JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2011
·Vol. 49
·期 22
·4721-4724
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IF 3.894
Hou Chen,Min Zhang,Mengmeng Yu,Hongyan Jiang
Graphical Iron tube was applied as catalyst source in the design of continuous SET-LRP of AN without any ligand using BPN as initiator in NMP and DMF, respectively. First-order kinetics of polymerization with respect to the monomer concentration, linear increase of the molecular weight, and narrow polydispersity with monomer conversion showed the controlled radical polymerization characters. An increase in polymerization rate in NMP was observed compared with in DMF. The living feature of PAN was verified by chain extensions of PAN with MMA.
研究领域:
化学工程
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高分子科学
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 87
·70758-70765
·
IF 3.84
Leli Wang,Ying Wu,Yongjun Men,Jianan Shen,Zhengping Liu
Single electron transfer living radical polymerization (SET-LRP) was employed to prepare thermal-sensitive starch graft poly(N-isopropylacrylamide) (Starch-g-PNIPAM) with soluble Starch-Br as macro-initiator at molecular level. And Starch-g-PNIAPM with improved graft ratio and controlled length of graft chains were obtained. The effects of molar ratio of monomer to initiator and temperature on polymerization were investigated. The thermal responsibilities investigated by 1H NMR and UV showed that the LCST ranged from 31.5 °C to 23 °C with the increase of the length of PNIPAM chains and the concentrations of copolymers. Starch-g-PNIPAM hydrogels were gained when adding N,N′-methylenebisacrylamide as crosslinking agent and the swelling and deswelling behaviors were also investigated. The obtained hydrogels possess a high equilibrium swelling ratio as high as 1826%, and an extremely rapid shrinking rate as fast as losing more than 85% of water in 5 min.
研究领域:
高分子化学
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材料科学
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DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2013
·Vol. 51
·期 19
·4088-4094
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IF 3.543
Zhihai Hao,Jiang Zhang,Hou Chen,Delong Liu,Dongju Wang,Huanying Qu,Jimei Lang
A novel catalyst system based on La(0)/hexamethylenetetramine (HMTA) complexes is used for single electron transfer-living radical polymerization (SET-LRP) of acrylonitrile (AN) in the presence of ascorbic acid (VC) with carbon tetrachloride (CCl 4 ) as a initiator and N , N -dimethylformamide (DMF) as a solvent. Compared with SET-LRP of AN in the absence of VC, monomer conversion is markedly increased. SET-LRP of AN in the presence of VC is also conducted in the presence of air. The kinetic studies show that the polymerizations both in the absence of oxygen and in the presence of air proceed in a well-controlled manner. With the respect to the polymerization in the absence of oxygen, the polymerization in the presence of air provides slower reaction rate and broader polydispersity. Effects of amount of VC, La, CCl 4 , and are investigated in detail. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013 , 51 , 4088–4094
研究领域:
高分子化学
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材料科学
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DOI
高影响因子
Royal Society Open Science
·
2020
·Vol. 7
·期 3
·
IF 2.646
Yazhen Wang,Shuang Li,Liqun Ma,Shaobo Dong,Li Liu
Corn stalk was used as the initial material to prepare a corn stalk matrix-g-polyacrylonitrile-based adsorbent. At first, the corn stalk was treated with potassium hydroxide and nitric acid to obtain the corn stalk-based cellulose (CS), and then the CS was modified by 2-bromoisobutyrylbromide (2-BiBBr) to prepare a macroinitiator. After that, polyacrylonitrile (PAN) was grafted onto the macroinitiator by single-electron transfer living radical polymerization (SET-LRP). A novel adsorbent AO CS-g-PAN was, therefore, obtained by introducing amidoxime groups onto the CS-g-PAN with hydroxylamine hydrochloride (NH2OH · HCl). FTIR, SEM and XPS were applied to characterize the structure of AO CS-g-PAN. The adsorbent was then employed to remove Pb(II) and Cu(II), and it exhibited a predominant adsorption performance on Pb(II) and Cu(II). The effect of parameters, such as temperature, adsorption time, pH and the initial concentration of metal ions on adsorption capacity, were examined in detail during its application. Results suggest that the maximum adsorption capacity of Pb(II) and Cu(II) was 231.84 mg g–1 and 94.72 mg g−1, and the corresponding removal efficiency was 72.03% and 63%, respectively. The pseudo-second order model was more suitable to depict the adsorption process. And the adsorption isotherm of Cu(II) accorded with the Langmuir model, while the Pb(II) conformed better to the Freundlich isotherm model.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2014
·
IF 0
Dong J. Wang,Hou Chen,Hui Xu,Jin M. Sun,Yuan Y. Xu
Polyacrylonitrile (PAN) was grafted onto the surface of a wheat straw matrix (WSM) by single-electron transfer-living radical polymerization (SET-LRP). A novel agricultural residue adsorbent amidoxime WSM-g-PAN (AO WSM-g-PAN) was obtained by modifying WSM-g-PAN with hydroxylamine hydrochloride (NH2OH·HCl). AO WSM-g-PAN was used to remove heavy metal ions. Compared with WSM, the adsorption capacity of AO WSM-g-PAN for Hg(II) increased greatly, and the maximum adsorption capacity was 4.7 mmol g–1. AO WSM-g-PAN could effectively adsorb Hg(II) from binary ion systems in the existence of Ni(II), Pb(II), Cu(II), Zn(II), and Ag(I).
