POLYMERS FOR ADVANCED TECHNOLOGIES
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2015
·Vol. 26
·期 11
·1306-1311
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IF 1.757
Deming Zeng,Jian Lv,Huashan Liu,Rui Du,Hui Lv,Chun Wei
In this paper, the effects of preparation methods on mechanical and tribological properties of sisal fiber cellulose microcrystalline (SFCM)/unsaturated polyester (UP) composites were studied. Compared with the pure UP composites, the SFCM/UP composites prepared by in-situ polymerization had greatly improved the mechanical and tribological properties. The impact strength, flexural strength, and flexural modulus of SFCM/UP composites with 2 wt% SFCM were 6.8 KJ/M 2 , 105.53 MPa, and 14.29 GPa, increased by 74.81%, 33.38%, and 7.36% in comparison with pure UP composites, respectively. Meanwhile, the volume wear rate of SFCM/UP composites at 100, 150, and 200°C decreased 50.40%, 52.39%, and 50.06%, respectively. These results suggested that the properties of SFCM/UP composites prepared by in-situ polymerization were significantly improved, which may be attributed to the strong interface interactions between SFCM and UP matrix. Copyright © 2015 John Wiley & Sons, Ltd.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
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2015
·Vol. 26
·期 6
·581-588
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IF 1.757
Tiantian Feng,Jun Wang,Hui Wang,Noureddine Ramdani,Liwu Zu,Wenbin Liu,Xiaodong Xu
A series of fluorene-based benzoxazine copolymers were synthesized from the mixture of 9,9-bis(4-hydroxyphenyl)fluorene and bisphenol A, and 4,4′-diaminodiphenyloxide and paraformaldehyde. And the cured polybenzoxazine films derived from these copolymers were also obtained. Fourier transform infrared spectroscopy (FTIR) and hydrogen nuclear magnetic resonances confirmed the structure of these benzoxazines. Their molecular weight was estimated by gel permeation chromatography. The curing behavior of the precursors was monitored by FTIR and differential scanning calorimetry. Dynamic mechanical analysis and thermogravimetric analysis were performed to study the thermal properties of the cured polymers. The cured polybenzoxazines exhibit excellent heat resistance with glass transition temperatures ( T g ) of 286–317°C, good thermal stability along with the values of 5% weight loss temperatures ( T 5 ) over 340°C, and high char yield over 50% at 800°C. The mechanical properties of the cured polymers were also measured by bending tests. Copyright © 2015 John Wiley & Sons, Ltd.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2015
·Vol. 27
·期 5
·591-596
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IF 1.757
Fen Ran,Haiming Song,Lang Ma,Xiaoqin Niu,Jiayu Wu,Weijie Zhang,Long Kang,Changsheng Zhao
Polyethersulfone (PES) membrane, one of the most important polymeric materials because of its good chemical resistance, thermal stability, mechanical, and film-forming properties, has already been used in hemodialysis, tissue engineering, and artificial organs. In order to improve the blood compatibility of PES membrane, many amphiphilic block copolymers have been synthesized and used as additives for surface modification. The object of this study is to develop a hydrophilic PES membrane by blending a comblike amphiphilic block copolymer poly (vinyl pyrrolidone)- block -poly [acrylate- graft -poly (methyl methacrylate)]- block -poly-(vinyl pyrrolidone) [PVP- b -P (AE- g -PMMA)- b -PVP] synthesized by RAFT polymerization. The cytocompatibility performance of PVP- b -P (AE- g -PMMA)- b -PVP modified PES membrane was evaluated, which showed better cytocompatibility compared with that of pristine PES membrane. Endothelial cells cultured on the modified membranes present improved growth in terms of scanning electron microscope observation, MTT assay, and confocal laser scanning microscope observation. These results indicate that the modified membrane has great potential application in blood-contact fields such as hemodialysis and bio-artificial liver supports. Copyright © 2015 John Wiley & Sons, Ltd.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2015
·Vol. 26
·期 5
·476-486
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IF 1.757
Pengfei Ma,Wenming Yang,Ting Fan,Hong Liu,Zhiping Zhou,Jinhui Li,Lin Zhang,Wanzhen Xu
Multi-template molecular imprinting technique was employed for the theoretical study about industrial oil denitrification. Prior to the preparation of multi-template molecularly imprinted polymers (MT-MIPs), density functional theory was used for simulating the imprinted pre-assembly systems composed of template (aniline, indole, or 3-methylinndole) and monomer [methacrylic acid, acrylamide (AM), and 4-vinylpyridine]. MT-MIPs were synthesized as surface MIPs simply and successively by seeded emulsion polymerization or two-stage precipitation polymerization. The experimental results were consistent with the simulative results, which demonstrated that AM was more suitable monomer together. In addition, seeded emulsion polymerization synthesized MT-MIPs with better performance compared with two-stage precipitation polymerization. The adsorption kinetics and adsorption isotherm of MT-MIP prepared with AM using seeded emulsion polymerization were fitted with different models. The fitting results indicated that pseudo-second-order kinetics model and Freundlich isotherm model were suitable for describing the adsorption process of AM seeded emulsion polymerization. This study will provide a certain guidance and theoretical basis for introducing the combination of multi-template molecular imprinting technique and computational simulation into the field of industrial denitrification. Copyright © 2015 John Wiley & Sons, Ltd.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2015
