RSC Advances
·
2014
·Vol. 4
·期 46
·24240-24247
·
IF 3.708
Qun Zhang,Xinde Tang,Tieshi Wang,Faqi Yu,Wenjuan Guo,Meishan Pei
Novel thermo-sensitive zwitterionic ABC-type triblock copolymers poly(ethylene glycol)-block-[2-(methacryloyloxy)ethyl]dimethyl(3-sulfopropyl)-ammonium hydroxide-block-poly[2-(dimethylamino)ethyl methacrylate] (MPEG-b-PSBMA-b-PDMAEMA) were synthesized by atom transfer radical polymerization (ATRP). The bromide-terminated diblock copolymers poly(ethylene oxide)-block-[2-(methacryloyloxy)ethyl]dimethyl(3-sulfopropyl)-ammonium hydroxide (MPEG-b-PSBMA-Br) were prepared by the ATRP of methacryloxyethyl sulfobetaine initiated by the macroinitiator MPEG-Br, which was obtained by the esterification of poly(ethylene glycol) monomethyl ether (MPEG) with 2-bromoisobutyryl bromide. Then, poly(2-(diethylamino)ethyl methacrylate) (PDMAEMA) was introduced by a sequential ATRP process to obtain the triblock copolymers. These copolymers with varied compositions, molecular weights and polydispersities were characterized by 1H NMR and GPC. Variable temperature ultraviolet analysis was employed to test their stimuli-sensitive properties. These block copolymers exhibited distinct thermo-sensitivity under different molecular compositions or solution conditions. The resistance to the non-specific protein adsorption of the triblock copolymers was evaluated, and excellent antifouling property occurred. This can be attributed to surface hydration via hydrogen bonds between PEG and water molecules and the surface hydration via ionic-induction between PSBMA and water molecules. The synergistic effect resulted in an effective reduction of protein adsorption. These copolymers have potential applications as antifouling and antibacterial agents.
研究领域:
材料科学
·
高分子化学
·
生物医学工程
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DOI
高影响因子
Polymer Chemistry
·
2019
·Vol. 10
·期 9
·1150-1157
·
IF 4.76
Shuwen Qu,Ke Wang,Habib Khan,Weifeng Xiong,Wangqing Zhang
Block copolymer nano-assemblies were synthesized via initiators for continuous activator regeneration atom transfer radical polymerization (ICAR ATRP) dispersion polymerization employing the CuBr2/tris(2-pyridylmethyl)amine catalyst in an alcoholic solvent at a relatively low temperature of 45 °C. The typical poly(ethylene glycol)-block-polystyrene (PEG-b-PS) nano-assemblies synthesized via ICAR ATRP dispersion polymerization are compared with those synthesized via RAFT dispersion polymerization under other similar conditions. It is found that the PEG45-b-PS nano-assemblies, e.g., including lamellas, vesicles and vesicular clusters, synthesized via ICAR ATRP dispersion polymerization have very complicated morphologies, which are different from those synthesized via RAFT dispersion polymerization. The reasons leading to the differences are investigated, and it is conclusively supposed that the high Đ of the synthesized BCPs and the salt of the copper catalyst used in ICAR ATRP dispersion polymerization should be involved. This low temperature initiated ICAR ATRP dispersion polymerization is believed to be a valid method to prepare block copolymer nano-assemblies through polymerization-induced self-assembly.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Ruixia Liu,Tingting Ding,Pingping Deng,Xiaofan Yan,Fuquan Xiong,Jienan Chen,Zhiping Wu
To expand the field of high-value utilization of lignin. The degraded deep eutectic solvent lignin-grafted poly (N-Vinyl caprolactam) (DES-lignin-g-PNVCL) was synthesized by modified DES-lignin and NVCL via the combination of activators regenerated by electron transfer-atom transfer radical polymerization (ARGET-ATRP). Fourier transform infrared spectroscopy (FT-IR), 1 H NMR, X-ray electron spectroscopy (XPS), dynamic light scattering (DLS), differential scanning calorimeter (DSC) were used to characterize the structure and performance of DES-lignin-g-PNVCL. The results indicated that the PNVCL and DES-lignin-g-PNVCL were successfully prepared by ARGET-ATRP. The lowest critical solution temperature (LCST) of PNVCL was 35.75 °C. Due to different strength of hydrogen bond , different energies were required, so the LCST of the polymer can be regulated. When the molar ratio of phenolic hydroxyl group in degraded DES-lignin to 2-bromoisobutyryl bromide (BiBB) was increased from 1:1 to 1:7, the grafting rate of DES-lignin-Br was increased from 32.87% to 60.84%, and the LCST of DES-lignin-g-PNVCL was decreased from 47.98 °C to 27.88 °C. The LCST of DES-lignin-g-PNVCL was increased from 30.98 °C to 44.64 °C when the addition amount of DES-lignin-Br was increased from 20 mg to 200 mg. The LCST of DES-lignin-g-PNVCL was increased from 27.20 °C to 39.86 °C when the ratio of DMF/water was increased from 1:4 to 4:1. The LCST of DES-lignin-g-PNVCL was decreased from 52.10 °C to 31.02 °C when the concentration of DES-lignin-g-PNVCL was increased from 0.5 mg/mL to 2.5 mg/mL. The equation represented the relationship between LCST and influencing factors was obtained, the good predictability provided a tactics for preparing desired LCST thermo-responsible polymer.
