Polymer Chemistry
·
2013
·Vol. 4
·期 19
·5074-5085
·
IF 5.231
Jiang Yuan,Xiaobo Huang,Pengfei Li,Li Li,Jian Shen
Two major complications generally occur in blood-contacting devices, namely thrombus formation and microbial invasion and infection. Therefore, hemocompatible and antibiofouling surfaces, which function as barriers to bacterial and cell adhesion, are essential. Herein, we report the successful grafting of zwitterionic polysulfobetaine brushes onto a cellulose membrane (CM) via surface-initiated reversible addition–fragmentation chain-transfer (SI-RAFT) polymerization for improving hemocompatibility and antibiofouling property. Both pristine and polysulfobetaine brush-modified CM substrates were characterized by attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), water contact angle measurements (WCA), X-ray photoelectron spectroscopy analysis (XPS), and atomic force microscopy (AFM). Experimental observations demonstrated the successful grafting of polysulfobetaine brushes, where brush thicknesses were found to increase gradually with polymerization time and monomer concentrations. Tests conducted by investigating platelet adhesion, hemolytic rates and protein adsorption indicated that polysulfobetaine brush-grafted CMs had excellent hemocompatibility featuring lower platelet adhesion and protein adsorption properties without causing hemolysis. E. coli adhesion and HeLa cell adhesion tests showed that grafted CMs had superior antibacterial adhesion properties and long-term cell adhesion resistance for up to four days. The functionalized cellulose substrate described holds great potential for use in biomedical applications.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 39
·e54462
·
IF 3
Jia Liu,Zhengchun Cai,Yongxin Ji
The synthesis of bio-based modified amphoteric epoxy modified acrylate sizing emulsion based on reversible addition fragmentation chain transfer (RAFT) polymerization and its application in paper sizing were studied. A macromolecular chain transfer agent for RAFT polymerization was synthesized by the esterification of epoxy resin E-51 with RAFT agent to eliminate the active groups on RAFT agent. Amphoteric polymer emulsifiers with good emulsification and dispersion effects in acidic and alkaline media were successfully prepared by RAFT polymerization. After neutralization, other monomers were polymerized to access cationic sizing emulsion (acid neutralization) and anionic sizing emulsion (alkali neutralization). The effects of bio-based monomer content, hydrophilic monomer dimethylaminoethyl methacrylate (DM) content and degree of quaternization on the properties of sizing emulsion and sizing paper were further explored. In addition to the particle size and polymer dispersion index (PDI) of latex particles in different experimental groups, the water resistance, folding resistance, bursting strength, tensile strength and surface roughness of sized paper were analyzed and evaluated. Based on these results, a better sizing emulsion formulation was established. It was confirmed that the addition of bio-based monomers can improve the sizing performance of paper.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Zenghui Cheng,Yupeng Liu,Daihui Zhang,Chuanwei Lu,Chunpeng Wang,Feng Xu,Jifu Wang,Fuxiang Chu
Utilization of natural sustainable feedstock to fabricate polymers has attracted remarkable attention. In this work, we reported a strategy to prepare a series of grafted copolymers from rosin, fatty acids and ethyl cellulose . The process involved the preparation of EC-based macro-RAFT agent through a simple esterification reaction, followed by a “grafting from” reversible addition-fragmentation chain transfer polymerization (RAFT) of DAGMA (derived from rosin) and LMA (derived from fatty acid) to achieve a class of EC- g -P(DAGMA- co -LMA) graft copolymers with a tunable T g tuned by the DAGMA/LMA molar ratio. Then, hexamethylene diisocyanate (HDI) was used to crosslink these graft copolymers. The mechanical and dynamic thermo-mechanical properties of tests showed that elastic recovery values of copolymers were enhanced to 90%, as compared to the un-crosslinked samples. Additionally, all these polymers showed an excellent UV absorption performance. This study provides a facile way to fabricate biobased elastomeric materials with improved mechanical properties.
