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Rheological behavior of poly(vinylidene fluoride) thermal induced Phase separation into casting membrane liquid system
Authors：  CAI Xin-hai，XIAO Tong-hu*，CHEN Shan-mei
Units： Faculty of Materials Science and Chemical Engineering，Ningbo University，Ningbo 315211，China
KeyWords： Thermally induced phase separation, Poly (vinylidene fluoride),Caprolactam ,Casting solution system , Rheology property
ClassificationCode：TQ028.8
year,volume(issue):pagination： 2015, 35(3):7-14

Abstract：

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.
 

Funds：
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

AuthorIntro：
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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