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2022
·Vol. 7
·期 43
·e202202905
·
IF 2.307
Yazhen Wang,Qing Yang,Liwu Zu,Shaobo Dong,Tianyu Lan
Graphical In this work, we successfully prepared PAM-b-DOPOAA block copolymers using the ATRP method. The analysis showed that the ATRP method can regulate the chain segment length and ratio of the resulting polymer with a narrow molecular weight distribution. The prepared block copolymers can be used as a good flame retardant antistatic agent. Polyacrylamide has been a hot topic of research in recent years, however, the preparation of block copolymers of polyacrylamide using ATRP method has been little studied. In this paper, polyacrylamide with reactive group bromine (PAM−Br) was synthesized by atom transfer radical polymerization (ATRP) using acrylamide (AM) as the monomer and water as the solvent, and polyacrylamide was used as the macromolecular initiator for the next reaction step. Then 9,10-dihydro-9-oxa-10-phosphafi-10-oxide (DOPO) was organically modified to obtain acrylate monomers with DOPO functional groups (DOPOAA), and a mixture of water and N, N-dimethylformamide (DMF) was used as the solvent to obtain PAM-b-DOPOAA block copolymers with controllable molecular mass and narrow molecular mass distribution. The effects of the molecular mass of the macromolecular initiator, polymerization time, and the molar ratio of catalyst to the ligand on the polymerization process were investigated. The structure and properties of the products were also characterized by 1 H-NMR, FTIR, XPS, DSC, TG, etc. The PAM-b-DOPOAA prepared by ATRP method can artificially design the length and ratio of the two chain segments, realizing one additive with two functions and the permanent existence of the function of polymer additives.
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 POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2016
·Vol. 54
·期 13
·2040-2049
·
IF 3.114
Tao Qian,Juanjuan Wang,Tiantian Cheng,Xiaoli Zhan,Qinghua Zhang,Fengqiu Chen
The poly(methyl methacrylate) -b- poly(2-[[[[2-(perfluorohexyl)]-sulfonyl]-amino]ehthyl] methacrylate) (PMMA -b- PC 6 SMA) copolymers were successfully synthesized for the first time using activator regenerated by electron transfer atom transfer radical polymerization (ARGET ATRP) method. Under optimized reaction conditions, the degree of polymerization (DP) of resulting copolymers increased approximately linearly with monomer conversion. Structures of a well-defined block copolymer were determined by GPC, FT–IR, and 1 H-NMR spectra. Results from AFM and contact angle measurements of polymer films revealed the presence of block segments derived from PC 6 SMA, as indicated by the obvious increase in hydrophobicity and oleophobicity. The relationship between surface composition and surface wetting ability was confirmed by XPS and AFM spectra. Compared with the random copolymer PMMA -co- PC 6 SMA, C 6 SMA dosages in the PMMA -b- PC 6 SMA copolymers were greatly decreased, which retained its hydrophobic and oleophobic properties. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016 , 54 , 2040–2049
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
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2012
·
IF 3.456
Wantong Song,Chunsheng Xiao,Liguo Cui,Zhaohui Tang,Xiuli Zhuang,Xuesi Chen
Construction of high density glycosylated surfaces is important in the investigation of interactions between pathogens and surface carbohydrates. In this work, we provided a flexible method for glycosyl surface fabrication by combination of surface-initiated atom transfer radical polymerization (SI-ATRP) and copper-catalyzed azide-alkyne 1,3-dipolar cycloaddition (CuAAC) reaction. Through this strategy, we got a very high surface glycosyl density of about 4 nmol/cm 2 with the surface “click” efficiency of nearly 50%. Then the carbohydrate decorated surfaces were used to mimic cell surfaces and specific recognition of mannose with Escherichia coli was observed. We believe the methodology provided here can be used as a facile way for construction of a wide range of functional biosurfaces.
