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.
Objective: The theta temperature of polyglycolic acid in different solvents was determined. Methods: The cloud point temperature of polyglycolic acid in N-methyl pyrrolidone, benzyl alcohol, aniline and m-cresol solutions was measured at various concentrations. The theta temperature was determined via the linearity of the reciprocal of cloud point temperature against the logarithm of the polymer volume fraction. Results: The theta temperature of polyglycolic acid in N-methyl pyrrolidone, benzyl alcohol, aniline and m-cresol solutions was 429.92, 430.85, 437.45 and 449.03 K, respectively. Conclusion: The results showed that the theta temperature increased with the increase of interaction parameter between polyglycolic acid and solvents. The higher the interaction parameter, the larger the free energy of mixing and the chemical potential change of the solvent, the weaker the spontaneous dissolution, and the higher the theta temperature.
作者
唐四叶
曹欣祥
刘丰
尹卫东
TANG Siye;CAO Xinxiang;LIU Feng;YIN Weidong(College of Chemistry and Chemical Engineering∥Henan Key Laboratory ofFunction-Oriented Porous Materials, Luoyang Normal College, Luoyang 471934, China)
出处
《暨南大学学报（自然科学与医学版）》
CAS
CSCD
北大核心
2018年第6期542-546,共5页
Journal of Jinan University(Natural Science & Medicine Edition)
基金
国家自然科学基金项目(21476102)
河南省高校重点项目(16A150055)
关键词
聚乙醇酸
θ温度
混合自由能
相互作用参数
polyglycolic acid
theta temperature
free energy of mixing
interaction parameter
