POWDER TECHNOLOGY
·
2022
·
IF 5.64
Yu Xing,Qian Li,Xiaoyi Chen,Miao Li,Shujing Wang,Yan Li,Tianyu Wang,Xitong Sun,Xianzhen Li
A series of polymer brushes were formed on the surface of mesoporous silica microspheres by copolymerizing 1-vinyl imidazole and acrylic acid through reversible-addition fragmentation chain transfer (RAFT) polymerization, with pI-switchable property and high grafting groups content. The resulting materials (SiO 2 @poly(VI- co -AA)) were then applied for removing Ni(II) from aqueous solution with a fast adsorption rate, and the maximum adsorption capacity was 62.81 mg/g. Significantly, the removal rate of 30 mg/L of Ni(II) could reach up to 99.40%, and the adsorbent also exhibited a good reusability, with the desorption efficiency of over 99%. Furthermore, the adsorption mechanism was supposed to be electrostatic interaction and complexation characterized by Zeta potentials and XPS . It implied that the SiO 2 @poly(VI- co -AA) microspheres could be considered as a potential adsorbent for removing Ni(II) from wastewater, and was expected to expand its application to remove other heavy metals and dyes.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Soft Matter
·
2011
·Vol. 7
·期 11
·5348-5352
·
IF 4.457
Yin Wang,Guohua Jiang,Ming Zhang,Lina Wang,Rijing Wang,Xinke Sun
A series of novel shell cross-linked nanocapsules were facilely fabricated in an inverse miniemulsion reversible addition–fragmentation chain transfer (RAFT) system, in which poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) acted as a stabilizer and macroinitiator. The as-prepared nanocapsules with PDMAEMA cores and poly(methylacrylic acid) (PMAA) shells, had a size of 220 nm and can be used as a carrier for the encapsulation of hydrophilic components such as inorganic salts.
研究领域:
材料科学
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2016
·Vol. 217
·期 9
·1047-1056
·
IF 2.495
Liang Qiu,Chao-Ran Xu,Feng Zhong,Chun-Yan Hong,Cai-Yuan Pan
Pure cross-linked spherical micelles, nanowires, and vesicles are successfully fabricated from poly(2-hydroxypropyl methacrylate- b - p -(methacryloxyethoxy)benzaldehyde)s (PHPMA– b –PMAEBAs) through reversible addition-fragmentation chain transfer dispersion polymerization of MAEBA in methanol using PHPMA as a macro-CTA and subsequent cross-linking. The cross-linking reaction is conducted by stirring a mixture of 1,4-butanediamine and the resultant nano-objects in methanol at room temperature. For all polymerizations with feed molar ratios of MAEBA/PHPMA ranging from 75/1 to 240/1, the monomer MAEBA conversions are almost complete, and block copolymers with controlled molecular weight are obtained. The transmission electron microscopy, dynamic light scattering, and gel permeation chromatography results reveal that the following three factors significantly influence the morphology of the nano-objects: the feed molar ratio of MAEBA/PHPMA, the copolymer concentration, and the degree of polymerization of PHPMA. The cross-linked nano-objects are very stable in good solvents, the spheres and nanowires slightly decrease in size after cross-linking, whereas the vesicles slightly increase in size. The cross-linked nano-objects are stable in neutral solutions, but they dissociate in weekly acidic solutions. The loading of 1-pyrenemethylamine (PMA) into the vesicles and the unloading of PMA from the vesicles are studied.
研究领域:
高分子化学
·
纳米材料
·
药物递送
·
生物医学工程
·
胶体与界面科学
✓ 已验证
DOI
高影响因子
BIOMACROMOLECULES
·
2025
·
IF 5.4
Yu Sun,Yushuang Shang,Xinyu Zhang,Zhaoyan Ge,Fengni Liu,Jian Shen,Jiang Yuan
Mimicked by the structure of dimethyl sulfoxide propionate (DMSP), a novel zwitterion monomer of N-methylacryloyl S-methyl l-cysteine methyl sulfonium salt (NMASMCMS) was synthesized and characterized for the first time through three steps using l-cysteine as a starting material. Poly(NMASMCMS) brushes were constructed on PET sheets via surface-initiated reversible addition–fragmentation chain-transfer (SI-RAFT) polymerization. The physical and chemical structures were characterized by water contact angle (WCA), attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). The polymer brush grafted sheets (PET-B) had good hydrophilicity and high lubricity. Moreover, PET-B sheets exhibited excellent antifouling and hemocompatible properties with low protein adsorption, bacterial adhesion, platelet adhesion, and hemolysis.