研究领域:
生物化学
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材料科学
·
微生物学
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Li Dong,Xiangdong Liu,Zhengrong Xiong,Dekun Sheng,Yan Zhou,Changhong Lin,Yuming Yang
Herein, PVDF membranes with excellent UV-absorbing property were first synthesized through grafting the polymerizable low-molecular-weight organic UV-absorber 2-hydroxy-4-(3-methacryloxy-2-hydroxylpropoxy) benzophenone (BPMA) onto α-bromoester-functionalized PVDF membranes via the surface-initiated activator generated by electron transfer atom transfer radical polymerization (SI-AGET ATRP). The surface initiators were immobilized by the reaction between 2-bromoisobutyryl bromide (BIBB) and the hydroxylated PVDF membranes. PVDF-g-PBPMA membranes with different grafting densities were obtained by tuning the polymerization time and the modified membranes were characterized by 1 H-NMR, FT-IR, XPS, SEM, UV–vis Spectrophotometer, TGA and DSC. The experimental results indicated that PBPMA chains were successfully introduced onto PVDF membranes. Most importantly, the PVDF-g-PBPMA membranes exhibited outstanding UV-shielding property. UV–vis transmittance spectra showed that most UV light below 360 nm could be absorbed by PVDF-g-PBPMA membranes and the whole UV light region (200–400 nm) can be blocked with the reaction time increased.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2014
·
IF 2.538
Zhiping Du,Xiaofeng Sun,Xiumei Tai,Guoyong Wang,Xiaoying Liu
Thermosensitive poly(ethylene glycol) methyl ether methacrylate (POEGMA) was grafted on SiO 2 nanoparticles using activators generated by electron transfer atom transfer radical polymerization (AGET-ATRP) technique. The effects of the amount of ligand, catalyst, ascorbic acid and monomer, as well as the reaction temperature and time were systematically investigated and optimized to get a high grafting density. The structure of the hybrid materials was characterized by Fourier transform infrared (FTIR) spectroscopy, and the morphology was characterized by transmission electron microscopy (TEM) observations. Thermosensitive properties of SiO 2 -POEGMA particles were investigated at different grafting densities by turbidity measurements.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
IRANIAN POLYMER JOURNAL
·
2017
·Vol. 26
·期 3
·205-211
·
IF 1.422
Zhou Min-Jie,He Fang,Wu Hu,Wang Guo-Xiang,Liu Li-Chao,Xu Wenyuan
Fe-mediated photo-induced atom transfer radical polymerization (ATRP) of methyl methacrylate was studied with chlorophyll A as photoredox catalyst in the absence of ligands. This is the first report on photo-induced and FeBr 3 -mediated ATRP. A low-cost and environmentally friendly ATRP is provided in this system. A good linear semi-logarithmic plot of polymerization kinetics is the first-order time conversion, and narrow molecular weight distributions explain the well-controlled behavior. The measured number average molecular weight, M
n,GPC (determined by gel permeation chromatography), is increased with monomer conversion, and it is in good agreement with the theoretical values ( M
n,th ). The effect of FeBr 3 is studied with respect to the polymerization. The values of the resultant PMMA increased with reduced FeBr 3 concentration. In this system, the effect of periodic light/off process has been investigated through chain growth instantly turned on and off in response to the visible light. The polymerization was controllable even though the concentration of Fe-based catalyst was dropped to 4 ppm. The chain-end group having a functionality in the synthesized poly(methyl methacrylate) was characterized by nuclear magnetic resonance spectrometry ( 1 H NMR). However, chain extension experiments show reserved chain-end functionality in the synthesized polymers and further confirm the “living” feature of the Fe-mediated photo-induced atom transfer radical polymerization.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Chuanwei Lu,Juan Yu,Chunpeng Wang,Jifu Wang,Fuxiang Chu
