热致相法制备聚丙烯—聚乳酸共混中空纤维膜及其性能测试  

Polypropylene-poly(lactic acid)hollow fiber membrane by thermally induced phase separation and its performance test

作　　者：徐志红[1,2] 黄鑫[3] 王伟平[3] 郭强 李磊[3] 张志炳[3] 

机构地区：[1]南京大学环境学院,南京210023 [2]江苏华益科技有限公司,常熟215522 [3]南京大学化学化工学院,南京210023

出　　处：《南京大学学报（自然科学版）》2016年第2期229-234,共6页Journal of Nanjing University（Natural Science）

基　　金：江苏省自然科学基金面上项目(BK2012727)

摘　　要：采用热致相分离法制备了等规聚丙烯（iPP）-聚乳酸（PLA）共混中空纤维膜,并在碱性条件下水解膜表面的聚乳酸而产生亲水性基团,从而提高共混膜的表面亲水性.讨论了热致相法制膜中稀释剂配比对于共混膜的力学性能以及气体渗透性能的影响,表征了水解前后膜的接触角变化.电镜结果表明,聚乳酸颗粒呈10~20μm多孔状球状粒子均匀分散于共混膜的内部和表面,两种高分子组分表现为部分相容.此外力学性能结果发现共混膜的断裂伸长率高于iPP膜,而气体渗透性能结果证明稀释剂配比为5∶5时通量最佳.最后接触角测试表明,共混膜水解后亲水性获得大幅度提高.The purpose of this work is to fabricate porous isotactic polyproylene（iPP）membrane with uniformly dispersed poly lactic acid（PLA）porous particles inside.In order to extend its application in biomedical field,surface hydrophilic modification was carried out.In this study,iPP-PLA blend hollow fiber membranes were prepared via thermally induced phase separation（TIPS）method and PLA surface ester group hydrolysis under alkali solution was applied to improve its hydrophilicity.The effect of different diluent mixture ratio on the mechanical properties was measured and compared by tensile strength tests.For further evaluation of potential biomedical application in blood gas separation like membrane oxygenator,O2 and CO2gas permeation properties of the iPP-PLA membrane was in-vestigated,and optimized fabrication parameter was then selected.Water contact angle was measured to indicate hydrophobic to hydrophilic change after surface alkali hydrolysis.The SEM was used to characterize the morphology of the membrane and the results showed that in iPP-PLA blend system,with MAH-g-PP as surfactant agent,partially miscible was observed and porous PLA particles,also formed via TIPS,dispersed in iPP matrix uniformly with 10-20μm in size.Mechanical property measurements showed that iPP-PLA membrane demonstrates larger elongation at break than iPP membrane and biggest gas permeation rate was achieved with 5：5diluent ratio.After hydrolysis,smaller water contact angle of iPP-PLA hollow fiber membrane surface indicates significantly hydrophilic improvement.

关 键 词：聚丙烯—聚乳酸 中空纤维膜 热致相法 表面水解 

分 类 号：TQ028.8[化学工程]