研究领域:
材料科学
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生物医学工程
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Shixue Wang,Hao Zhang,Wenjing He,Hua Zhou,Youhua Tao
The synthesis of sequence-controlled polymers is an important emerging trend in recent polymer science. However, the relationship between the sequence structure and performance of the polymer was rarely studied. Here, we synthesized a series of sequence-controlled proline-based multi-block copolymers via one-pot iterative RAFT polymerization , it achieved high monomer conversions (>98%), precise control of molecular weight, and low polydispersity. The relationship studied between the sequence structure of multi-block copolymers and thermoresponsive performance revealed that the LCSTs of these copolymers are sequence dependent, and it can be altered by variation the sequence structure. In addition, temperature-variable 1 H NMR analysis and dissipative particle dynamics (DPD) simulation technique were chosen to further study on the nature of phase transition and the relationship between sequence structure and thermoresponsiveness. Thus, we have demonstrated a concise method to construct sequence-controlled bio-based copolymers with precisely adjustable structures and functions which can be applied to the design of biological and medical materials.
研究领域:
高分子化学
·
生物材料科学
✓ 已验证
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2016
·
IF 1.947
Zhi-Wei Yu,Shu-Xi Gao,Kai Xu,You-Xiong Zhang,Jun Peng,Ming-Cai Chen
Organic/inorganic hybrid polymers have been widely studied for their potential use in nanocontainers and nanocarriers. In this article, one star-shaped hybrid polymer, polyhedral oligomeric silsesquioxane (POSS) grafted poly( N , N -(dimethylamino)ethyl methacrylate) (POSS- g -PDMA), was synthesized via reversible addition-fragmentation chain transfer polymerization (RAFT). The pH stimuli-responsive character of POSS- g -PDMA in aqueous solution were also studied.
研究领域:
材料科学
·
高分子化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2021
·
IF 4.43
Jia-Wei Li,Miao Chen,Jie-Mei Zhou,Cai-Yuan Pan,Wen-Jian Zhang,Chun-Yan Hong
Polymerization-induced self-assembly (PISA) is an efficient and robust strategy to fabricate polymeric nano-objects. PISA enables us to prepare polymeric nano-objects in situ during the course of polymerization in concentrated solution (up to 50% w/w), making industrial production of polymeric assemblies in large-scale possible. In this work, reversible addition-fragmentation chain transfer (RAFT) dispersion copolymerization of styrene (St) and N-methacryloxysuccinimide (NMAS) was conducted with poly(2-hydroxyethyl acrylate) (PHEA) as a macro-chain transfer agent (macro-CTA) in methanol. Compared with the PHEA-mediated alcoholic dispersion polymerization of St, RAFT dispersion copolymerization of St and NMAS promoted morphology transition of nano-objects to form higher order morphologies (such as worms and vesicles). Moreover, the introduction of NMAS units into the solvophobic blocks provided functional handles for post-PISA modification of the resultant nano-objects via the active ester-amine reaction. The reaction of 1,6-hexanediamine with NMAS units in P(St- co -NMAS) blocks was conducted to afford cross-linked nano-objects with robust structural stability.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2025
·
IF 6.3
Ran Zhang,Xubo Fan,Xiaoyue Xu,Wenjing Niu,Yuanli Cai
Complex coacervates provide a powerful platform to explore life-like reaction functions. However, the droplet compartmentalization and compartment-specific viscoelasticity control for reaction (in)activation toward life-like functionality and adaptivity are of great challenge. Herein, we present a liquid–liquid phase separation (LLPS) scaffold-client platform for self-adaptable reaction (in)activation under aqueous RAFT conditions in dilution in the presence of air. Self-assembly of dodecyl-containing amphiphilic cationic polyelectrolyte (C12-Polyelectrolyte) leads to the droplet scaffold with compartmentalization into densely-charged C12-rich dense-phase compartments and NHR 3 + -rich dilute-phase compartments, showing extremely high salt-resistance up to 4.5 M NaCl via “salting-out” driven droplet shrinkage. Precise recruitment of anionic aspartic acid acrylamide monomer ( clients ) into dense-phase compartments maintaining liquid dilute-phase compartments, leads to the catalytic coacervates that can activate ultrafast oxygen-tolerant retardation-free photo-RAFT polymerization in < 2 % w/w monomer dilution (98 % conversion in 20 min). Nevertheless, excess monomer recruitment to dilute-phase compartments leads to droplet hardening and droplet-to-lamella transition, resulting in reaction inactivation involving kinetically-trapped retardation and kinetically-frozen inhibition (overnight reaction: 0 % conversion). This self-adaptable reaction (in)activation highlights pivotal roles of droplet compartmentalization and compartment-specific viscoelasticity control in life-like reaction functions, and provides simple guidelines for rational design of catalytic coacervate nanoreactors toward life-like functionality and adaptivity.
