vinyl pyridine-co-sodium acrylate) (Fe3O4@PUVS) was synthesized by the free radical polymerization of 4-vinyl pyridine (4-VP) with sodium acrylate (SAA) and Fe3O4@undecylenic acid. Pd2+ was then immobilized on this magnetic nanocomposite to form the magnetic Fe3O4@PUVS-Pd catalyst. This catalyst exhibited excellent catalytic activity for the Heck and Suzuki coupling reactions in water, and could be simply separated by using a permanent magnet. The supported catalyst could be used consecutively for six runs without significant loss of catalytic activity.

Palladium supported on poly (ionic liquid) entrapped magnetic nanoparticles as a highly efficient and reusable catalyst for the solvent-free Heck reaction

Co-reporter:Wendong Liu, Dongfang Wang, Yajing Duan, Yahui Zhang, Fengling Bian

Tetrahedron Letters 2015 Volume 56(Issue 14) pp:1784-1789

Publication Date(Web):1 April 2015

DOI:10.1016/j.tetlet.2015.02.047

A novel palladium catalyst supported on poly (1-aminoethyl-3-vinylimidazolium bromide) entrapped magnetic nanoparticles (Pd/Fe3O4@PIL-NH2) was prepared. The catalyst was characterized by TEM, FT-IR, VSM, XRD, and XPS. The Pd loading on the catalyst was 0.23 wt % as measured by AAS. The catalyst showed excellent activity for the solvent-free Heck reaction. In addition, this novel Pd catalyst could be simply recovered with an external magnet and run five times with excellent yields achieved.

Synthesis and characterization of PEG-conjugated quaternized chitosan and its application as a gene vector

Co-reporter:Xi Zhang, Juan Yao, Lihong Zhang, Jianguo Fang, Fengling Bian

Carbohydrate Polymers 2014 Volume 103() pp:566-572

Publication Date(Web):15 March 2014

DOI:10.1016/j.carbpol.2013.12.072

•PEG-conjugated quaternized chitosan (PHTAC) was prepared as a potential gene vector.•PHTAC showed good DNA binding capacity and formed complexes with DNA about 200 nm.•Compared with quaternized chitosan, PHTAC showed significantly lower cytotoxicity.•PHTAC-1 had 5.3-fold higher transfection efficiency than quaternized chitosan.Poly(ethylene glycol)-conjugated N-(2-hydroxy) propyl-3-trimethyl ammonium chitosan chloride (PHTAC) derivatives were prepared by incorporating PEG molecules onto quaternized chitosan backbone. The copolymers were characterized by FTIR, 1H NMR and XRD. Agarose gel retardation assay indicated that PHTAC had good plasmid DNA (pDNA) binding capability and the particle sizes of PHTAC/pDNA complexes determined by DLS were about 200 nm. Cytotoxicity assays in HeLa and 293T cells showed that PHTAC had low cytotoxicity. In vitro luciferase assay showed that PHTAC with PEGylation degree of 9% (PHTAC-1) had good transfection efficiency about 5.3-fold higher than quaternized chitosan, which was comparable with PEI (25 kDa). These results suggest that PHTAC-1 is a promising candidate as an efficient nonviral gene vector.

A new recoverable Au(III) catalyst supported on magnetic polymer nanocomposite for aromatic bromination

Co-reporter:Bai Li, Linfeng Gao, Fengling Bian, Wei Yu

Tetrahedron Letters 2013 Volume 54(Issue 9) pp:1063-1066

Publication Date(Web):27 February 2013

DOI:10.1016/j.tetlet.2012.12.017

This Letter presents a facile alternative synthesis of a recoverable Au(III) catalyst supported on Fe3O4@SiO2∼MPS grafted by poly(N-vinyl-2-pyrrolidone) (PVP). The solid magnetic support was prepared by anchoring 3-methacryloxypropyltrimethoxysilane (MPS) onto the Fe3O4@SiO2 surfaces followed by free radical polymerization with N-vinyl-2-pyrrolidone. Au(III) was immobilized onto the magnetic support in aqueous media to afford Au(III)/Fe3O4@SiO2∼PVP (catalyst 1). Catalyst 1 was characterized by FT-IR, TEM, VSM, TGA, XRD, and ICP-AES. The amount of Au in catalyst 1 was measured to be 0.64 wt % by ICP-AES. This newly prepared catalyst can catalyze the aromatic bromination reaction with comparable activity as homogeneous AuCl3. Moreover, the supported catalyst is easy to recover and can be used in four cycles without apparent loss of activity.

Chelidamic acid functionalized stimuli-responsive hydrogel supported-palladium catalyst for copper-free Sonogashira reaction in aqueous media

Co-reporter:Jianhua Yang, Xi Zhang, Wei Yu, Weijie Liu, Fengling Bian

Reactive and Functional Polymers 2013 73(5) pp: 710-718

Publication Date(Web):May 2013

DOI:10.1016/j.reactfunctpolym.2013.02.007

The Reaction of Tertiary Anilines with Maleimides under Visible Light Redox Catalysis

Co-reporter:Xuhui Ju;Dianjun Li;Weifei Li;Wei Yu

Advanced Synthesis & Catalysis 2012 Volume 354( Issue 18) pp:3561-3567

Publication Date(Web):

DOI:10.1002/adsc.201200608

Abstract

Tertiary anilines can be prompted to react with N-aryl- and N-benzylmaleimides to form tetrahydroquinoline products under photocatalysis using visible light irradiation, the ruthenium or iridium complexes Ru(bpy)₃Cl₂ or Ir(ppy)₂(dtbbpy)PF₆ as catalyst, and air as terminal oxidant.

