A sol-gel reaction of vinyl polymers based on thermally reversible urea linkages

被引：20

作者：

Chang, JY ^{[1
]}

Do, SK

Han, MJ

机构：

[1] Seoul Natl Univ, Coll Engn, Sch Mat Sci & Engn, Seoul 151742, South Korea

[2] Seoul Natl Univ, Coll Engn, Hyperstructured Organ Mat Res Ctr, Seoul 151742, South Korea

[3] Ajou Univ, Dept Mol Sci & Technol, Suwon 442749, South Korea

来源：

POLYMER | 2001年 / 42卷 / 18期

关键词：

sol-gel reaction; imidazole; isocyanate;

D O I：

10.1016/S0032-3861(01)00270-1

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A thermally reversible cross-linking reaction of vinyl polymers was investigated. Poly(4-vinylimidazole-co-methyl methacrylate) (2) and poly(3-isopropenyl-alpha,alpha (1)-dimethylbenzyl isocyanate-co-methyl methacrylate) (6) were prepared by radical copolymerization. Gelation was observed in a few minutes by mixing polymer solutions of 2 and 6 in DMF at room temperature. A clear solution was produced at high temperatures. Reversible formation of urea bonds in the reaction was confirmed by IR spectroscopy. No significant side reaction was observed under argon when the reaction was run repeatedly. In the model reaction of 4-vinylimidazole with 3-isopropenyl-alpha,alpha -dimethylbenzyl isocyanate in DMF-d(7), equilibrium constants were calculated at various temperatures by H-1 NMR spectroscopy. DeltaH(0) of -56 kJ mol(-1) and DeltaS(0) of - 152 J mol(-1) K were determined. (C) 2001 Elsevier Science Ltd. All rights reserved.

引用

页码：7589 / 7594

页数：6

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