Cellulose-rosin based thermoplastic elastomers with UV absorption properties were fabricated by a combination of rosin, poly(butyl acrylate) (PBA) and ethyl cellulose (EC) via “graft from” ATRP with the aid of EC-rosin macroinitiator (EC- g -(DA)-Br) prepared by a simple esterification reaction between EC, dehydroabietic acid (DA, one of rosin’s resin acids) and 2-bromoisobutylryl bromide. The introduction of rosin affords these elastomers with UV absorption property. And the glass transition temperature of these EC-rosin grafted copolymers could be tuned by changing the content of PBA. Moreover, the introduction of PBA to EC endowed EC- g -(DA)- g -PBA with a good film-forming property and excellent thermoplastic elastomer behavior. All of these EC-rosin grafted copolymers showed an excellent UV absorption performance, and maintained outstanding UV absorption capability after continuous UV-irradiation or being heated to 115 °C for 1 h. As a result, these EC-rosin grafted copolymers have a potential application in coating materials with UV absorption property.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
PubMed
高影响因子
IRANIAN POLYMER JOURNAL
·
2020
·Vol. 29
·期 3
·275-286
·
IF 1.707
Shao Ming-lu,Yue Xiang-an,He Jie
To better control the gelation time of in situ polymerization of gel system in reservoir, an activator regenerated by AGET (activator generated by electron transfer) ATRP (atom transfer radical polymerization) initiating system was developed. The AGET ATRP initiating system was composed of an initiator 1,2-dibromoethane, a catalyst ferric chloride and a reducing agent vitamin C, and the effects of these three component proportions on the gelation time and gel viscosity were systematically investigated. Results of bottle tests indicated that the gelation time can even be more than 20 h at 60 °C at optimal concentration ratios. Moreover, the viscosity decreased and the gelation time increased with the increase of salinity and temperature. The gelation time of the core test was 1.5 times or even longer in comparison with that of the bottle test owing to the influences of dilution, adsorption, and rock skeleton isolation. It was also confirmed that the AGET ATRP initiating system can initiate the cross-link gelation of monomers in the core. The enhanced oil recovery result indicated that the oil recovery increased by 9.17% after the gelation of the gelling solutions, and final oil recovery was 40.05%. This research provided a brand-new method to control the gelation time of the in situ polymerization of gel system.
研究领域:
化学工程
·
石油工程
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DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2012
·
IF 3.456
Miao Wang,Jiang Yuan,Xiaobo Huang,Xianmei Cai,Li Li,Jian Shen
Grafting-from has proven to be a very effective way to create high grafting densities and well-controlled polymer chains on different kinds of surfaces. In this work, we aim to graft zwitterionic brush from cellulose membrane (CM) via ARGET-ATRP (Activator Regenerated by Electron Transfer ATRP) method indirectly for blood compatibility improvement. Characterization of the CM substrates before and after modification was carried out by attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), water contact angle measurements, X-ray photoelectron spectroscopy analysis, and atomic force microscopy, respectively. The results demonstrated zwitterionic brushes were successfully grafted on the CM surfaces, and the content of the grafted layer increased gradually with the polymerization time. The platelet adhesion, hemolytic test and plasma protein adsorption results indicated the cellulose membrane had significantly excellent blood compatibility featured on lower platelet adhesion and protein adsorption without causing hemolysis. The functionalized cellulose substrate could have a great potential usage for biomedical applications.
研究领域:
生物材料学
·
医学工程
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）