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OALib Journal期刊
ISSN: 2333-9721
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聚丙烯酸类水凝胶的制备及其在碱性溶液中的ph敏感性
Keywords: 高分子材料,水凝胶,ph敏感性,丙烯酸,丙烯酰胺,溶胀
Abstract:
？以(nh4)2s2o8和nahso3为氧化--还原引发剂、n,n'--亚甲基双丙烯酰胺(mba)为交联剂,采用自由基水溶液聚合方法,分别合成了聚丙烯酸(paac)、聚丙烯酰胺(paam)和系列丙烯酸(aac)质量分数(faac)不同的聚(丙烯酸--co--丙烯酰胺)(p(aac--co--aam))水凝胶。进而分别对其在碱性缓冲溶液和naoh溶液中的ph敏感行为进行了探讨。结果表明,paac和p(aac--co--aam)凝胶在2种溶液中均具有优良的ph响应行为,且在naoh溶液中的溶胀比大于缓冲溶液中;而paam凝胶仅在naoh溶液中具有ph敏感性。2种溶液中,随faac的增加,p(aac--co--aam)凝胶的平衡溶胀比(esr)增大;但在缓冲溶液中,当faac≧20%时,p(aac--co--aam)凝胶的溶胀行为与paac相似,而当faac<20%时,其溶胀则同时表现出paac和paam凝胶的溶胀特性。溶胀机理分析表明,凝胶的溶胀主要受聚合物网络内静电排斥作用和离子屏蔽效应控制。
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