Influence of water on the dielectric behaviour of chitosan films

被引：45

作者：

Nogales, A

Ezquerra, TA

Rueda, DR

Martinez, F

Retuert, J

机构：

[1] CSIC,INST ESTRUCTURA MAT,E-28006 MADRID,SPAIN

[2] UNIV CHILE,FAC CIENCIAS FIS & MATEMAT,DEPT QUIM,SANTIAGO,CHILE

来源：

COLLOID AND POLYMER SCIENCE | 1997年 / 275卷 / 05期

关键词：

dielectric relaxation; water sorption; natural polymers; chitosan;

D O I：

10.1007/s003960050099

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The dielectric properties of chitosan films with a degree of deacetylation of 86% have been investigated in the frequency range of 10(3)-10(6) Hz covering a broad range of temperatures from -150 to 150 degrees C. The variation of the dielectric properties with temperature has been associated with two dielectric processes: (a) a local relaxation attributed to the presence of hydrogen-bonded water appearing at low temperatures (b) a conduction process related to water molecules which becomes desorbed upon heating at T > 80 degrees C. Isothermal dielectric experiments have been performed in order to follow, in real time, the occurrence of both, the water sorption and desorption processes.

引用

页码：419 / 425

页数：7

共 18 条

[1] Dielectric relaxation and conductivity in polyelectrolyte-surfactant complexes [J].