EVIDENCE FOR MOLECULAR CR-3+ CROSS-LINKS IN CR-3+/POLYACRYLAMIDE GELS

被引：33

作者：

BURRAFATO, G ^{[1
]}

CARMINATI, S ^{[1
]}

BONACCORSI, F ^{[1
]}

LOCKHART, TP ^{[1
]}

机构：

[1] ENIRICERCHE SPA,VIA MARITANO 26,I-20097 SAN DONATO MILANE,ITALY

来源：

MACROMOLECULES | 1990年 / 23卷 / 08期

关键词：

D O I：

10.1021/ma00210a044

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The gelation of buffered aqueous solutions of Cr3+ and Polyacrylamide having a low degree of hydrolysis (0.7% and 10%) has been investigated over a wide range of pH. It has been found that gelation occurs between pH 2.3 and 6.7 and that the time of gelation increases dramatically at low pH. An inverse correlation between Cr(OH)3(H2O)3 colloid formation (revealed by solution turbidity) and the pH range of gelation indicates that discrete, soluble (monomeric or oligomeric) rather than colloidal forms of Cr3+ are responsible for the cross-linking. The occurrence of gelation in the pH interval 6.0-6.7, where only a small amount of the Cr3+ would be soluble in a simple aqueous solution, has been attributed tentatively to Cr3+ complexation by the polymer. Cr3+ solubility experiments at pH 6.6 in solutions containing model, monomeric carboxylate compounds lend support for this hypothesis. © 1990, American Chemical Society. All rights reserved.

引用

页码：2402 / 2406

页数：5

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