在相同制膜条件下,采用扩散致相转化法制备了芳香/脂肪族共聚脲多孔膜.通过对孔隙率、力学性能的测试及扫描电镜的微观分析,讨论了凝胶浴体系中溶剂的体积百分数及同类制膜大分子的不同链段结构对膜微观结构和机械性能的影响.实验结果表明:随着凝固浴中溶剂体积百分含量的增加,多孔膜表面的微孔直径逐渐增大;而相应截面的指状孔有缩小的趋势,直到最终消失而形成完全海绵状孔的截面形态;制膜大分子本身的结构对膜形态结构及性能有重大影响:三种共聚脲多孔膜都具有非对称结构,不同结构的共聚脲制备出的多孔膜各自的表面、截面形态都不相同;多孔膜的机械性能也都各不相同,其中芳香族共聚脲多孔膜具有最好的机械性能.
At a uniform condition of forming membranes and a fixed weight polymer concentration, the flat porous membranes were prepared from the solutions by diffusion- induced phase inversion.The analysis of porosities, mechanical property and morphologies were investigated preliminarily.The effect of the volume con-tent of the solvent DMAc in coagulation baths and different structure of the segments of the similar co- polyurea macromolecule on morphological structure and the mechanical properties of the membranes were also discussed.The research results showed that the diameters of micro- pores increased gradually when the volume content of the solvent DMAc in coagulation baths changes from 40 % to 60 %.Accordingly, the finger- like macrovoids of the cross sections of these membranes structure trend to be reduced and disappear gradually, finally, to be re-placed by sponge- like voids.The structure of macromolecule has a great impact on morphological structure and the mechanical properties of the membranes.Three kinds of porous membranes take on asymmetrical structure.The porous membranes prepared by the different co- polyurea macromolecule have different morphological structure of top surfaces and cross-sections.Three kinds of co- polyurea porous membranes have different me-chanical properties and the aromatic co- polyurea membranes have the best mechanical properties.
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