研究领域:
环境科学
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材料科学
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产品关联
DOI
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2015
·Vol. 53
·期 16
·1872-1879
·
IF 3.113
Jianwen Tian,Dazhuang Xu,Meiying Liu,Fengjie Deng,Qing Wan,Zhen Li,Ke Wang,Xiaohui He,Xiaoyong Zhang,Yen Wei
Surface functionalization of carbon nanotubes (CNTs) with a thermo responsive polymer was achieved via combination of mussel inspired chemistry and surface initiated single electron transfer living radical polymerization (SET-LRP). In this procedure, CNTs were first coated with polydopamine (PDA) through self polymerization under a rather mild condition. And then PDA functionalized CNTs bearing with amino and hydroxyl groups were further reacted with bromo isobutyryl bromide. Finally, a thermo responsive polymer poly(N-isopropylacrylamide) (PNIPAM) was introduced on the CNTs via SET-LRP. The successful surface modification of CNT-PDA-PNIPAM was evidenced by a series of characterization techniques. The resulting CNT-PDA-PNIPAM showed significant enhancement of dispersibility in both aqueous and organic solvents. More importantly, these CNT-polymer nanocomposites showed obvious thermo responsive behavior due to the surface coating CNTs with PNIPAM. As compared with previous methods, this method is not required oxidation of CNTs to introduce funcitonal groups for immobilization of the polymerization initiators. More importantly, this method could also be utilized for fabricating many other polymer nanocomposites because of the strong and universal adhesive of PDA to various materials. It is therefore, the novel strategy via marrying mussel inspired chemistry with SET-LRP should be a simple, general and effective method for surface functionalization. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015 , 53 , 1872–1879
研究领域:
材料科学
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聚合物化学
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纳米技术
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DOI
高影响因子
CHEMICAL PAPERS
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2017
·Vol. 69
·期 12
·1608-1616
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IF 1.258
Cheng Chuan-Jie,Zhang Xu,Bai Xiong-Xiong,Li Jin,Cao Xing-Xing,Wang Jing-Lan
A benzophenone-containing SET-LRP initiator based on renewable and abundant cardanol was synthesised in 71 % yield using the selective etherification reaction. Next, methyl methacrylate (MMA) as a monomer was polymerised under SET-LRP conditions using the newly prepared initiator to prepare cardanol-end poly(methyl methacrylate) (PMMA). The kinetic results of the polymerisation indicated that the reaction was controllable when the monomer conversion was lower than approximately 50 %, and the molecular masses of PMMA measured by GPC were higher than the theoretical values while the monomer conversion was more than 50 %. In addition, most of the carbon-carbon double bonds of the side hydrocarbon chain of the end-cardanol group in the PMMA were kept intact from 1 H NMR spectrum characterisation. Accordingly, when the cardanol-end PMMA together with a tertiary amine-containing cardanol derivative was irradiated by UV light, the corresponding UV-cured resin was obtained. The chemical resistance and hardness of the UV-cured film were enhanced with the increasing irradiation time.
研究领域:
材料科学
·
有机化学
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 111
·91308-91314
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IF 3.84
Chunning Heng,Meiying Liu,Ke Wang,Xiaoyan Zheng,Hongye Huang,Fengjie Deng,Junfeng Hui,Xiaoyong Zhang,Yen Wei
A highly benign, simple and effective strategy was successfully developed for the first time for the fabrication of hydrophilic thermo-responsive polymer modified silica nanoparticles (SiO2-PDA-poly(NIPAM)) at low temperature and under mild reaction conditions via a combination of mussel inspired chemistry and SET-LRP. The SiO2 NPs were first modified with polydopamine (PDA), which was formed by the self-polymerization of dopamine under rather mild conditions. 2-Bromo-2-methylpropionyl bromide was covalently attached on the surface of the PDA modified SiO2 NPs. Afterward, the poly(NIPAM) was grown in situ on the surface of the Br-containing SiO2 NPs by the SET-LRP method. Consequently, the surface of the SiO2-PDA nanoparticles is intrinsically covered by a layer of free poly(NIPAM) chains, which enables the poly(NIPAM) to be colloidally stable not only at room temperature, but also upon incubation in the presence of proteins under physiological conditions. After modifying with PNIPAM, the functional SiO2 NPs retain their pristine structure, however their dispersibility was significantly improved in polar and nonpolar solutions. As compared with previous methods, the strategy developed in this work is rather simple and effective. More importantly, due to the universality of mussel inspired chemistry, this novel strategy could also be used for the surface modification of many other materials.
