冷拉伸对聚丙烯中空纤维膜结构与性能的影响  

Effect of Cold Stretching on the Structure and Performance of Polypropylene Hollow Fiber Membrane

作　　者：高进 祁沛熙 鲍青倩 田鑫 韦俊宇 李杨[1] 罗大军 GAO Jin;QI Pei-xi;BAO Qing-qian;TIAN Xin;WEI Jun-yu;LI Yang;LUO Da-jun(School of Materials and Energy Engineering,Guizhou Institute of Technology,Guiyang 550003,China;National Engineering Research Center for Compounding and Modification of Polymeric Materials,Guiyang 550014,China)

机构地区：[1]贵州理工学院材料与能源工程学院,贵州贵阳550003 [2]国家复合改性聚合物材料工程技术研究中心,贵州贵阳550014

出　　处：《塑料科技》2021年第4期1-5,共5页Plastics Science and Technology

基　　金：国家级大学生创新创业训练计划项目(202014440035);贵州省省级大学生创新创业训练计划项目(S202014440072)。

摘　　要：采用热致相分离法(TIPS)结合冷拉伸制备不同拉伸比例的聚丙烯中空纤维膜(PPHFM),结合拉伸模型与力学性能测试分析拉伸比例对PPHFM宏观结构与力学性能的影响;采用SEM、孔隙率测试等表征不同拉伸比例PPHFM的微观结构;测试PPHFM的纯水通量和抗污染性能,考察拉伸比例对膜性能的影响。结果表明:随着拉伸比例的增大,PPHFM内外径减小,拉伸强度增大,最高提高200%。同时,内外皮层破裂形成大量微孔使膜孔隙率增加,对应膜的纯水通量大幅增加,最高达136.9 L/(m^(2)·h)。此外,PPHFM外皮层结构撕裂形成的微孔有利于牛血清白蛋白(BSA)的附着,导致膜抗污染性能降低。Polypropylene hollow fiber membrane(PPHFM)with different stretching ratios were prepared by thermally induced phase separation(TIPS)combined with cold stretching.The mechanical properties of PPHFM were tested by combining the stretching model to analyze the influence of stretching ratios on the macroscopic structure and mechanical properties of PPHFM.SEM and porosity test were used to characterize the microstructure of PPHFM with different stretching ratios.The pure water flux and antipollution property of PPHFM were measured to investigate the influence of stretching ratios on membrane performance.The results show that with the stretching ratio increases,the inner and outer diameters of PPHFM decrease,and the tensile strength increases,with a maximum increase of 200%.Meanwhile,a large number of micropores formed by the rupture of the inner and outer cortex,which increase the porosity of the membrane,and the pure water flux of the corresponding membrane also increases significantly,up to 136.9 L/(m^(2)·h).In addition,the micropores formed by tearing the outer cortical structure of PPHFM are conductive to the adhesion of bovine serum albumin(BSA),leading to the reduction of membrane antifouling performance.

关 键 词：聚丙烯中空纤维膜 热致相分离法 膜结构 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]