研究领域:
材料科学
·
可持续化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2017
·Vol. 56
·期 2
·229-236
·
IF 2.952
Qian Yang,Xianhong Zhang,Wenchao Ma,Yuhong Ma,Dong Chen,Li Wang,Changwen Zhao,Wantai Yang
The benzaldehyde derivatives, such as 2,4-dimethoxy benzaldehyde (PC1) and p -anisaldehyde (PC2), were successfully used as photoredox catalysts (PCs) in combination with typical RAFT agent 4-cyano-4-(phenylcarbonothioylthio)pentanoic acid (CTP) for the controlled photoinduced electron transfer RAFT polymerization (PET-RAFT) of methyl methacrylate (MMA) and benzyl methacrylate (BnMA) at room temperature. The kinetics of the polymerizations showed first order with respect to monomer conversions. Besides, the average number molecular weights ( M n ) of the produced polymers increased linearly with the monomer conversions and kept relatively narrow polydispersity (PDI = M w /M n ). For example, the M n of PMMA increased from about 3400 to 17,300 g mol −1 with the increasing in monomer conversion from 11% to 85%, and the PDI maintained around 1.36. The living features of polymerizations with the PC1 and PC2 as catalysts have also been further supported by chain extension and synthesis of PMMA- b -PBnMA diblock copolymer. As a result, the simplicity and efficiency of benzaldehyde derivatives catalyzed PET-RAFT polymerization have been demonstrated under mild conditions. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018 , 56 , 229–236
研究领域:
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2011
·Vol. 212
·期 7
·737-743
·
IF 2.437
Hao Chen,Yingwu Luo
Nanocapsules made of a cross-linked poly(dodecafluoroheptyl acrylate) shell were successfully synthesized by interfacial RAFT miniemulsion polymerization. The well-defined hollow fluorinated polymer structures were obtained by the subsequent removal of the liquid core materials. The core/shell ratio could be easily tuned up to 1:1 by changing the conditions. In the cases of high core/shell ratio of 1:2 and 1:1, the nanocapsules were severely deformed, which was improved by increasing the cross-linker amount up to 30 wt.-%. It was concluded that the utility of the interfacial RAFT miniemulsion polymerization overcame the thermodynamic and kinetic barriers in a conventional miniemulsion polymerization.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2015
·Vol. 6
·期 12
·2283-2289
·
IF 5.52
Tianchi Xu,Lifen Zhang,Zhenping Cheng,Xiulin Zhu
A number of phosphorus-based monomers have been evaluated by free radical polymerization or photopolymerization, but fewer examples have been involved in the “living”/controlled radical polymerization (LRP) of such type of monomers, whereas LRP techniques allow the synthesis of well-defined polymers with designable structures, compositions and properties. In this work, a novel methacrylate based monomer with a bisphosphonate group 4-(bis(diethoxyphosphoryl)methyl)phenyl methacrylate (BPMA) was synthesized first and then polymerized by reversible addition-fragmentation chain transfer (RAFT) polymerization. The polymerization showed typical “living” features such as the polymerization, which indicates first order kinetics with respect to monomer concentration, and the molecular weights of the resultant polymers increase with monomer conversion. Furthermore, the resultant polymers demonstrated better thermal and flame-retardant properties. According to the thermal gravimetric analyzer (TGA) test, the amount of residual carbonaceous mass (char) increased with the molecular weight of the resultant polymers. Furthermore, the micro-scale combustion calorimetry (MCC) test also confirmed its superior flame-retardant performance.
研究领域:
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Kun Liu,Qiaoqiao Xiong,Zhuowei Gu,Feng Zhang,Yawen Fu,Fengli Xie,Wenjun Yi,An Li,Jundong Xu,Lijun Li
Visible light-mediated photoinduced reversible addition-fragmentation chain transfer polymerization (RAFT) copolymerization of 1,3-pentadiene isomers and maleic anhydride (MAH) in the absence of photocatalysts or photoinitiators was realized in tetrahydrofuran (THF) solvent at r.t. under various visible wavelengths. The well-defined alternating copolymers were successfully and efficiently synthesized by directly using O -ethyl- S -benzoic thioanhydride ( EBT ) as chain transfer agent activated by blue light (460 nm). The conventional thermal-initiated radical copolymerization of 1,3-pentadiene (PD) isomers (except cis -1,3-pentadiene (CP)) and MAH gave both DA cycloaddition products and alternating sequence copolymers. In contrast, the alternating copolymer was the only isolated product in this photoinitiated polymerization system, in which the DA reaction was completely suppressed. Moreover, both trans -1,3-pentadiene (TP) and PD isomers can be copolymerized with MAH to give alternating copolymers with high yields up to 100%, although the photopolymerization rates are in the order: PD > CP > TP. And the copolymerization can be implemented by simply switching the light source ON/OFF. We supposed that the donor–acceptor interaction between the PD and MAH (similar to St (styrene)/MAH system) plays an important role in this novel light-induced RAFT alternating copolymerization behavior.
研究领域:
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2017
·
IF 4.164
Cunfeng Song,Meijie Wang,Xin Liu,He Wang,Xiaoling Chen,Lizong Dai
Surface-initiated reversible addition-fragmentation chain transfer (RAFT) polymerization has been utilized to fabricate high-capacity strong anion-exchange (AEX) membrane for the separation of protein. By means of RAFT polymerization, quaternized poly(3-(methacrylamidomethyl)-pyridine) brushes formed 3-dimensional nanolayers on the surface of porous anodic aluminum oxide (AAO)-silica composite membrane. The surface properties of the membranes were analyzed by SEM, water contact angle, ATR-FTIR, XPS and TGA. To investigate the adsorption performance, the new AEX membranes were applied to recover a model protein, ovalbumin (OVA). High adsorption capacities of 95.8 mg/g membranes (static) and 65.3 mg/g membranes (dynamic) were obtained at ambient temperature. In the further studies, up to 90% of the adsorbed OVA was efficiently eluted by using phosphate buffer-1 M NaCl as elution medium. The successful separation of OVA with high purity from a mixture protein solution was also achieved by using the AEX membranes. The present study demonstrated that under mild reaction condition, RAFT polymerization can be used to fabricate ion-exchange membrane which has many remarkable features, such as high capacity and selectivity, easy elution and so on.
