浊度法表征温敏性微凝胶体积的相转变行为

Volume Phase Transition Behavior and Stability of Temperature Sensitive Microgel by Turbidity Method

摘要: 以N-异丙基丙烯酰胺(NIPAM)、甲基丙烯酸(MAA)为单体,N,N-亚甲基双丙烯酰胺(MBA)为交联剂,制备了温敏性聚(N-异丙基丙烯酰胺)(PNIPAM)和具有温度、pH敏感性的聚(N-异丙基丙烯酰胺-co-甲基丙烯酸)(PNIPAM-MAA)微凝胶。通过测定不同温度和pH条件下微凝胶浊度变化,表征微凝胶的温度及pH敏感性,描述了NaCl浓度和pH对微凝胶体积相转变温度的影响。同时,测定了微凝胶的临界聚沉浓度及临界絮凝温度,表征了微凝胶的稳定性,讨论了影响微凝胶的稳定性因素。

Abstract: The thermo-sensitive and pH-responsive microgels were synthesized by soap-free polymerization,where N-isopropylacylamide and methacrylic acid as monomers,and N,N-methylenebisacrylamide as cross-linking agent.The thermoand pH-sensitivities of microgels wer