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Gelation kinetics of a Copoly(phthalazinone biphenyl ether sulfone) membrane via immersion precipitation

Authors： WANG Xu, ZHANG Shouhai, ZHANG Yingnan, XU Peiqi, LIU Qian, JIAN Xigao

Units： College of chemical engineering, Dalian University of Technology, Liaoning High Performance Polymer Engineering Research Center, Liaoning Key Laboratory of Polymer Science and Engineering, Dalian Key Laboratory of Membrane Materials and Process, Dalian 116024, China

KeyWords： Copoly(phthalazinone biphenyl ether sulfone); Gelation kinetics; Immersion precipitation; Rheological property

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2022,42(5):1-7

Abstract：

The gelation kinetic process of asymmetric PPBES membrane prepared by immersion precipitation method was investigated through using copoly(phthalazinone biphenyl ether sulfone) (PPBES) as polymer, polyvinyl pyrrolidone (PVP) as additive and N,N- Dimethylacetamide (DMAc) as solvent. The gelation structure of PPBES/PVP/DMAc system was observed by 3D digital microscope, and the formation kinetics factor (De) was calculated to characterize the gelation speed. Effects of PPBES and PVP concentrations and DMAc content in coagulant on the speed and structure were investigated. The relationship between the apparent viscosity of casting solution and the concentration of PPBES/PVP as well as the effect of viscous flow activation energy on De were investigated by digital viscometer. When PPBES concentration increased, De decreased from 10633 μm2/s down to 4599 μm2/s, gelation speed decreased, and the finger-like macropores gradually disappeared. When the PVP content increased, gelation speed first increased and then decreased, resulting in the change fo gelation structure from finger-like pore to sponge-like pore. The gelation speed decreased with an increase of DMAc content in gelation medium. The apparent viscosity was positively correlated with the concentration of PPBES and PVP. The viscous flow activation energy increased with the increase of PPBES concentration, resulting in the reduction of De.

Funds：

国家自然科学基金委创新研究群体项目（22021005），大连市高层次人才创新支持计划（2019RD08）。

AuthorIntro：

王旭（1998-），男，山东德州市人，硕士，从事杂萘联苯聚醚砜中空纤维膜的研究

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