Analysis of the complexation/decomplexation phenomena in graft copolymer networks

被引：112
作者：
Lowman, AM [1 ]
Peppas, NA [1 ]
机构：
[1] PURDUE UNIV,SCH CHEM ENGN,POLYMER SCI & ENGN LABS,W LAFAYETTE,IN 47907
来源：
MACROMOLECULES | 1997年 / 30卷 / 17期
关键词：
D O I：
10.1021/ma970399k
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Graft copolymer networks of poly(methacrylic acid-g-ethylene glycol) exhibiting pH-dependent swelling behavior due to the formation of interpolymer complexes were prepared by free radical solution polymerization of methacrylic acid and poly(ethylene glycol) monomethacrylate. Dynamic swelling studies established the swelling/deswelling process due to hydrogen bonding. Additionally, the effects of copolymer composition, graft chain molecular weight, and environmental pH on network structure were studied. The average network correlation length changed significantly due to changes in environmental pH. The largest changes in network structure were observed in gels containing nearly equimolar amounts of methacrylic acid and ethylene glycol and the longest molecular weight poly(ethylene glycol) grafts. Water diffusion coefficients, determined through dynamic swelling analysis, varied by 2 orders of magnitude between the uncomplexed and complexed states.
引用
收藏
页码：4959 / 4965
页数：7
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