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Materials Science & Engineering C-Materials for Biological Applications · 2012 ·Vol. 32 ·期 6 ·1699-1703 · IF 2.686

Use of Yb-based catalyst for AGET ATRP of acrylonitrile to simultaneously control molecular mass distribution and tacticity

Jing Ma,Hou Chen,Min Zhang,Chunhua Wang,Ying Zhang,Rongjun Qu

Yb-based catalyst was used for the first time for atom transfer radical polymerization using activators generated by electron transfer (AGET ATRP) of acrylonitrile (AN) with 2-bromopropionitrile (BPN) as initiator, 2, 2′-bipyridine (bipy) as ligand, and tisn(II) bis(2-ethylhexanoate) (Sn(EH) 2 ) as reducing agent in the presence of air. With respect to AGET ATRP of AN catalyzed by CuBr 2 , an evident increase of polymer tacticity was observed for AGET ATRP of AN. The increase of syndiotacticity became more and more pronounced than the increase of isotacticity of polyacrylonitrile (PAN) along with YbBr 3 content. The block copolymer PAN-b-PMMA with molecular weight at 60,000 and polydispersity at 1.36 was successfully prepared.

研究领域: 高分子化学 · 材料科学 · 催化化学 · 聚合物合成 · 功能材料

✓ 已验证 DOI 高影响因子

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JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY · 2012 ·Vol. 50 ·期 24 ·4995-4999 · IF 3.919

SET-LRP of acrylonitrile catalyzed by tin powder

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 · 聚合反应 · 功能高分子 · 材料化学 · 有机合成

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JOURNAL OF APPLIED POLYMER SCIENCE · 2015 ·Vol. 132 ·期 25 · IF 1.768

Rapid ambient temperature living radical polymerization of methyl methacrylate and styrene utilizing sodium hypophosphite as reducing agent

Xiao-Hui Liu,Fei-Jun Zhang,Hui-Na Li,Xiao-Hui Hu,Wen-Li Di,Shuang Zhao

A facile, safe, and inexpensive reducing agent, sodium hypophosphite (NaH 2 PO 2 ·H 2 O), has been successfully used to perform ambient temperature living radical polymerizations of methyl methacrylate (MMA) and styrene (St). The rapid radical polymerizations were readily obtained at 25°C, i.e., MMA reached a conversion of ca 90% after 2.5 h, and St reached a conversion of ca 80% after 40 h. The polymerizations of MMA and St exhibited excellent living/controlled nature, as evidenced by pseudo first-order kinetics of polymerization, linear evolution of molecular weights with increasing monomer conversions, and narrow molecular weight distributions. The various experimental parameters—ligand, solvent, and molar ratio of NaH 2 PO 2 ·H 2 O to CuSO 4 ·5H 2 O—were varied to improve the control of polymerization, molecular weight, and molecular weight distribution. 1 H NMR analyses and chain-extension reactions confirm the high chain-end functionality of the resultant poly(methyl methacrylate) and polystyrene. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42123.

研究领域: 高分子化学 · 聚合反应工程 · 功能高分子材料 · 可控/活性聚合 · 绿色合成方法

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Use of Yb-based catalyst for AGET ATRP of acrylonitrile to simultaneously control molecular mass distribution and tacticity

SET-LRP of acrylonitrile catalyzed by tin powder

Rapid ambient temperature living radical polymerization of methyl methacrylate and styrene utilizing sodium hypophosphite as reducing agent