MATERIALS SCIENCE FORUM
·
2020
·
IF 0
Zheng Li,Zi Jian He,Ying Cheng Zhou,Yi Tang,Yu Fang Chen,Tao Jin
In this paper, Dimethyl sulfoxide (DMSO) was used in the activating process of cotton filter cloth to improve its further hydrophobic modification reaction between cotton fabric and 1-octadecene via an electron transfer (ARGET) atom transfer radical polymerization (ATRP) mechanism. The major influences of DMSO on ARGET-ATRP process was discussed, and meanwhile, the microstructure changes, morphology feature and performance characteristics of cotton filter cloth during the reaction was explored by the SEM, AFM, EDS, XRD and TGA techniques.The result shows that DMSO can leads to cotton fibers adhesion and surface roughening under the ARGET-ATRP grafting reaction conditions, but has little changes on the crystal form, crystallinity and thermal properties of cellulose. At a DMSO dosage of 10%, the hydrophobically modified cotton filter cloth has a water contact angle (CA) of up to 141°. While naturally placed for 1 hour, the CA of hydrophobically modified cotton filter cloth can be stable at 116° with a decay rate of 17.5%, which proves that the hydrophobic stability of cotton filter cloth has been improved markedly. Furthermore, a better improvement for the hydrophobic stability of cotton filter cloth will significantly enhance the application of hydrophobic functional modified cellulosic materials.
研究领域:
材料科学
·
纺织工程
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DOI
JOURNAL OF POLYMER SCIENCE
·
2025
·
IF 3.6
Shufang Wu,Zhiqian Long,Yushu Zhang,Ting Zhang,Qinghong Luo,Xiaoxuan Liu,Zhiquan Li
Using low catalyst loadings while maintaining precise polymer property control is a critical challenge in the O-ATRP field. Herein, we report a novel O-ATRP system utilizing 1-bromopyrene (Py-Br) as a photoredox catalyst, enabling controlled polymerization of methyl methacrylate (MMA) at an ultra-low loading of 10 ppm. When combined with ethyl α -bromophenylacetate (EBPA) as an initiator, this system produces polymers with a molecular weight distribution of 1.48 and an initiation efficiency of 66.7%. Mechanistic studies, including UV–Vis spectroscopy, fluorescence spectroscopy, cyclic voltammetry, and time-resolved fluorescence measurements, elucidate the photophysical and photochemical properties of Py-Br in O-ATRP. Kinetic analyses reveal first-order polymerization kinetics, while the linear increase of molecular weight with monomer conversion and low dispersity values indicate good control over the polymerization. The living nature of the system is further confirmed through successful chain extension experiments. This Py-Br-catalyzed O-ATRP system explores the feasibility of conducting polymerization at lower catalyst concentrations, offering insights into approaches for reducing catalyst usage in polymer synthesis. Graphical Photoinduced metal-free ATRP of MMA using ppm-level Py-Br as the organic photocatalyst.
研究领域:
高分子化学
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材料科学
·
光催化
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产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Shuangshuang Wang,Jixuan Song,Yuchao Li,Xingchuan Zhao,Lin Chen,Guang Li,Liping Wang,Zhengfeng Jia,Xiangcai Ge
An environmentally benign and convenient approach to impart titanium (Ti) surfaces with antibacterial functionalities was described in this work. Polydopamine (PDA) was first deposited onto an alkali activated Ti substrates. Then 2-bromoisobutyryl bromide (BIBB) was immobilized on the surface of PDA coated Ti. Finally, the BIBB functionalized Ti initiated the polymerization of N, N -diethylaminoethyl methacrylate (DEAEMA) and N, N -dimethylaminoethyl methacrylate (DMAEMA) to obtain Ti@PDA-g-polymer brushes by activators regenerated by electron transfer atom transfer radical polymerization (ARGET-ATRP). The prepared PDEAEMA and PDMAEMA brushes on Ti surfaces would be subsequently quaternized by using 1-bromooctane, which would impart the obtained products with quaternary ammonium groups. The surface compositions of the functionalized Ti were characterized by X-ray photoelectron spectroscopy (XPS). The hydrophilic/hydrophobic properties of the functionalized Ti surfaces were determined by static water contact angle measurements, and morphologies were characterized by scanning electron microscope (SEM). Antibacterial abilities of quaternized PDEAEMA and PDMAEMA coated Ti were evaluated by the contact killing test, in which live/dead cell staining method was employed. The results showed that the quaternized polymer decorated Ti exhibited good bactericidal effects against Escherichi coli ( E. coli ), and its inhibition rate of E. coli were observed to be nearly 90%.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Yejun Luo,Suqin Deng,Zheng Li,Lijiu Cao,Yuan He,Yufang Chen,Tao Jin
