A study on dynamics of water in crosslinked poly(N-isopropylacrylamide) gel by nmr spectroscopy

被引：67

作者：

Tanaka, N ^{[1
]}

Matsukawa, S ^{[1
]}

Kurosu, H ^{[1
]}

Ando, I ^{[1
]}

机构：

[1] Tokyo Inst Technol, Dept Polymer Chem, Tokyo 152, Japan

来源：

POLYMER | 1998年 / 39卷 / 20期

关键词：

crosslinked poly(N-isopropylacrylamide) gel; nmr spectroscopy;

D O I：

10.1016/S0032-3861(97)10210-5

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

dynamics of crosslinked poly (N-isopropylacrylamide) gel have been studied by means of pulsed-gradient spin-echo (PGSE) H-1 nuclear magnetic resonance (n.m.r.), pulse H-1 n.m.r. and H-1 n.m.r. imaging. The selfdiffusion coefficients of HDO (D-HDO) in D2O (containing a small amount of HDO) in the gels with various degree of swellings were determined by the PGSE H-1 n.m.r. method. From these experimental results, it was found that the D-HDO is decreased as the degree of swelling is decreased, and D-HDO in the gels with a constant degree of swelling in going from 20 to 45 degrees C is transitionally decreased at about 32 degrees C, which corresponds to the phase transition temperature. From the detailed analysis of proton spin-spin relaxation time T-2 determined by the pulse H-1 n.m.r. method, the process of the volume phase transition of the gel has been elucidated. Furthermore, spatial information about the molecular motion of water in the gel sample was obtained by T-2 enhanced H-1 n.m.r. imaging. (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：4703 / 4706

页数：4

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