·Vol. 26
·期 11
·1340-1345
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IF 1.757
Xiangming Hu,Weimin Cheng,Wen Nie,Zhenlu Shao
In this study, a temperature-sensitive hydrogel was synthesized using N-isopropylacrylamide (NIPAm), acrylic acid, sodium alginate (SA), and starch as the raw materials, ammonium persulfate as the initiator, and N,N′-methylenebisacrylamide as the crosslinker by the free radical polymerization. The structure and properties of the hydrogel were studied. The morphology and structure were characterized by scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy was used to investigate the effects of the amount of NIPAm, SA, crosslinker, and initiator on the swelling rate (SR) of the hydrogel. The SEM images show that the surface of the hydrogel was uneven and covered with pores, sockets, and laminated intervals, favoring the swelling. The pore size increased with increasing SA amount. The volume phase transition temperature of the hydrogel decreased at a higher NIPAm amount. The SR of the hydrogel stabilized with increasing amount of SA. Increasing amount of NIPAm decreased the SR, and increasing amount crosslinker and initiator increased SR initially, followed by a decrease. Copyright © 2015 John Wiley & Sons, Ltd.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
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2015
·Vol. 26
·期 11
·1351-1355
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IF 1.757
Deming Zeng,Jian Lv,Chun Wei,Chuanbai Yu
Sisal is a natural material and a potential additive to reinforce composites. In this paper, sisal fiber cellulose microcrystalline (SFCM) was obtained from sisal fiber, and SFCM/unsaturated polyester (SFCM/UPR) in-situ resins were prepared via in-situ polymerization. Moreover, SFCM/UPR composites were produced with methods of rolling and molding. Effect of SFCM on dynamic mechanical properties of composites was studied. It is demonstrated that SFCM could significantly improve the dynamic mechanical properties of composites; the effect is closely related with the amount of SFCM, its dispersion in UPR matrix, and interfacial interaction. When the content of SFCM was 3 wt%, at 50°C, the storage modulus of SFCM/UPR composite was 33.22% higher than that of pure UPR. In addition, the glass transition temperature (T g ) was shifted to a higher temperature by 7.5°C, and loss modulus was decreased by 16.24%. The equilibrium value of relaxation modulus at 120 min was 30.52% higher than that of pure UPR composite. Besides, the equilibrium value of creep strain at 120 min was decreased by 41.61% compared with pure UPR composite. Copyright © 2015 John Wiley & Sons, Ltd.
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POLYMERS FOR ADVANCED TECHNOLOGIES
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2015
·Vol. 26
·期 5
·495-501
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IF 1.757
Liang Xiong,Wei-De Zhang,Qing-Shan Shi,Ai-Ping Mai
Novel waterborne polyurethane (WPU) composites based on NiAl-LDH and ZnO were successfully synthesized by in-situ polymerization. The nanostructured NiAl-LDH/ZnO was first grafted by isophorone diisocyanate (IPDI), forming the NiAl-LDH/ZnO-NCO complex with ―NCO group on the surface, which promotes its homogeneous dispersion in WPU matrix. The microstructure and particle distribution of the composites were characterized. The mechanical properties and the water resistance of the composites were improved. Furthermore, the composites also exhibit significant antibacterial activity towards G(−) Escherichia coli and G(+) Staphylococcus aureus . Copyright © 2015 John Wiley & Sons, Ltd.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2015
·Vol. 26
·期 5
·449-456
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IF 1.757
Xiangyu Liu,Jingwen He,Yile Niu,Yefei Li,Ding Hu,Xinnian Xia,Yanbing Lu,Weijian Xu
Photo-responsive block copolymer mPEG-b-poly(Tyr)-g-NB was prepared by introduction of o -nitrobenzyl ester group into the side chain of amphiphilic poly(ethylene glycol)-b-poly( α -hydroxy acids) (mPEG-b-poly(Tyr)) containing pendent alkynyl group via copper-catalyzed azide-alkyne cycloaddition reaction. The amphiphilic mPEG-b-poly(Tyr) was synthesized via the ring-opening polymerization of O -carboxyanhydrides, with monomethoxy poly(ethylene glycol) (mPEG) as macroinitiator. The molecular structure, self-assembly, and photo-controlled release of the obtained mPEG-b-poly(Tyr)-g-NB were thoroughly investigated. mPEG-b-poly(Tyr)-g-NB could self-assemble into spherical micelles in water and showed disassembly under UV light irradiation, which was demonstrated by means of UV-vis spectroscopy, scan electron microscopes, and dynamic light scattering measurement. Fluorescence emission measurements demonstrated that Nile red, encapsulated by micelles, can be released upon UV irradiation. This study provides a convenient way to construct smart poly( α -hydroxy acids)-based nanocarriers for controlled release of hydrophobic drugs. Copyright © 2015 John Wiley & Sons, Ltd.
