Reaction of poly(vinyl alcohol) and dialdehydes during gel formation probed by H-1 nmr - A kinetic study

被引：28

作者：

Hansen, EW ^{[1
]}

Holm, KH ^{[1
]}

Jahr, DM ^{[1
]}

Olafsen, K ^{[1
]}

Stori, A ^{[1
]}

机构：

[1] SINTEF,MAT TECHNOL,N-0314 OSLO,NORWAY

来源：

POLYMER | 1997年 / 38卷 / 19期

关键词：

poly(vinyl alcohol); 2,5-dimethoxy-2,5-dihydrofuran; glutaraldehyde;

D O I：

10.1016/S0032-3861(97)00002-5

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Proton n.m.r. has been used to study the reaction between poly(vinyl alcohol) (PVA) and two different dialdehyde crosslinkers during gel formation (gels for improved oil recovery applications). The rate of formation of covalent bonds between PVA and glutaraldehyde in acidic saline water solutions was found to be of first order with respect to both the Hf concentration and the formal dialdehyde concentration. The activation energy was found to increase with increasing dialdehyde concentration and increasing pH (3.2-4.7). The corresponding reaction rate of formation of covalent bonds between PVA and butenedial in the PVA/2,5-dimethoxy-2,5-dihydrofuran system at the same pH and temperature was found to be an order of magnitude less. Also, the activation energy was higher by approximately 50% as compared with the PVA/glutaraldehyde system. Possible reaction pathways for the generation of PVA-dialdehyde gels are discussed. (C) 1997 Elsevier Science Ltd.

引用

页码：4863 / 4871

页数：9

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