关键词: 压力响应行为, 聚氨酯, 中空纤维膜, 后处理, 熔融纺丝

Abstract: Modified polyurethane（PU)based hollow fiber membranes were prepared by the melt-spinning method.Influences of drawing, heat-treatment temperature and heat-treatment time on the pressure-responsive behavior were studied by the relationships between water flux and test pressure.The results showed that the hollow fiber membranes exhibited obvious pressure-responsive behavior.With increasing theoretical draw ratio,the strength of the membrane was greater and the pressure-responsive behavior was stronger.While, membrane pore size on inner surface and mean pore size became larger, the pure water flux（PWF)increased, the porosity first increased then slightly decreased.With increasing heat-treatment temperature, membrane support became worse and the pressure-responsive behavior became weaker.While, membrane pore size became smaller, the PWF and porosity of membrane increased and then decreased.With extending heat-treatment times, the deformation-recovery ratio of membrane diminished and the pressure-responsive behavior became weaker.The PWF and porosity of membrane first increased, then decreased, finally achieved stability.

Key words: pressure-responsive behavior, polyurethane, hollow fiber membrane, post-treatment, melt-spinning