THERMODYNAMIC PROPERTIES OF POLY(VINYL ALCOHOL) AND POLY(VINYL ALCOHOL VINYL-ACETATE) HYDROGELS

被引：77
|
作者：
HORKAY, F
BURCHARD, W
GEISSLER, E
HECHT, AM
机构：
[1] EOTVOS LORAND UNIV, DEPT COLLOID SCI, H-1518 BUNDAPEST, HUNGARY
[2] UNIV GRENOBLE, CNRS, SPECTROMETRIE PHYS LAB, F-38402 ST MARTIN DHERES, FRANCE
来源：
MACROMOLECULES | 1993年 / 26卷 / 06期
关键词：
D O I：
10.1021/ma00058a017
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Osmotic and light scattering observations are reported for chemically cross-linked poly(vinyl alcohol) and poly(vinyl alcohol-vinyl acetate) hydrogels and the corresponding semidilute polymer solutions. The osmotic contribution of the network polymer is obtained from swelling pressure and shear modulus measurements. The free energy of mixing in the cross-linked polymer is found to be significantly smaller than that of the polymer solution at the same concentration. Small-angle neutron scattering and static light scattering measurements indicate the presence of large-scale static structures in the systems. The fluctuating part of the total scattered intensity determined from simultaneous dynamic and static light scattering measurements is compared with the results of macroscopic osmotic observations. Reasonable agreement is found between the results of the two entirely different experiments.
引用
收藏
页码：1296 / 1303
页数：8
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