POLYMER BULLETIN
·
2021
·Vol. 79
·期 2
·1057-1068
·
IF 2.87
Zhang Yue-Fei,Tang Jian,Li Tao,Liu Yun,Li Yan
In this paper, the polymerization of acrolein (A) via UV-mediated atom transfer radical polymerization (ATRP) is reported. The optimization of the experimental conditions of the polymerization is investigated, and it shows that dimethyl sulfoxide as solvent, ethyl 2-bromoisobutyrate (EBIB) and fluorescein (FL) as catalyst, and [A] 0 /[EBIB] 0 /[FL] 0 = 200/1/0.1 in the period of 5 h at 47 °C are suitable conditions for the reaction. In this way, the yield of the polymer is 24.5%. The glass transition temperature and melting point of polyacrolein characterized by differential scanning calorimetry are 115.5 °C and 165.7 °C, respectively. At low conversion, the polymerization conforms to be the first-order kinetics reaction. The dependence of polymerization on light source is proved by “on/off” light source experiment. In short, this study opens up a new way for the ATRP of acrolein, and the polyacrolein with abundant aldehyde groups can be used in the fields of biomedical labeling, immobilization carrier and adsorption of organic amines. Graphic abstract
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 48
·23338-23343
·
IF 3.925
Chenhan Yu,Xinyi Feng,Qiuyu Li,Jiahui Peng,Yu Xiang,Yanting Song,Haoyu Feng,Yunye Huang,Longqiang Xiao,Linxi Hou
Photo-induced controlled radical polymerization (CRP) mediated by heterogeneous catalysts provides excellent spatiotemporal control and has been widely studied in view of green chemistry and potential biomedical applications. In this paper, an ionic heterogeneous catalyst (TD-I) was synthesised in a facile manner under mild conditions for inducing the reversible complexation-mediated polymerization (RCMP) of poly (polyethylene glycol monomethyl ether methacrylate) (PPEGMA) in an aqueous solution under white LED light irradiation. The obtained PPEGMA has a controllable molecular weight and a narrow molecular weight distribution. The spatio-temporal control of the catalytic system and the high chain end fidelity of the polymer have been successfully verified by on-off light experiments and chain expansion experiments. The activity and efficiency of TD-I remained essentially unchanged after being used for three cycles. Such a heterogeneous photocatalyst which can be easily separated and efficiently reused is promising for industrial applications.
研究领域:
材料科学
·
绿色化学
✓ 已验证
DOI
高影响因子
POLYMER BULLETIN
·
2021
·Vol. 79
·期 3
·1751-1765
·
IF 2.87
Sun Yiwen,Zhai Guangqun
Since cerium(IV) ammonium nitrate (CAN) could oxidize amidyl N–H moieties into nitrogen-centered radicals under proper conditions to initiate radical polymerization, CAN-acrylamide (AAm) redox-initiated radical homo/co-polymerization in a conventional or controlled manner was exploited with AAm as an intrinsically reducing inimer. CAN oxidized AAm to initiate conventional radical homopolymerization at 50–60 °C, and viscosity-average molecular weight (MW) of polyacrylamide (PAAm) steadily increased with conversion because of the oxidation of amidyl N–H moieties of in-chain -AAm- units, but MW was in a range from 10 4 to 10 5 . CAN-AAm redox-initiated radical co-polymerization of N,N -dimethylacrylamide (DMAAm) proceeded readily under optimized conditions and formed PAAm-co-PDMAAm with MW in a range from 10 5 to 10 6 , and increasing simultaneously with conversion. CAN-AAm redox-initiated controlled radical homopolymerization was performed with FeCl 3 complexes as the deactivator, and the polymerization proceeded in a mechanism of reverse atom transfer radical polymerization (ATRP) and MW of PAAm increased in proportion to conversion. The PAAm chains contained a C–Cl terminal, which was confirmed by block co-polymerization with DMAAm via standard ATRP with PAAm as the macro-initiator.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yunchao Yang,Wenlin Cai,Maomao He,Zhiyuan Ma,Jie Liu,Wen Sun,Yang Li,Xuefei Leng
