Preparation of poly(α-hydroxyacrylic acid) gel by γ-irradiation and its swelling behaviour

被引：8
|
作者：
Tamura, T [1 ]
Kawauchi, S [1 ]
Satoh, M [1 ]
Komiyama, J [1 ]
机构：
[1] Tokyo Inst Technol, Dept Polymer Sci, Meguro Ku, Tokyo 152, Japan
来源：
POLYMER | 1998年 / 39卷 / 8-9期
关键词：
poly(alpha-hydroxyacrylic acid); gamma-irradiation; gelation;
D O I：
10.1016/S0032-3861(97)00464-3
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Gels of poly(alpha-hydroxyacrylic acid) (PHA) and poly(acrylic acid) (PAA) were prepared by gamma irradiation of 15 wt% aqueous solutions. Gelation of the two polymers occurred only in the lower pH range (1-4). Ab initio energy calculations for radical formation on the PHA main chain suggested that the hydrogen atom of the hydroxyl group is easily attacked by hydroxyl radicals when a lactone ring is formed between adjacent OH and COOH groups. The swelling ratios (SR) of PHA and PAA gels were measured in water as a function of state of dissociation of the COOH group. For PHA gel, SR gradually increased above pH 1 and steeply above pH 6. The steep increase for PHA is ascribed to lactone ring-opening in the gel, as suggested by i.r. peak displacement. (C) 1997 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：1555 / 1558
页数：4
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