Synthesis and characterization of multiple cross-linking UV-curable waterborne polyurethane dispersions

Co-reporter:Zong Niu

Iranian Polymer Journal 2012 Volume 21( Issue 4) pp:221-228

Publication Date(Web):2012 April

DOI:10.1007/s13726-012-0021-6

A series of multiple cross-linking ultraviolet (UV) curable waterborne polyurethane dispersions (UV-PUDs) were synthesized by modification of diglycidyl ether of bisphenol-A-based epoxy resin (E51) through ring-opening by 3-aminpropyltriethoxysilane (APTES). Initially, APTES-E51 was synthesized using APTES to open the epoxy groups of E51. Then, APTES-E51 was incorporated into the chains of polyurethane, and multiple cross-linking UV-PUDs were produced. The chemical structures were confirmed by the Fourier-transform infrared spectroscopy (FTIR) and the effect of the APTES-E51 content on the UV-PUDs properties was investigated. The average particle size of UV-PUDs was determined by dynamic light scattering (DLS). The result showed that the average particle size increased with increasing APTES-E51 content and the stability of the UV-PUD storage diminished when the content of APTES-E51 was 10.0%. After modification by APTES-E51, the water absorption of the UV-cured films decreased and the water contact angle (CA) increased significantly. Thermogravimetry analysis (TGA) of the UV-cured films illustrated that APTES-E51 modified UV-curable waterborne polyurethane could exhibit good thermal stability. In addition, mechanical property of the cured films showed that the incorporation of APTES-E51 also improved tensile strength of the cured films. We can obtain good storage stability, satisfied water resistance, and high thermal stability and tensile strength when the APTES-E51 content of the UV-PUD was 9.1%.

A novel thermo and pH-double sensitive hydrogel immobilized Pd catalyst for Heck and Suzuki reactions in aqueous media

Co-reporter:Yaying Zhang, Jianhua Yang, Xi Zhang, Fengling Bian, Wei Yu

Reactive and Functional Polymers 2012 72(4) pp: 233-241

Publication Date(Web):April 2012

DOI:10.1016/j.reactfunctpolym.2012.02.010

Self-assembled micelles of N-phthaloylchitosan-g-polyvinylpyrrolidone for drug delivery

Co-reporter:Fengling Bian, Lixia Jia, Wei Yu, Mingzhu Liu

Carbohydrate Polymers 2009 Volume 76(Issue 3) pp:454-459

Publication Date(Web):9 April 2009

DOI:10.1016/j.carbpol.2008.11.008

A novel amphiphilic graft copolymer N-phthaloylchitosan-g-polyvinylpyrrolidone (PHCS-g-PVP) was synthesized by grafting polyvinylpyrrolidone (PVP) onto a chitosan derivative whose amino groups were protected by phthaloyl groups. Polymeric micelles were prepared by the dialysis method, and showed a low critical micelle concentration (CMC) of 0.83 mg/L detected by fluorescence spectroscopy. Prednisone acetate was incorporated in the polymeric micelles. The loading capacity was found to be around 44.6 wt%. Morphological investigation by transmission electron micrograph (TEM) showed that the micelles were round in shape. The mean particle diameter of the drug-loaded micelles were about 143.3 nm, much bigger than the unloaded micelles which had a unimodal size distribution with an average diameter of 89.8 nm as measured by dynamic light scattering (DLS). In vitro tests showed release of prednisone acetate from the micelles was continuous with no initial burst. All the results suggest that the nano-size core–shell micelles might be used in controlled drug delivery system.

Preparation and self-assembly behavior of thermosensitive polymeric micelles comprising poly(styrene-b-N,N-diethylacrylamide)

Co-reporter:Fengling Bian;Miao Xiang;Wei Yu ;Mingzhu Liu

Journal of Applied Polymer Science 2008 Volume 110( Issue 2) pp:900-907

Publication Date(Web):

DOI:10.1002/app.28635

Abstract

The amphiphilic block copolymer poly(styrene-b-N,N-diethylacrylamide) (PSt-b-PDEA) was synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization of styrene and N,N-diethylacrylamide. The results of ¹H-NMR and GPC analysis showed that the synthesized PSt-b-PDEA copolymer had controlled molecular weight and narrow polydispersity. Polymeric micelles having a unimodal size distribution with an average diameter of 40 ± 0.5 nm were obtained from purified PSt-b-PDEA using a dialysis method. And the results showed that the clearance of homopolymer in copolymer is the key to prepare the unimodal distribution core-shell nanomicelles. The micelles were thermodynamically stable in aqueous media with a low critical micelle concentration value (0.1 mg L⁻¹). The aqueous micelles solution underwent a reversible dispersion/aggregation transition at around 29°C, which corresponds to the lower critical solution temperature (LCST) of the outer shell PDEA block chains. It is hoped that with their unique characteristics, those thermoresponsive polymeric micelles would found application in drug delivery. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008