Hydrophobic modified cotton filter fabric is a key material in the chemical industry, as it is used in common industrial filtration and precision separation processes. Most studies have focused on improving the hydrophobicity of cotton filter fabric. However, the hydrophobic durability, which is the most critical factor that determines the application scope of the material, remains unaddressed. Herein, we report that CS 2 activation and subsequent 1-octadecene graft copolymerization via ARGET-ATRP of the cotton filter fabric leads to a modified material that is largely superior to the traditional cotton filter fabric. The modified cotton filter fabric exhibits high hydrophobicity, with an initial water contact angle of 141.0° and excellent hydrophobic durability, as demonstrated by the residual water contact angle of 126.7° after a 150 min droplet holding time. Moreover, the modified hydrophobic sample fabric was resistant to a variety of physical stresses and chemicals, maintaining its hydrophobic properties following multiple resistance tests, such as immersion in oily water for 10 days, immersion in organic solvents for 72 h, or when subjected to UV radiation for 24 h.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
E-POLYMERS
·
2015
·Vol. 16
·期 1
·41-47
·
IF 0.569
Xue-Hui Zhan
The initiators for continuous activator regeneration (ICAR) atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) were investigated in microemulsion under light irradiation with ethyl 2-bromoisbutyrate (EBiB) as an ATRP initiator, ferric chloride hexahydrate (FeCl 3 ·6H 2 O) as a catalyst, N,N,N′,N′-tetramethyl-1,2-ethanediamine (TMEDA) as a ligand, and azobisisobutyronitrile (AIBN) as an initiator and reducing agent. The linear dependence of ln([M] 0 /[M]) on polymerization time was observed, indicating that the polymerization was living polymerization. Furthermore, the number-average molecular weights (Mn), gel permeation chromatography (GPC) and molecular weight distributions (MWD) of the PMMA obtained from GPC were controlled. The product was characterized by 1 H nuclear magnetic resonance (NMR) and GPC. The living features were verified by chain-extended with MMA with the obtained PMMA as macroinitiator.
研究领域:
高分子化学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 133
·期 1
·
IF 1.768
Caideng Yuan,Mingtong Cui,Longlong Feng,Jingpeng Wang,Yan Peng
An amino-functionalized nano-adsorbent (DETA-MNPs) was prepared by a process involving: (1) synthesis of superparamagnetic Fe 3 O 4 nanoparticles; (2) introduction of amino groups after which ATRP initiator was anchored; (3) grafting of glycidyl methacrylate (GMA) via SI-ATRP; and (4) ring-opening reaction of epoxy groups with diethylenetriamine (DETA). The nano-adsorbent was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), transmission electron microscope (TEM), and vibrating sample magnetometer (VSM) and applied to remove Cu(II) in batch experiments. The effects of pH, Cu(II) concentrations, solution ionic strength, and contact time were investigated. The results show that the DETA-MNPs are spherical with cubic spine structure, high saturation magnetization (41.9 emu g −1 ), and an average diameter of 10 nm. The maximum Cu(II) adsorption capacity achieves 83.33 mg g −1 at pH 5.0 by Langmuir model. The adsorption process is highly pH-dependent and reaches equilibrium within 20 min. Furthermore, the DETA-MNPs exhibit excellent dispersibility and reusability. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 132 , 42859.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
E-POLYMERS
·
2019
·Vol. 19
·期 1
·323-329
·
IF 1.491
XianRong Shen,DengZhou Xia,YiXin Xiang,JianGang Gao
In this paper, γ-valerolactone (GVL), a bio-based polar solvent, was applied as green solvent for iron(III)-catalyzed AGET ATRP without any external ligand. GVL is a fully degradable, non-toxic green solvent and has complex ability to iron halide complexes through –OCO- group. GVL as the solvent and the ligand for AGET ATRP of MMA in a controlled manner, as proved by kinetic study, the low PDI values and the increase in polymer molecular weight versus monomer conversion. Chain re-initiation experiments and 1 HNMR characterization were conducted to further confirm the living feature. Graphical
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
Polymer Chemistry
·
2017
·Vol. 8
·期 41
·6407-6415
·
IF 5.375
Ke Wang,Yixin Wang,Wangqing Zhang
Diblock copolymer nano-assemblies of poly(2-hydroxypropyl methacrylate-b-benzyl methacrylate) (PHPMA-b-PBzMA) were synthesized by initiators for continuous activator regeneration atom transfer radical polymerization (ICAR ATRP) using the CuIIBr2/tris(pyridin-2-ylmethyl)-amine (TPMA) complex as a catalyst under dispersion conditions and were compared with those obtained by RAFT dispersion polymerization. It is found that these two kinds of polymerizations afford good control, as indicated by the linearly increasing molecular weight with monomer conversion and the narrow molecular weight distribution, whereas the ICAR ATRP runs a little faster than RAFT. In the two cases of dispersion polymerization, the morphologies of the PHPMA-b-PBzMA nano-assemblies are similar to each other and change from spheres to wormlike aggregates with block extension, whereas the size of the nano-assemblies by ICAR ATRP is usually larger than those obtained by RAFT. The degree of polymerization (DP) of the poly(2-hydroxypropyl methacrylate) and poly(benzyl methacrylate) blocks affecting the size and/or morphology of the PHPMA-b-PBzMA nano-assemblies is investigated, and the reason for the larger size of the PHPMA-b-PBzMA nano-assemblies by ICAR ATRP is discussed.
