摘要
用环氧氯丙烷作交联剂，制备了聚乙烯醇亲水凝胶，并用ＤＳＣ对此种亲水凝胶中水的状态进行了研究。结果表明，这水凝胶中的水大致可分为：７１％的自由水，２５％的束缚水和４％的非冷冻水。在９０℃下，对这种水凝胶干燥处理后，由于ＰＶＡ链段发生结晶，水凝胶的吸水倍数由２６下降至１２．４，但凝胶中３种水的相对比例几乎不变。
Poly (vinyl alcohol) hydrogel was prepared by using epichlorohydrin as crosslinking agent.The swelling behaviour and the state of water in the PVA hydrogel were examined. It is found that the degree of swelling decreases from 26 to 18,15,12 and 9 after annealing at 30 ℃, 60 ℃, 90℃ and 120 ℃,respectively.The partial crystalization of the PVA segment in the hydrogel is the essential reason for the decrease of the degree of swelling. Differential scanning calorimetry studies showed that the waters in the non annealed gel can be classified as,71% of free.25%% of bound and 4% of nonfreezing water.These valuse are almost unchanged after annealing.The amount of non-freezing water coresponding to one mole hydroxyl group of PVA is 2.6 mols for the non-annealed gel,and 1.5 mols for the gel annealed at 90℃.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
1994年第1期130-132,共3页
Polymer Materials Science & Engineering
基金
成都科技大学青年基金
关键词
水凝胶
环氧氯丙烷
聚乙烯醇
交联
s:hydrogel,epichorohydrin PVA,DSC,state of water.
