MICROPOROUS MEMBRANE FORMATION VIA THERMALLY-INDUCED PHASE-SEPARATION .3. EFFECT OF THERMODYNAMIC INTERACTIONS ON THE STRUCTURE OF ISOTACTIC POLYPROPYLENE MEMBRANES

被引:255
作者
KIM, SS
LLOYD, DR
机构
[1] Department of Chemical Engineering, Separations Research Program, Center for Polymer Research, Austin
关键词
MEMBRANE PREPARATION AND STRUCTURE; MICROPOROUS MEMBRANES; PHASE SEPARATION; THERMALLY-INDUCED; ISOTACTIC POLYPROPYLENE MEMBRANES;
D O I
10.1016/0376-7388(91)80074-G
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Isotactic polypropylene membranes were prepared via thermally-induced phase separation using three isotactic polypropylene-diluent systems, at three concentrations, and two thermal histories. The three diluents had similar structure and molar volume, but differed in end-group structure and therefore differed in interactions with the isotactic polypropylene (iPP). The two thermal histories represented isothermal and non-isothermal thermally-induced phase separation processes. Membrane structure as determined by scanning electron microscopy depended on the phase separation mechanism (liquid-liquid versus solid-liquid), which depended on the concentration-dependent isotactic polypropylene-diluent interactions and the thermal history.
引用
收藏
页码:13 / 29
页数:17
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