PVDF热致相分离法成膜体系铸膜液流变性能研究
作者:蔡新海 肖通虎 陈珊妹
单位: 宁波大学 材料科学与化学工程学院 浙江 宁波 315211
关键词: 热致相分离,聚偏氟乙烯,己内酰胺,铸膜液,流变性能
分类号: TQ028.8
出版年,卷(期):页码: 2015,35(3):7-14

摘要:
利用流变仪对聚偏氟乙烯(PVDF)/己内酰胺(CPL)热致相分离法(TIPS)成膜体系铸膜液的流变性能进行研究。考察了剪切频率、温度、PVDF质量百分含量对PVDF/CPL铸膜液体系的粘度、非牛顿性指数、粘流活化能、溶液粘弹性的影响,利用TIPS法制备PVDF膜,进一步探讨了铸膜液体系的流变性能对刮膜速率、制膜温度等成膜条件的指导作用。实验结果表明:PVDF/CPL铸膜液体系为非牛顿性流体,随着PVDF质量百分含量的升高,PVDF/CPL铸膜液体系的粘度增加,非牛顿性指数增加,粘流活化能升高,对应膜的结构越致密,水通量降低,截留率升高,膜的拉伸强度增强。PVDF质量百分含量低的铸膜液体系,制膜时对温度的灵敏度低,刮膜速率对膜的制备影响大,制膜过程需要对刮膜速率精确的控制;PVDF质量百分含量高的铸膜液体系,对温度的灵敏度高,可以在较宽的刮膜速度范围下制膜。
 
The rheology of caprolactam (CPL) solutions blends with poly (vinylidene fluoride) (PVDF) was studied by using Rheometer.The influence of different percentage PVDF content,different temperature on the PVDF/CPL casting solution system of the viscosit,the non-newtonian index,the viscous flow activation energy,modulus of solution were inspected.The PVDF microporous membranes were prepared by the method of composite thermal induced phase separation. Discuss the guiding role of the rheological  properties of casting solution system for filming conditions. The results show that PVDF/CPL casting solution system shows the characteristic of typical non-Newtonian fluid. While increasing polymer concentration, the viscosity,the non-Newtonian index and the viscous flow activation energy of polymer increased,the density of membrane and the BSA retention increased,the water flux of the membrane decreased,tensile strength of the membrane increased.The casting membrane system with low percentage PVDF content had low sensitivity to the temperature and the casting speed had a great effect on the preparation of the membrane. So the preparation of the membrane with low percentage PVDF needed precise control of the casting speed. The casting membrane system with high percentage PVDF content had high sensitivity to the temperature. The membrane with high percentage PVDF could be prepared over a wide range of casting speed at high temperature.
 

基金项目:
宁波市国际合作项目(编号:2014D10017);浙江省科技厅创新团队自主设计项目(编号:2011R50001-09);宁波大学胡岚优秀博士基金项目

作者简介:
蔡新海(1989-),男,湖北人,在读硕士,研究方向:功能高分子分离膜

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