POPCORN-POLYMER FORMATION DURING HYDROGEL SYNTHESIS

被引：2

作者：

BAKER, JP

BLANCH, HW

PRAUSNITZ, JM

机构：

[1] LAWRENCE BERKELEY LAB, DIV CHEM SCI, BERKELEY, CA 94720 USA

[2] UNIV CALIF BERKELEY, DEPT CHEM ENGN, BERKELEY, CA 94720 USA

来源：

POLYMER GELS AND NETWORKS | 1995年 / 3卷 / 01期

基金：

美国国家卫生研究院;

关键词：

D O I：

10.1016/0966-7822(94)00007-T

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Popcorn polymers were found within the matrices of two different hydrogels: (I) a hydrogel formed in water by copolymerizing acrylamide with the cationic monomer [(methacrylamido)propyl]trimethyl-ammonium chloride (MAPTAC) and the divinyl monomer N,N'-methylenebisacrylamide (BIS); and (II) a hydrogel formed in a 60/40 (nu/nu) mixture of ethylene glycol/water by copolymerizing 2-hydroxyethyl methacrylate (HEMA) with the basic monomer 2-dimethylaminoethyl methacrylate (DMA) and the divinyl monomer ethylene glycol dimethacrylate (EGDMA). For I, popcorn-polymer formation within the gel matrix could be suppressed during synthesis by raising the initiator concentration, adding a chain-transfer agent, or by changing the mode whereby radicals are generated in the reaction mixture. For II, popcorn-polymer formation could be suppressed by raising the initiator concentrations, or by switching to an alternative diluent-initiator system. A proposed mechanism for popcorn-polymer formation in hydrogels is consistent with experimental observations. The results obtained here may be useful to others who want to avoid popcorn-polymer formation.

引用

页码：47 / 58

页数：12

共 23 条

[1] EQUILIBRIUM SWELLING PROPERTIES OF WEAKLY IONIZABLE 2-HYDROXYETHYL METHACRYLATE (HEMA)-BASED HYDROGELS [J].