研究领域:
高分子化学
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材料科学
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2019
·Vol. 21
·期 10
·2759-2770
·
IF 9.405
Chuanwei Lu,Chunpeng Wang,Juan Yu,Jifu Wang,Fuxiang Chu
Photoinduced metal-free “grafting from” atom transfer radical polymerization (ATRP) has been successfully applied to the fabrication of renewable cellulose graft copolymers with the aid of 2-bromo-2-phenylacetyl ester-modified ethyl cellulose as the macroinitiator. In the presence of an organic-based photoredox catalyst, “grafting from” polymerization of lauryl methacrylate from ethyl cellulose was efficiently activated and deactivated with UV irradiation, resulting in good control over molecular weight. 1H NMR and MALDI-TOF MS confirmed highly preserved Br chain-end functionality. Furthermore, cellulose graft copolymers with a block side chain architecture were successfully prepared through chain extension by metal-free “grafting from” ATRP. We believe that this work will provide a novel approach to design well-defined cellulose graft copolymers and further expand their application fields.
研究领域:
高分子化学
·
生物材料
·
绿色化学
·
功能高分子
·
可持续材料
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DOI
高影响因子
POLYMER SCIENCE SERIES B
·
2016
·Vol. 58
·期 3
·313-320
·
IF 0.737
Guo Yanjuan,Liu Weiqu
A series of fluorinated diblock copolymers poly(2,2,3,4,4,4-hexafluorobutyl methacrylate)- b -poly(glycidyl methacrylate) PHFMA- b -PGMA with different fluorine content were synthesized by activator generated by electron transfer atom transfer radical polymerization (AGET ATRP). FTIR, 1 H NMR and GPC data verified feasibility and controllability of the synthesis. In order to evaluate the effect of chain structure on the surface properties, corresponding homopolymer poly(2,2,3,4,4,4-hexafluorobutyl methacrylate) and random copolymer copoly(2,2,3,4,4,4-hexafluorobutyl methacrylate- r -glycidyl methacrylate) were also comparatively studied. Contact angle measurements indicated that the water and ethyleneglycol contact angles of block- and random copolymers increased with increase of fluorine content, but in different manner. This difference comes from different surface energy at the same fluorine content on film surface. The surface stability of block-copolymer was obviously better than that of random copolymer; the same results were observed in heat resistance tests.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2011
·
IF 1.795
Jing Yuan,Jian-qiang Meng,Yin-lin Kang,Qi-yun Du,Yu-feng Zhang
This paper describes a facile and novel approach for the surface glycosylation of poly(vinylidene difluoride) (PVDF) microporous membrane. A glycopolymer poly( d -gluconamidoethyl methacrylate) (PGAMA) was tethered onto the membrane surface via activators generated by electron transfer atom transfer radical polymerization (AGET ATRP) directly initiated from the PVDF surface. Chemical changes of membrane surface were characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). It was revealed that PGAMA was successfully grafted onto the membrane surface and its grafting density can be modulated in a wide range up to 2.4 μmol/cm 2 . The effects of glycosylation on membrane morphology, flux and surface hydrophilicity were investigated. Field emission scanning electron microscopy (FESEM) results indicated shrinkage of the surface pore diameters and the growth of the glycopolymer layer on the membrane surface. The static water contact angle (WCA) of the membrane surface decreased from 110° to 30.4° with the increase of grafting density, indicating that the PGAMA grafts dramatically improved the surface hydrophilicity. The protein adsorption and platelets adhesion experiments indicated that the grafted PGAMA could effectively improve the membrane antifouling property and biocompatibility.
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 POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2014
·Vol. 52
·期 7
·1020-1027
·
IF 3.245
Danfeng Yang,Dan He,Yonggui Liao,Zhigang Xue,Xingping Zhou,Xiaolin Xie
The polar solvents, N -methylpyrrolidone (NMP), N , N -dimethylformamide (DMF), and acetonitrile (CH 3 CN) were used as ligands for iron(III)-mediated activators generated by electron transfer atom transfer radical polymerizations (AGET ATRPs) of methyl methacrylate (MMA) with various initiators and reducing agents. Polymerizations were conducted with a molar ratio of [MMA] 0 /[initiator] 0 /[FeBr 3 ] 0 /[reducing agent] 0 = 100:1:1:0.5 and a volume ratio of MMA/solvent = 2:1 at 60 °C to investigate the effects of initiator, solvent and reducing agent, and most of the systems showed the typical features of “living”/controlled radical polymerization. In order to get a deeper understanding of the mechanism, the amount of the reducing agent was changed to study the polymerization behavior. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014 , 52 , 1020–1027
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）