研究领域:
材料科学
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聚合物化学
·
纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2012
·Vol. 50
·期 24
·4995-4999
·
IF 3.919
Zhihai Hao,Hou Chen,Delong Liu,Lijun Fan
Sn(0)-mediated single electron transfer-living radical polymerization (SET-LRP) of acrylonitrile (AN) with carbon tetrachloride (CCl 4 ) as initiator and hexamethylenetetramine (HMTA) as ligand in N, N -dimethylformamide (DMF) was studied. The polymerization obeyed first order kinetic. The molecular weight of polyacrylonitrile (PAN) increased linearly with monomer conversion and PAN exhibited narrow molecular weight distributions. Increasing the content of Sn(0) resulted in an increase in the molecular weight and the molecular weight distribution. Effects of ligand and initiator were also investigated. The block copolymer PAN- b -polymethyl methacrylate with molecular weight at 126,130 and polydispersity at 1.36 was successfully obtained. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012
研究领域:
高分子化学
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聚合反应
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功能高分子
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材料化学
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有机合成
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DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
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2023
·Vol. 61
·期 22
·2945-2953
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IF 3.4
Xiaojing Feng,Wenxia Yuan
We present the synthesis of optically active polymers derived from S-phenylethyl acrylate and R-phenylethyl acrylate for the first time. Cu(0) wire-catalyzed single electron transfer-living radical polymerization (SET-LRP) methodology which provides a feasible platform makes its new application in designing and developing these two polymers. At various degrees of polymerizations (DPs) ranging from 100 to 400, first-order kinetics is observed. In all cases, SET-LRP demonstrates a rapid polymerization rate while maintaining excellent control over polymer's molecular weight, polydispersity and chain-end functionality. These advantages facilitate the development of both homopolymers and block copolymers through in situ chain extensions. The circular dichroism measurement confirms that the SET-LRP method yields optically active polymers derived from two enantiomeric monomers, which exhibit mirrored spectra. Graphical
研究领域:
高分子化学
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有机合成
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手性材料
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自由基聚合
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DOI
高影响因子
Polymer Chemistry
·
2015
·Vol. 6
·期 19
·3708-3715
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IF 5.52
Lulu Xue,Zhonglin Lyu,Yafei Luan,Xinhong Xiong,Jingjing Pan,Gaojian Chen,Hong Chen
Circulating tumor cells (CTCs) exist in extraordinarily low numbers in the blood of patients with solid tumors, and thus the discovery of a more effective, economical and specific way to capture tumor cells is essential and still remains a tremendous challenge. In this work, the glycopolymer, poly(N-acryloyl glucosamine) (PAGA), and TD05 aptamers were combined on silicon nanowire arrays (SiNWAs) to capture Ramos cells through SET-LRP and click chemistry for the first time. The polymerizations showed controllable living features using 2-hydroxyethyl α-bromoisobutyrate (HEBiB) as a sacrificial initiator. In a serum-containing environment, PAGA-modified surfaces could catch small amounts of Ramos cells. Furthermore, the number of captured specific Ramos cells increased extensively compared with the control after the introduction of the aptamer molecule TD05 onto the PAGA-modified surface. A few non-specific Baf3 cells were captured on the surfaces prepared. The results revealed the synergistic effect generated by combining a glycopolymer and aptamer, which could achieve multivalency-enhanced effective and specific cancer cell capturing, thus suggesting that this can be a promising approach for cancer detection.
研究领域:
生物医学工程
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肿瘤学
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材料科学
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DOI
高影响因子
Polymer Chemistry
·
2014
·Vol. 6
·期 10
·1786-1792
·
IF 5.368
Qing Wan,Meiying Liu,Jianwen Tian,Fengjie Deng,Guangjian Zeng,Zhen Li,Ke Wang,Qingsong Zhang,Xiaoyong Zhang,Yen Wei
An efficient and facile strategy was developed for the surface modification of functional carbon nanotubes (CNTs) by the combination of mussel inspired chemistry and single electron transfer living radical polymerization (SET-LRP). This method involves the dopamine (DA) formation of polydopamine (PDA), which was coated on the surface of pristine CNTs via self-polymerization in alkaline solution. Then, the Br-containing initiator was covalently attached on the surface of CNTs modified with PDA. Subsequently, the poly[poly(ethylene glycol) methyl ether methacrylate] (PPEGMA) was in situ grown on the surface of Br-containing CNTs via the SET-LRP method. The resulting functional materials were characterized by a series of characterization techniques. It was demonstrated that PPEGMA chains were successfully conjugated to the surface of CNTs via a combination of mussel inspired chemistry and SET-LRP. After modifying with PPEGMA, the functional CNTs retain their pristine structure, but their dispersibility was significantly improved in polar and nonpolar solutions. Compared with previous methods, the strategy developed in this work is rather simple and effective. More importantly, due to the universality of mussel inspired chemistry, this novel strategy could also be used for the surface modification of many other materials.
研究领域:
材料科学
·
聚合物化学
·
纳米技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）