PVA水凝胶的弹性和溶胀特性研究  

Study on Elasticity and Swelling Behavior of PVA Hydrogel

作　　者：李蕾[1] 雷光伦[1] 姚传进[1] 高雪梅[1] 犹佳雨 

机构地区：[1]中国石油大学(华东)石油工程学院,青岛266580

出　　处：《高分子通报》2013年第6期39-43,共5页Polymer Bulletin

基　　金：中国石油大学(华东)研究生创新基金资助项目(CX-1208)

摘　　要：采用硼酸与聚乙烯醇化学交联方法制备了聚乙烯醇(PVA)水凝胶,通过对PVA水凝胶的弹性与溶胀性能的研究,优选出交联剂硼酸与聚乙烯醇的最佳配比量;探究温度对PVA水凝胶弹性的影响以及时间、矿化度、温度对PVA水凝胶溶胀特性的影响。结果表明,随硼酸用量的增加,PVA水凝胶的溶胀率与弹性模量值都表现出先增大后减小的特征,当硼酸:PVA=10%时,PVA水凝胶的弹性和溶胀特性均最佳;PVA水凝胶在水溶液中溶胀率随时间的增长逐渐增大,40h后基本达到溶胀平衡;随矿化度的增大而减少,耐矿化度强,在10%盐度水中还能膨胀1倍,适用于高矿化度油藏;耐温性强,随温度的增大变化不大,适用于油藏温度。Polyvinyl alcohol （PVA） hydrogel was prepared by means of chemical crosslinking with boric acid as the crosslinker. The optimum ratio of crosslinker to PVA was sought based on the studies of elasticity and swelling behavior of PVA hydrogel. The influence of temperature on the elasticity and the influence of swelling time, salt concentration, and temperature on the sweil.ing ra6.o were tested. The resultsw that with the increase of crosslinker, the swelling ratio and elastic modulus value of PVA hydrogel gradually increased, and when reached maximum, then decreased with the increase of crosslinker. When the ratio of crosslinker to PVA equals 10%, the elasticity and swelling property of PVA hydrogel are the best. The swelling ratio of PVA hydrogel gradually increases with the swelling time increase, and reaches swelling equilibrium in aqueous solution within 40h. The swelling ratio of PVA hydrogel reduces with the increase of salinity in aqueous solution; however, its resistance to salinity is quite strong. It can swell twice its size in water of 10% salinity, so it is applicable to high salinity reservoirs. The swelling ratio and elasticity of PVA hydrogel are not sensitive to temperature; there is hardly any change with the increase of temperature. Consequently, PVA hydrogel is applicable in reservoir temperature.

关 键 词：聚乙烯醇水凝胶 硼酸 溶胀性 弹性 

分 类 号：R318.08[医药卫生—生物医学工程]