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POLYMERS FOR ADVANCED TECHNOLOGIES
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2014
·Vol. 25
·期 12
·1391-1395
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IF 1.964
Q. Huang,G. Chen,J. Liu
Polyanilines (PANIs) doped with Zn 2+ and Cu 2+ were synthesized by H 2 O 2 oxidative polymerization of aniline in the presence of corresponding metal chloride in solution. The products were characterized by elemental analysis, UV-Vis-NIR, FTIR and Raman spectroscopies. Scanning electron micrograph was employed to examine the morphology of PANIs fabricated in the presence of different transition metals. Experimental results showed that transition metal ions had been successfully incorporated into the polymer, and there was a strong interaction between the transition metal ions and the PANI chains. The electrical conductivity of PANI doped with Zn 2+ and Cu 2+ is 0.37 and 0.21 S/cm, respectively, which is higher than that of HCl doping PANI corresponding to 0.052 S/cm. The cyclic voltammetric study has indicated that incorporation of metal ions in PANI backbone results in increasing of specific capacitance compared to that of HCl doping PANI. Copyright © 2014 John Wiley & Sons, Ltd.
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POLYMERS FOR ADVANCED TECHNOLOGIES
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2014
·Vol. 25
·期 6
·684-688
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IF 1.964
Chang Peng,Wu Pan,Lin Bao,Shu Chen,Yi Chen,Mingsong Han,Yuanqin Xiong,Weijian Xu
We report a facile method that combined sol–gel reaction, reversible addition–fragmentation chain transfer (RAFT)/macromolecular design via interchange of the xanthates process and thiol-ene click reaction to prepare monodisperse silica core-poly( N -vinylimidazole) (PVim) shell microspheres of 200 nm in average diameters. First, silica with C = C double bonds was prepared by the sol–gel reaction of 3-(trimethoxysilyl)propyl methacrylates (MPS) with tetraethoxysilane in ethanol; SiO 2 @PVim were subsequently prepared by grafting PVim chain (Mn = 9800 g/mol, polydispersity index = 1.22) to MPS-SiO 2 via the thiol-ene click chemisty. The obtained SiO 2 @PVim microspheres show higher catalytic activity toward the hydrolysis of p -nitrophenyl acetate compared with the PVim homopolymers. The as-prepared composites have been characterized by scanning electron microscopy, transmission electron microscopy, thermal gravimetric analysis and Fourier transform infrared spectrometry analysis. Copyright © 2014 John Wiley & Sons, Ltd.
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POLYMERS FOR ADVANCED TECHNOLOGIES
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2014
·Vol. 25
·期 5
·575-580
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IF 1.964
Aihua Ma,Tingwei Hu,Shaoyun Shan,Hongying Su,Shuisheng Wu,Qingming Jia
HNO 3 -doped poly(o-aminophenol) (PoAP) was synthesized by a facile chemical polymerization without using any surfactants or templates. Sphere-like microstructures of PoAP are obtained via self-assembling of two-dimensional nanoplates. The different microstructures of PoAP could be easily controlled by controlling polymerization conditions, and the possible formation mechanism of PoAP microstructures follows the prickly-fluffy-full sphere growth process. By susceptibility test, the as-synthesized PoAP exhibits superior and sustained antibacterial activities against the typical Gram-positive Bacillus subtilis . Transmission electron microscope, scanning electron microscopy, and antibacterial test showed that morphologies of the PoAP have an obvious influence on its antibacterial activities, and the reason was further discussed. The resultant PoAP in this study may have potential applications as biological materials. Copyright © 2014 John Wiley & Sons, Ltd.
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POLYMERS FOR ADVANCED TECHNOLOGIES
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2013
·Vol. 24
·期 12
·1040-1050
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IF 1.635
Chao He,Chuan-Xiong Nie,Wei-Feng Zhao,Lang Ma,Tao Xiang,Chong (Sage) Cheng,Shu-Dong Sun,Chang-Sheng Zhao
In this study, random terpolymers of methoxy poly(ethylene glycol)-poly(sodium styrene sulfonate- co -methyl methacrylate) (MPEG-P(SSNa- co -MMA)) integrated with antifouling and anticoagulant properties were synthesized by atom transfer radical polymerization (ATRP) for the first time and confirmed by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), and gel permeation chromatography (GPC). The terpolymers with desired antifouling and anticoagulant segments were then used as amphiphilic additives to modify polyethersulfone membranes by an engineering blended approach. Water contact angle (WCA) results indicated that the surface hydrophilicity of the modified membranes enhanced. Protein ultrafiltration experiments showed that the antifouling ability of the modified membranes increased. In addition, the modified membranes showed decreased protein adsorption (bovine serum albumin, BSA), suppressed platelet adhesion, and prolonged activated partial thromboplastin time (APTT). Copyright © 2013 John Wiley & Sons, Ltd.
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