膜科学与技术

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研究

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

单位： 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

关键词：热致相分离；等规聚丙烯；聚乙烯；共混膜；膜蒸馏

出版年,卷(期):页码： 2016,36(2):48-54

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。研究结果表明：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0.5 mol•L-1NaCl水溶液真空膜蒸馏过程，在真空度为0.095 MPa、进料流量为30 L•h-1，料液温度为85°C时，iPP/PVC共混疏水微孔膜VMD通量最高达到13.11 kg•m-2•h-1，截留率高于99.9%。

Isotatic polypropylene/polyvinyl chloride co-blending hydrophobic microporous flat-sheet membranes were prepared via TIPS. The morphology of iPP/PVC co-blending hydrophobic membranes were 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 result showed that the morphology of iPP/PVC co-blending hydrophobic membranes was sandwich-structure comprised of plate-like structure and branch-like structure. The mean pore diameter and porosity of co-blending membranes was 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-1 NaCl solution as feed solution. Under the condition of 0.095MPa vacuum degree and 30 L•h-1 feed flow, the permeate flux of the co-blending membranes reached 13.11 kg•m-2•h-1 with >99.99% NaCl rejection at 85 °C feed temperature.

第一作者简介：韩怀远（1986-），男，河南郑州人，博士生。主要研究方向：热致相分离制膜及膜分离技术。（alexhanhuaiyuan@163.com）通讯作者：E-mail:（tjtangna@tust.edu.cn）

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