PES/PVP/DMAc溶液的流变行为及PVP对中空纤维膜的结构调控,Journal of Applied Polymer Science

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PES/PVP/DMAc溶液的流变行为及PVP对中空纤维膜的结构调控
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2022-08-08 , DOI: 10.1002/app.52870
Lu Zhang ₁ , Haoran Zhang ₁ , Jinhu Jiang ₁ , Dong Zhao ₁ , Chunyin Shen ₁ , Shangwen Zha ₂ , Shaoyi Qu ₂ , Ru Lin ₂ , Yanli Wang ₁ , Gance Dai ₁

Affiliation

流变学研究对中空纤维膜纺丝过程和膜结构调控具有重要作用。在这项工作中，通过旋转流变仪系统地研究了添加聚乙烯吡咯烷酮（PVP-K30、PVP-K60 和 PVP-K90 等级）的聚醚砜 (PES) 纺丝溶液的流变行为，以了解 PES 膜结构如何变化。结果表明，可变分子量的 PVP 改变了 PES 纺丝溶液的流变性能，如粘度 ( η _a )、非牛顿指数 ( n )、流动活化能 ( E _η )、结构粘度指数 ( Δη )、储能模量（G'）和损耗模量（G''）。与 PVP-K30 的混合物表现出最佳的可纺性，但手指状的膜结构不适合血液透析。PES/PVP-K60和PES/PVP-K90的流变行为表明，提高剪切速率和温度是提高混合物可纺性和调节膜结构的有效途径。同时，将临界浓度的 PVP-K60 或 PVP-K90 添加到 PES 溶液中可以制备具有海绵状结构的中空膜。PVP-K90结合了可纺性和膜结构，是一种合适的血液透析膜添加剂。

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Rheological behavior of PES/PVP/DMAc solution and PVP structural regulation for hollow fiber membrane

Rheological study plays a significant role in hollow fiber membrane spinning process and membrane structure regulation. In this work, the rheological behaviors of polyethersulfone (PES) spinning solutions added the polyvinylpyrrolidone (grade of PVP-K30, PVP-K60, and PVP-K90) were systematically investigated by rotational rheometry to understand how the PES membrane structure changes. Results show that PVP of variable molecular weights change the rheological properties of PES spinning solution, such as the viscosity (η_a), non-Newtonian index (n), flow activation energy (E_η), structural viscosity index (∆η), storage modulus (G′), and loss modulus (G′′). The mixture with PVP-K30 exhibits optimal spinnability but the finger-like membrane structure is undesirable for the hemodialysis. The rheological behaviors of PES/PVP-K60 and PES/PVP-K90 reveal that increasing shear rate and temperature are effective ways to improve the spinnability of the mixture and the membrane structure is regulated. Meanwhile, the addition of PVP-K60 or PVP-K90 at their critical concentration to the PES solution can fabricate a hollow membrane with a sponge-like structure. Combining spinnability and membrane structure, PVP-K90 is a suitable additive for the hemodialysis membrane.

更新日期：2022-08-08

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