Effect of a combination of hexamethylphosphoramide and alkyl alcohol on the stereospecificity of radical polymerization of N-isopropylacrylamide

被引：8

作者：

Hirano, Tomohiro ^{[1
]}

Morikami, Akihiro ^{[1
]}

Fujioka, Yasuhiro ^{[1
]}

Ute, Koichi ^{[1
]}

机构：

[1] Univ Tokushima, Dept Chem Sci & Technol, Inst Sci & Technol, Tokushima 7708506, Japan

来源：

POLYMER | 2011年 / 52卷 / 03期

关键词：

Hydrogen bonding; N-Isopropylactylamide; Stereospecific radical polymerization; HYDROGEN-BOND; SYNDIOTACTIC-SPECIFICITY; POLY(N-ISOPROPYLACRYLAMIDE); TEMPERATURE; TACTICITY;

D O I：

10.1016/j.polymer.2010.12.035

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Radical polymerization of N-isopropylacrylamide (NIPAAm) was investigated at low temperatures in the presence of both hexamethylphosphoramide (HMPA) and alkyl alcohols. Although HMPA and alkyl alcohols separately induced syndiotactic specificity in NIPAAm polymerization in toluene at low temperatures, a combination of HMPA and less bulky alkyl alcohols, such as methanol and ethanol, was found to induce isotactic specificity at -80 degrees C. NMR analysis of mixtures of NIPAAm, ethanol and HMPA suggested the formation of a 1:1:1 complex through O-H center dot center dot center dot O=C and N-H center dot center dot center dot O=P hydrogen bonding. It is believed that the steric effect of HMPA enhanced by cooperative hydrogen bonding was responsible for the combined effect of HMPA and alkyl alcohols in inducing isotactic specificity. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：629 / 634

页数：6

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