热致相分离法制备聚丙烯-聚氯乙烯共混疏水微孔膜及其膜蒸馏性能  

Preparation of polypropylene/polyvinyl chloride co-blending hydrophobic microporous vacuum distillation membrane viathermally induced phase separation

作　　者：韩怀远[1,2] 张蕾[1,2] 冯春磊[1,2] 项军[1,2] 程鹏高[1,2] 唐娜[1,2] 

机构地区：[1]天津科技大学化工与材料学院,天津300457 [2]天津市海洋资源与化学重点实验室,天津300457

出　　处：《膜科学与技术》2016年第2期48-54,共7页Membrane Science and Technology

基　　金：国家自然基金(21376178);天津市科委科技支撑重大专项(12ZCDZSF06900-3);天津市科委面上重点项目(12JCZDJC30000);天津市海洋经济创新发展区域示范项目(cxsf2014-26);教育部创新团队项目([2013]373);天津市创新团队项目(TD12-5004);天津科技大学大学生创新创业训练计划(201410057075)

摘　　要：采用热致相分离法制备等规聚丙烯(iPP)-聚氯乙烯(PVC)共混疏水微孔平板膜,分别研究了iPP/PVC质量比和固含量对共混膜结构的影响,检测了iPP/PVC共混疏水微孔平板膜的平均孔径、孔隙率、孔径分布以及接触角等特性参数.结果表明:iPP/PVC共混疏水微孔膜断面呈现片状和树枝状复合"sandwich-structure"膜孔结构.随着共混聚合物体系中iPP含量的增加,iPP/PVC共混疏水微孔膜平均孔径逐渐增大,孔隙率也逐渐增大.最后,将制得的iPP/PVC共混疏水微孔膜应用于0.5mol/L NaCl水溶液真空膜蒸馏过程,在真空度为0.095MPa、进料流量为30L/h、料液温度为85℃时,iPP/PVC共混疏水微孔膜VMD通量最高达到13.11kg/(m2·h),截留率高于99.9%.Isotatic polypropylene（iPP）/polyvinyl chloride（PVC）co-blending hydrophobic microporous flatsheet membranes were prepared viathermally induced phase separation（TIPS）.The morphology of iPP/PVC co-blending hydrophobic membranes was discussed with different iPP/PVC mass ratio and different polymer concentration.Meanwhile,some of the properties of the iPP/PVC co-blending hydrophobic membranes were measured,such as mean pore diameter,porosity,and contact angle.The results showed that the morphology of iPP/PVC co-blending hydrophobic membranes was sandwich-structure comprised of plate-like and branch-like structure.The mean pore diameter and porosity of the co-blending membranes were increased with the addition of iPP mass ratio. At last,the vacuum membrane distillation performances of the iPP/PVC co-blending hydrophobic membranes were investigated using 0.5 mol/L NaCl solution as feed solution.Under the conditions of 0.095 MPa vacuum degree and 30L/h feed flow,the permeate flux of the co-blending membranes reached 13.11kg/（m^2·h）with〉99.99% NaCl rejection at a 85 ℃ of feed temperature.

关 键 词：热致相分离 等规聚丙烯 聚乙烯 共混膜 膜蒸馏 

分 类 号：TQ051.893[化学工程]