膜科学与技术

浸没沉淀法制备杂萘联苯共聚醚砜膜的凝胶动力学研究

作者：王旭，张守海，张瑛楠，徐培琦，刘乾，蹇锡高

单位：大连理工大学化工学院，辽宁省高性能树脂工程技术研究中心，辽宁省高分子科学与工程重点实验室，大连市膜材料与膜过程重点实验室，大连 116024

关键词：杂萘联苯共聚醚砜；凝胶动力学；浸没沉淀法；流变学

出版年,卷(期):页码： 2022,42(5):1-7

摘要：

以杂萘联苯共聚醚砜（PPBES）为聚合物，聚乙烯吡咯烷酮（PVP）为添加剂，N,N-二甲基乙酰胺（DMAc）为溶剂，对浸没沉淀法制备PPBES非对称膜的凝胶动力学进行研究。采用3D数字显微镜观察了PPBES/PVP/DMAc体系的凝胶过程，并计算成膜动力学因子（De）以表征凝胶速度，系统考察了聚合物、添加剂浓度及凝胶介质中溶剂含量对PPBES铸膜液凝胶化速度和结构的影响。采用数字粘度计探究铸膜液表观粘度与PPBES和PVP浓度的关系，以及粘流活化能对De的影响。结果表明，PPBES浓度增大，De由10633 μm2/s降至4599 μm2/s，凝胶速度降低，指状大孔逐渐消失；PVP含量增加，凝胶速度先增大后降低，凝胶结构从指状孔转变为海绵孔；凝胶介质中DMAc的含量增加，凝胶速度降低。混合溶液的表观粘度与PPBES和PVP浓度呈正相关关系；PPBES浓度升高，聚合物溶液的粘流活化能增大，De下降。

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.

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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