聚合物PPES/PPEK/PPESK-NMP-H_2O三元体系的相行为研究 (Ⅱ)相图的计算  

Study on the phase separation for novel polymer PPES/PPEK/PPESK-NMP-H2O systems (Ⅱ) Calculation of the phase diagram

作　　者：林阳政[1] 薛亚卓[1] 李继定[1] 陈翠仙[1] 

机构地区：[1]清华大学化学工程系,北京100084

出　　处：《膜科学与技术》2008年第3期33-38,44,共7页Membrane Science and Technology

基　　金：国家973项目(2003CB615701);国家自然科学基金项目(20576059;20676067);中石化科技开发研究基金(X505002);中石油风险创新基金

摘　　要：以Flory-Huggins理论为基础,详细推导了聚合物-溶剂-非溶剂三元聚合物成膜体系的双节线、旋节线和临界点求解方程,提供了方程的求解方法.根据此理论和方法,分别求解了聚合物杂萘联苯聚芳醚砜酮、杂萘联苯聚芳醚砜和杂萘联苯聚芳醚酮与H2O及NMP组成的三元体系在25℃时的相分离曲线.将计算结果与实验测定的浊点数据进行比较,分别优化校正了溶剂NMP与聚合物PPES、PPEK和PPESK之间的相互作用参数g23.提出二元Flory-Huggins相互作用参数值随温度变化的一般关系.并据此关系,以25℃时的相互作用参数为基准求解PPES/PPEK/PPESK-NMP-H2O三元体系在50℃和75℃时的相图,计算结果与浊点实验数据相吻合.Based on the Flory- Huggins theory, the binodal, spinodal and critical point equations for polymersolvent - nonsolvent system are derived in detail. Some simple solving methods to the equations are given. According to these equations and methods, the phase separation curves of PPESK, PPES and PPEK - NMP - H2O ternary systems at 25℃ are obtained respectively. Comparing the calculated binodal with the experimental cloud point, the binary interaction parameter between solvent NMP and polymer PPES, PPEK or PPESK are adjusted. A general relation between the binary Flory - Huggins interaction parameters with temperature is proposed. Using this relation, based on the interaction parameters at 25 ℃, the phase diagram of PPES/PPEK/PPESK - NMP - H2O at 50 and 75℃ are obtained, the calculated binordal curves are fit well with the experimental cloud point.

关 键 词：Flory—Huggins理论 双节线 相互作用参数 温度 相图 

分 类 号：O631.3[理学—高分子化学]