研究领域:
高分子化学
·
软物质物理
·
化学生物学
·
纳米反应器
·
合成生物学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2012
·
IF 5.167
Jianbo Tan,Xin Rao,Xionghao Wu,Hancheng Deng,Jianwen Yang,Zhaohua Zeng
A straightforward dispersion polymerization procedure for the synthesis of monodisperse functional polymeric microspheres is proposed in this article. This method overcomes the problems deriving from the highly sensitive nucleation stage by introducing both photoinitiation and a RAFT chain transfer agent to the reaction. The process of the formation and growth of particles in the procedure was investigated and found to be quite different from that in a traditional dispersion polymerization. Various kinds of PMMA-based functional microspheres with high size uniformity were synthesized in a single step by this strategy. The microspheres remained uniform in size, even at concentrations of cross-linker or functional comonomer up to 10 wt %.
研究领域:
高分子化学
·
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2014
·Vol. 55
·期 1
·8-13
·
IF 1.441
Tian Lan,Wenjie Yang,Juan Peng,Mingke Li,Yinghan Wang
The article aimed to decrease the memory effect of polymer dispersed liquid crystals (PDLCs) films, reversible additional-fragmental chain transfer (RAFT) polymerization was used to synthesize RAFT-polystyrene (RAFT-PS), which was a kind of RAFT macroinitiators and used to prepare PDLCs via photo polymerization induced phase separation (PIPS). Different RAFT agents were used to synthesize RAFT-PS. The effect of photoinitiator concentration on the memory effect of these PDLCs was investigated, and the effect of structures of RAFT macroinitiators on the memory effect of the PDLCs was also discussed. The results showed that PDLC films with higher photoinitiator concentration and polymer matrix which had two rigid chains in two ends showed lower memory effect, which could be reduced from 10.9% to 2.5% in this experiment. POLYM. ENG. SCI., 55:8–13, 2015. © 2014 Society of Plastics Engineers
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Flow Chemistry
·
2021
·Vol. 11
·期 4
·867-875
·
IF 2.786
Liu Weiwei,Li Qian,Zhang Yin,Liu Tengfei,Wang Li,Li Huayi,Hu Youliang
Reversible addition-fragmentation chain transfer radical polymerization of styrene and maleic anhydride was successfully performed in continuous-flow microreactor. Results of the structural characterization showed that the obtained styrene-maleic anhydride (SMA) copolymers possessed controlled molecular weight, low dispersity and alternating structures. Subsequently, effects of the polymerization conditions, including reaction pressure, temperature, feed flowrate and tube length, on the polymerization kinetics and molecular structure of the SMA copolymers were investigated in detail. It was found that the reaction rate was increased as the reaction temperature increased within certain limits, as well as the feed flowrate due to the increased mass and heat transfer efficiency. Besides, first-order kinetics of the polymerization was observed when the reaction times were adjusted by only changing the tube length. Good stability was exhibited when the reaction conducted continuously for 10 h. This approach can reduce the reaction time significantly from several hours to about half an hour.
研究领域:
化学工程
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2020
·Vol. 12
·期 4
·545-553
·
IF 5.342
Lingjuan Hu,Qianqian Hao,Linan Wang,Zhe Cui,Peng Fu,Minying Liu,Xiaoguang Qiao,Xinchang Pang
We report the first example of in situ polymer brush growth on the surface of upconversion nanoparticles (UCNPs) in a one-pot near-infrared (NIR) light mediated reversible addition–fragmentation chain transfer (RAFT) polymerization. In the process of polymerization, the surface growth of polymer brushes was realized through an efficient in situ ligand exchange between a photo-activated chain transfer agent (CTA) and the ligand groups on the surface of UCNPs. BF4− was found to be the most efficient ligand in comparison with oleic acid and pyridine. The 980 nm NIR-mediated RAFT polymerization exhibits good temporal control with a low dispersity (Mw/Mn < 1.30), and the thickness of the polymer brushes can be easily adjusted by changing the polymer molecular weight and light exposure time. Moreover, the growth of polymer brushes can proceed even if there is a barrier (e.g. chicken skin) outside the reactor due to the excellent penetration ability of the NIR light.
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）