Polystyrene (PS) is widely used in products such as food packaging materials and medical devices, but it lacks inherent antibacterial properties. Organic antibacterial monomers exhibit better compatibility with the PS matrix and higher biosafety compared to inorganic antibacterial agents. However, PS, as a thermoplastic resin, typically requires thermal processing, whereas organic antibacterial monomers generally demonstrate poor thermal stability at elevated temperatures. Herein, a novel heat-resistant antibacterial monomer [16C] was synthesized, which possesses a rigid benzene ring structure and an imidazole ring structure, contributing to an excellent thermal decomposition temperature ( T d,5% >300°C). At the thermal processing temperature (220°C) of PS, the mass loss of [16C] was merely 1.61% after 10 min, and even after extending the duration to 30 min, the mass loss did not exceed 5%, demonstrating its superior thermal stability. The hyperthermostable antibacterial monomer was covalently bonded to PS resin through a simple free radical polymerization process, resulting in the fabrication of PS resin with inherent antibacterial properties (PS16Cs). Antibacterial testing of the thermally processed PS16Cs confirmed that the antibacterial activity remained highly effective even after exposure to high temperatures. Comprehensive testing indicated that the mechanical and thermal properties of the synthesized antibacterial PS resin met the commercial standards for PS. Notably, PS16Cs maintained durable and stable antibacterial activity even after prolonged immersion (in deionized water or phosphate-buffered saline) and repeated washing. Furthermore, it exhibited excellent biocompatibility after exposure to complex environments (varying pH, temperature, and detergent conditions), making it a viable material for applications in food packaging, electronic housings, and medical devices. This study developed a highly thermally stable antibacterial monomer, providing a novel approach for the organic antibacterial modification of polystyrene resin.
研究领域:
材料科学
·
生物医学工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2021
·Vol. 13
·期 2
·182
·
IF 4.329
Shuo Zeng,Jinwei Shi,Anchao Feng,Zhao Wang
This study aimed to modify an electrospun regenerated cellulose (RC) nanofiber membrane by surface grafting 2-(dimethylamino) ethyl methacrylate (DMAEMA) as a monomer via atom transfer radical polymerization (ATRP), as well as investigate the effects of ATRP conditions (i.e., initiation and polymerization) on enzyme immobilization. Various characterizations including XPS, FTIR spectra, and SEM images of nanofiber membranes before and after monomer grafting verified that poly (DMAEMA) chains/brushes were successfully grafted onto the RC nanofiber membrane. The effect of different ATRP conditions on laccase immobilization was investigated, and the results indicated that the optimal initiation and monomer grafting times were 1 and 2 h, respectively. The highest immobilization amount was obtained from the RC-Br-1h-poly (DMAEMA)-2h membrane (95.04 ± 4.35 mg), which increased by approximately 3.3 times compared to the initial RC membrane (28.57 ± 3.95 mg). All the results suggested that the optimization of initiation and polymerization conditions is a key factor that affects the enzyme immobilization amount, and the surface modification of the RC membrane by ATRP is a promising approach to develop an advanced enzyme carrier with a high enzyme loading capacity.Keywords:electrospinning;atom transfer radical polymerization;nanofiber membrane;enzyme immobilization
研究领域:
生物材料学
·
酶工程
✓ 已验证
DOI
PubMed
高影响因子
RADIATION PHYSICS AND CHEMISTRY
·
2018
·
IF 1.435
