论文部分内容阅读
采用熔纺-拉伸法制备了一系列聚丙烯中空纤维膜。研究了牵引速率对中空纤维及微孔膜的结晶性、弹性回复率、表观形貌等性能的影响。结果表明:牵引速率对聚丙烯中空纤维的结晶行为有较大影响,牵引速率越大,越有利于shish-kebab晶体的形成与均匀分布,从而改善纤维的硬弹性;随着牵引速率的提高,中空纤维膜的表面结构发生相应变化,同时其孔隙率和水通量均增大,内外径及拉伸强度均减小;当牵引速率为350和420 m/min时,制得的中空纤维微孔膜结构与性能较好。
A series of polypropylene hollow fiber membranes were prepared by melt spinning-drawing method. The influence of traction rate on the properties of hollow fiber and microporous membrane such as crystallinity, elastic recovery rate and apparent morphology was studied. The results show that the traction rate has a significant effect on the crystallization behavior of polypropylene hollow fiber. The larger the traction rate, the more favorable the formation and uniform distribution of shish-kebab crystals, so as to improve the hard elasticity of the fiber. With the increase of traction rate, The surface structure of the hollow fiber membranes changed accordingly. Meanwhile, the porosity and water flux of the hollow fiber membranes increased, while the inner and outer diameters and the tensile strength of the hollow fiber membranes decreased. When the pulling rates were 350 and 420 m / min, Porous membrane structure and performance is better.