以PEI与PSf为对象,研究了双层刮膜过程中两种高分子分层的原因,考察了PSf膜表面开孔结构的形成原理.考察了两层制膜液间的凝胶值之差、膜的收缩率以及添加剂PVPK-90等热力学和动力学参数对分层/粘结性的影响.研究发现,凝胶值作为一个热力学参数不能单独作为高分子分层/粘结的标准;同时发现,通过提高凝胶浴温度减少PEl膜与PSf膜之间的收缩率差别可以促进粘结,研究还发现,PVPK-90起到了促进膜层间粘结性的作用.采用含不同量溶剂的凝胶浴,证明了双层刮膜过程中PSf膜的表面开孔结构是由于PEI膜为支撑层提供了一个近似富含溶剂的凝胶浴得到的.
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