Qing Li,Wenhui Fan,Tao Yang,Junhui Wang,Liang Hu,Weiwei He,Wanxin Wen,Hanzhou Liu
Irradiation-assisted self-assembly after free-radical polymerization (ISFP) method is a simple and novel one-pot synthetic strategy to prepare polymer microspheres. Herein, various alkenyl aromatic polymer microspheres were prepared by ISFP method. The relationship between the microsphere structure and monomers was researched by various experimental methods including the monomer activity, chemical structure and steric hindrance. The result shows that the uniform microspheres cannot be well prepared by monomers with too high or too low monomer activity. The desired alkenyl aromatic microspheres with certain size can be synthetized by choosing moderate activity and cis- / trans-isomers.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
AICHE JOURNAL
·
2020
·Vol. 66
·期 7
·e16245
·
IF 3.519
Chao Bian,Yin-Ning Zhou,Zheng-Hong Luo
To control over molecular weight and its distribution in bulk controlled radical polymerization (CRP) at high conversion remains a challenge. Currently, there are few reports about bulk CRP regulated by external field. In this work, a new strategy combining external fields of light and ultrasound, namely double-external-field, is reported to overcome the challenge. Light irradiation directly reduces the deactivator Cu II Br 2 /L in the presence of free amine ligand, while ultrasonic agitation improves the homogeneity of the system and moderates the diffusional limitations on activation-deactivation and termination processes. Bulk polymerizations of methyl acrylate (MA) were conducted in a controlled manner at conversion over 90%, producing PMA with low dispersities ( Đ = 1.05–1.07) and good retention of chain-end functionality (77%). In addition, good control over the polymerizations for methyl methacrylate (MMA) and styrene was obtained, although the chain-end functionality of PMMA-Br requires further improvement. It is believed that this as-developed double-external-field regulation strategy is also applicable to other light induced bulk RDRP systems to improve the controllability.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2018
·
IF 3.741
Teng Xue,Erjun Tang,Xiaofeng Guo,Ruihong Wang,Lei Zhao,Jian Zhou,Shaojie Liu
The ionic liquid 1-(triethylene-tetramine)ethyl-3-methyl chloride ([N 4 MIM]Cl) was first prepared to replace the organic ligand coordinating with CuBr to catalyze atom-transfer radical polymerization (ATRP) in ionic liquid system. [N 4 MIM]Cl was synthesized via the intermediate IL 1-chloroethyl-3-methyl chloride ([CeMIM]Cl) reacting with the aliphatic amine triethylene tetramine (TETA) and [CeMIM]Cl) was obtained by N′-alkylation of N -methylimidazole with 1,2-dichloroethane. This catalyst has been applied to the ATRP of methyl methacrylate (MMA) in the ionic liquid (IL) 1-allyl-3-methylimidazolium chloride ([AMIM]Cl) and presented a perfect catalytic performance. The chemical structures of the ILs obtained were confirmed by FTIR and 1 H NMR. The coordination ability of [N 4 MIM]Cl was assessed by cyclic voltammetry (CV) and its coordination mechanism towards CuBr was discussed. The [N 4 MIM]Cl/CuBr catalyst system showed good controllability in the aforementioned ATRP reaction in [AMIM]Cl. The amount of residual Cu 2+ in the polymer product was determined by atomic absorption spectrometry (AAS) and the result showed that the Cu catalyst was easily separated from the obtained polymer. Thus, the coordinating IL could overcome the shortcomings of traditional organic ligands, such as poor compatibility with IL media resulting in the weakly catalytic performance and inferior separation of the catalyst from the polymer. It implied that the coordinating ionic liquid ([N 4 MIM]Cl) has highly promising application in the ATRP of ionic liquid system.
