Preparation of hydrophilic poly(vinylidene fluoride) membrane by in-situ grafting of N-vinyl pyrrolidone via a reactive vapor induced phase separation procedure,Journal of Polymer Science

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Preparation of hydrophilic poly(vinylidene fluoride) membrane by in-situ grafting of N-vinyl pyrrolidone via a reactive vapor induced phase separation procedure
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2021-08-17 , DOI: 10.1002/pol.20210446
Rongrong Wang ₁ , Yidan Duan ₁ , Xiaopeng Xiong ₁

Affiliation

Increasing hydrophilicity of hydrophobic membrane is one of the strategies to improve its antifouling performance. Herein we report a procedure of reactive-vapor induced phase separation to prepare an N-vinyl pyrrolidone (NVP) modified poly(vinylidene fluoride) (PVDF) membrane to improve its hydrophilicity. PVDF solution containing NVP monomer was cast in ammonia water vapor atmosphere to prepare the modified membrane. During the process, PVDF was dehydrofluorinated by the reactive vapor of ammonia water to generate double bond of FC═CH, and then NVP was grafted. The degree of grafting modification and the microstructure evolution of the membrane were studied by adjusting the amount of NVP addition. A possible mechanism of membrane formation from crystallization gelling to non-crystallization gelling has been proposed to understand the morphology change from nodular sphere to bi-continuous microstructure with fibril matrix. It has been found that rising the degree of modification has changed the polymorph of PVDF from β to α crystalline phase, as well as turned the hydrophobic PVDF membrane into hydrophilic. Moreover, the modified membrane displayed obvious reduction in bovine serum albumin adsorption, suggesting improvement in anti-fouling performance. Therefore, our work provides an easy strategy to prepare hydrophilic PVDF membrane, which may have promising potential applications.

中文翻译：

N-乙烯基吡咯烷酮通过反应性气相诱导相分离程序原位接枝制备亲水性聚偏二氟乙烯膜

增加疏水膜的亲水性是提高其防污性能的策略之一。在此，我们报告了一种反应性蒸汽诱导相分离的过程，以制备 N-乙烯基吡咯烷酮 (NVP) 改性聚偏二氟乙烯 (PVDF) 膜以提高其亲水性。将含有 NVP 单体的 PVDF 溶液在氨水蒸气气氛中浇铸以制备改性膜。在此过程中，PVDF通过氨水的反应蒸气脱氟化氢生成FC=CH的双键，再接枝NVP。通过调节NVP添加量研究了膜的接枝改性程度和微结构演变。已经提出了从结晶凝胶化到非结晶凝胶化的膜形成的可能机制，以了解从结节球到具有原纤维基质的双连续微观结构的形态变化。已经发现，提高改性程度使 PVDF 的多晶型物从β到α晶相，以及将疏水性 PVDF 膜转变为亲水性。此外，改性膜显示牛血清白蛋白吸附明显减少，表明防污性能有所提高。因此，我们的工作为制备亲水性 PVDF 膜提供了一种简单的策略，可能具有广阔的应用前景。

更新日期：2021-10-15

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