聚丙烯酰胺水凝胶的介电研究

A. Konsta, D. Daoukaki, A. Kyritis, P. Pissis
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引用次数: 0

摘要

采用交流介电弛豫光谱(DRS)和热激退极化电流(TSDC)在频率范围为5hz ~ 13mhz和温度范围为77 ~ 300k的条件下,研究了聚丙烯酰胺/水凝胶的介电性能随温度和含水量的变化规律。TSDC光谱显示出三个峰,前两个峰分别归因于自由水分子和松散结合水分子的重定向,而第三个峰是水凝胶成分玻璃化转变的表现。随着温度的降低,DRS光谱呈现出逐渐向低频偏移的介电色散特征,表明在T<0 /spl℃时水的结晶以及冻融过程的不可逆性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Dielectric studies of polyacrylamide hydrogels
The dielectric properties of polyacrylamide/water hydrogels, as a function of water content and temperature, are investigated using ac dielectric relaxation spectroscopy (DRS) in the frequency range 5 Hz-13 MHz and thermally stimulated depolarization currents (TSDC) in the temperature range 77-300 K. TSDC spectra reveal three peaks, the first two being attributed to the reorientation of free and loosely bound water molecules respectively, whereas the third one is a manifestation of the glass transition in the hydrogel constituents. DRS spectra display a dielectric dispersion which shifts gradually to lower frequencies with decreasing T. The water crystallization at T<0 /spl deg/C, as well as the non-reversibility of the freezing-thawing process, are clearly demonstrated from the evolution of ac conductivity spectra with temperature.
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