研究领域:
材料化学
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Yang Liu,Shanshan Liang,Yinghui Qian,Hao-Ran Zuo,Ming Duan
In order to recover dyes from practical dye wastewater through loose nanofiltration (NF) membranes, dyes are supposed to be rejected through synergetic effect of sieving and Donnan repulsion while salts are supposed to permeate through membrane under weakened synergetic effect of sieving and Donnan repulsion. Therefore, redox system initiated interfacial radical polymerization was applied to form an integrated negatively charged separation layer with average pore size of 2.2 nm. The surface potential of −50 mV at pH ≥ 7 was achieved by plenty of –CN, O–C=O, and C–O–C groups. As the results, permeability of 43.1 L/(m 2 h bar) and rejection of 99 % to MB for loose NF membrane (PAN-C) was obtained when treating 50 ppm MB aqueous solution under 2 bar, while only rejection of 5.2 % to MO was obtained, confirming the successful separation of MO from MB. Furthermore, the separation factor of MB over Na 2 SO 4 and MgSO 4 for PAN-C were 261 and 420, respectively, verifying the potential of PAN-C in application to dyestuff effluent treatment. In addition, PAN-C showed excellent anti-fouling performance with FRR of 0.99 against HA. Overall, this work established a new method to fabricate high performance loose NF membranes designed at molecular level, which could be extended to reverse osmosis , forward osmosis, and other membrane processes.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Haifeng Wang,Jiayu Peng,Yiqing Yao,Zhijie Liang
A novel pre-synthesized polymer is fabricated with sodium polyacrylate and acrylic acid through free radical polymerization . Interestingly, the pre-synthesized polymer is further polymerized on the polyester-cotton fabric in the presence of glycerol as a cross-linking agent forming superabsorbent fabric. The composite functional fabrics is prepared by two steps, namely synthesis and finishing process. Owing to the vital role of the viscosity of pre-polymer for the superabsorbent property, the effect of monomer concentration , temperature, time, dosage of initiator and degree of neutralization on the viscosity of pre-polymer is thoroughly investigated. Besides, the effects of the degree of neutralization and dosage of polymerization solution as well as cross-linking agent on the water absorption of the composite and unfinished polyester-cotton blended fabrics is compared, respectively. After treatment, the water absorption capacity increases from 1 to 323.52 g/g in 1 h, reaching a maximum value of 417.53 g/g after 3.5 h. Besides, the water transportation obeys a Fickian diffusion mechanism. Furthermore, the composite fabric exhibits an optimum water retention capacity of up to 4 h. This speedy and super-water-absorbing material exhibits great potential in practical applications, such as in sanitary articles, wound dressings, and soil moisture.
研究领域:
材料科学
·
纺织工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 134
·期 1
·
IF 1.866
Shaojie Liu,Huali Wang,Xiaomeng Chu
2,2,6,6-Tetramethylpiperidinyloxyl (TEMPO)-containing polymer brushes were grafted onto crosslinked polystyrene microspheres via surface-initiated activators regenerated by electron transfer atom transfer radical polymerization (ARGET ATRP) of 2,2,6,6-tetramethyl-4-piperidyl methacrylate, followed by an oxidation process with 3-chloroperoxybenzoic acid as oxidant. The synthesized nitroxide polymer brushes included homopolymer brushes, block copolymer brushes, and random copolymer brushes with various TEMPO contents and molecular weights. They were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, nuclear magnetic resonance spectroscopy, and gel permeation chromatography. These nitroxide brushes bearing high TEMPO contents were used as recoverable catalysts for the hypochlorite and aerobic oxidation of primary alcohols to aldehydes. The effects of polymer brush structure on the catalytic properties were studied and discussed. The results showed that these nitroxide polymer brushes had excellent catalytic properties and good recycling performances. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 44365.
研究领域:
高分子化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2016
·
IF 4.179
Rui Liu,Wan-Fen Pu,Dai-Jun Du
A novel core–shell polymer (HBAPAM) with functionalized nano-SiO 2 as core, multibranched associative polymeric chains as shell was synthesized through in-situ free radical polymerization strategy. TGA, IR, 1 H NMR, and SEM proved the notion and method of preparing of HBAPAM was applicable. The core–shell structure and multibranched morphology enhanced the supramolecular interaction of HBAPAM, which displayed the desirable viscosified efficiency and viscoelasticity, especially, long-term stability in harsh temperature and salinity condition. HBAPAM featured the rheology in multiscale consistently in deionized water and formation water. Core flooding experiments confirmed that HBAPAM had high cost performance in the variable permeability of oilfields.
研究领域:
材料科学
·
石油工程
✓ 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）