研究领域:
材料科学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 10
·3214
·
IF 4.927
Yi Gao,Xuesong Yao,Qinggeng Jiang,Jianhe Liao,Yongping Chen,Rentong Yu
Microgels have unique and versatile properties allowing their use in forward osmosis areas as a draw agent. In this contribution, poly(4-vinylpyridine) (P4VP) was synthesized via RAFT polymerization and then grafted to a poly(N-Isopropylacrylamide) (PNIPAAm) crosslinking network by reverse suspension polymerization. P4VP was successfully obtained by the quasiliving polymerization with the result of nuclear magnetic resonance and gel permeation chromatography characterization. The particle size and particle size distribution of the PNIPAAm-g-P4VP microgels containing 0, 5, 10, 15 and 20 wt% P4VP were measured by means of a laser particle size analyzer. It was found that all the microgels were of micrometer scale and the particle size was increased with the P4VP load. Inter/intra-molecular-specific interactions, i.e., hydrogen bond interactions were then investigated by Fourier infrared spectroscopy. In addition, the water flux measurements showed that all the PNIPAAm-g-P4VP microgels can draw water more effectively than a blank PNIPAAm microgel. For the copolymer microgel incorporating 20 wt% P4VP, the water flux was measured to be 7.48 L∙m−2∙h−1.Keywords:microgel;forward osmosis;draw agent;P4VP
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2013
·Vol. 20
·期 7
·1-11
·
IF 2.019
Cheng Chuanjie,Bai Xiongxiong,Liu Shaojin,Huang Qinghua,Tu Yuanming,Wu Haiming,Wang Xiaoji
A cardanol-derived reversible addition-fragmentation chain transfer (RAFT) agent was synthesized in 57 % total yield, and a cardanol-based anionic surfactant was also facilely prepared. Emulsion polymerization of methyl methacrylate (MMA) was realized to form a cardanol-terminated PMMA polymer by using the novel RAFT agent as well as the cardanol-based anionic surfactant. To improve the properties of cardanol-terminated PMMA as a material, UV-curing was performed. According to the comprehensive behavior of the UV-cured resins, optimal irradiation time was 20 min.
研究领域:
材料科学
·
高分子化学
·
可持续化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 16
·8144-8156
·
IF 3.708
Chao Zhou,Shanshan Qian,Aokai Zhang,Liqun Xu,Jian Zhu,Zhengping Cheng,En-Tang Kang,Fang Yao,Guo Dong Fu
Linear polystyrene (PS) with well-defined molecular structure and accurate numbers of bromo groups on both ends were synthesized via multiple-step alternative RAFT polymerization of N-bromopropyl maleimide and β-pinene monomers. The bromo end groups were transformed into the azido moieties via nucleophilic substitution. The reaction of as-synthesized linear PS having a named number of azide groups on ends ((N3)x–PS–(N3)x) with mono- and dialkynyl-terminated PEG (dA-PEG) via copper(I)-catalyzed azide–alkyne cycloaddition (CuAAC) leads to the formation of the well-defined PS–PEG amphiphilic copolymers and polymeric co-networks (APCNs). The as-prepared APCNs exhibit unique ordered separated hydrophilic and hydrophobic phases, and a variable swelling capacity both in polar and non-polar solvents.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
Applied Sciences-Basel
·
2019
·Vol. 9
·期 3
·603
·
IF 2.217
Wenzhong Ma,Yuchen Zhao,Zhiwei Zhu,Lingxiang Guo,Zheng Cao,Yanping Xia,Haicun Yang,Fanghong Gong,Jing Zhong
An efficient synthesis route was developed for the preparation of multiwalled carbon nanotube (MWCNT) nanohybrids using azide-terminated poly(methyl methacrylate) (PMMA) via a combination of reversible addition fragmentation chain transfer (RAFT) and the click reaction. A novel azido-functionalized chain transfer agent (DMP-N3) was prepared and subsequently employed to mediate the RAFT polymerizations of methyl methacrylate (MMA). The RAFT polymerizations exhibited first-order kinetics and a linear molecular weight dependence with the conversion. The kinetic results show that the grafting percentage of PMMA on the MWCNTs surface grows along with the increase of the reaction time. Even at 50 °C, the grafting rate of azide-terminated PMMA is comparatively fast in the course of the click reaction, with the alkyne groups adhered to MWCNTs in less than 24 h. The successful functionalization of PMMA onto MWCNT was proved by FTIR, while TGA was employed to calculate the grafting degree of PMMA chains (the highest GP = 21.9%). Compared with the pristine MWCNTs, a thicker diameter of the MWCNTs-g-PMMA was observed by TEM, which confirmed the grafted PMMA chain to the surface of nanotubes. Therefore, the MWCNTs-g-PMMA could be dispersed and stably suspended in water.Keywords:multi-wall carbon nanotube (MWCNT);azide-alkyne click chemistry;RAFT polymerization;PMMA
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）