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- 2018
聚乙醇酸在不同溶剂中的θ温度
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Abstract:
摘要 目的:测定聚乙醇酸在不同溶剂中的θ温度. 方法:测定不同浓度的聚乙醇酸-N-甲基吡咯烷酮、聚乙醇酸-苯甲醇、聚乙醇酸-苯胺和聚乙醇酸-间甲酚溶液的浊点温度,依据浊点温度的倒数与聚乙醇酸体积分数的对数之间的线性关系得到聚乙醇酸在不同溶剂中的θ温度.结果:聚乙醇酸在N-甲基吡咯烷酮、苯甲醇、苯胺和间甲酚的θ温度分别为429.92、430.85、437.45、449.03 K.结论:θ温度随聚乙醇酸与溶剂之间的相互作用参数的升高而升高. 相互作用参数越大,混合自由能和化学势变化越大,自发溶解的趋势越弱,θ温度越高.
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