Tsai F J, Torkelson J M
Department of Chemical Engineering, Northwestern University, Evanston, IL 60208.
Prog Clin Biol Res. 1989;292:119-28.
Both polydisperse and monodisperse PMMA/xylene phase diagrams have been determined successfully by applying the optical density method. The changes in optical density for the polydisperse PMMA system are not as dramatic as the changes for the monodisperse PMMA system. Through the thermal-inversion process, the asymmetric membranes can be successfully made for this PMMA/xylene system. In the later stages of phase separation by spinodal decomposition, the flow properties of the PMMA/xylene system play a vital role in determining the final membrane microstructure. During the very early stage of phase separation by spinodal decomposition, a membrane with lacy structure results. In contrast, during the later stage of phase separation, a membrane structure with small pores dispersed in the polymer matrix results.
通过应用光密度法已成功测定了多分散和单分散聚甲基丙烯酸甲酯/二甲苯相图。多分散聚甲基丙烯酸甲酯体系的光密度变化不如单分散聚甲基丙烯酸甲酯体系的变化显著。通过热反转过程，可以成功地为该聚甲基丙烯酸甲酯/二甲苯体系制备不对称膜。在旋节线分解相分离的后期阶段，聚甲基丙烯酸甲酯/二甲苯体系的流动特性在决定最终膜微观结构方面起着至关重要的作用。在旋节线分解相分离的非常早期阶段，会形成具有花边结构的膜。相反，在相分离的后期阶段，会形成在聚合物基体中分散有小孔的膜结构。
