PVA水凝胶中水的状态研究

用环氧氯丙烷作交联剂，制备了聚乙烯醇（PVA）亲水水凝胶。并用示差扫描量热法（DSC）对不同含水量的此种亲水水凝胶进行了测试，获得了各种状态水进入水凝胶聚合物网络体系的先后顺序情况，并研究了PVA水凝胶中三种状态水的含量随水凝胶含水量的变化而变化的规律。

State of Water in PVA Hydrogels

PVA hydrogel was prepared by using epichlorohydrin as crosslink reagent.The prepared water-swollen with various water retention was investigated by DSC measurement.The results indicated that the non-freezing water,the freezable bound water and the free water successively entered into the network system of the hydrogel when the PVA hydrogels absorbed water.DSC figures showed that the weight ratios of unfrozen water to dry membrane is almost a permanent(about 0.2);It also showed that the content of non-freezing water declined with the increase of H_2O retention in the hydrogel;along with the increase of freezable water(free water and freezable bound water).