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首页> 外文期刊>Applied Sciences >Improving Liquid Entry Pressure of Polyvinylidene Fluoride (PVDF) Membranes by Exploiting the Role of Fabrication Parameters in Vapor-Induced Phase Separation VIPS and Non-Solvent-Induced Phase Separation (NIPS) Processes
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Improving Liquid Entry Pressure of Polyvinylidene Fluoride (PVDF) Membranes by Exploiting the Role of Fabrication Parameters in Vapor-Induced Phase Separation VIPS and Non-Solvent-Induced Phase Separation (NIPS) Processes

机译：通过利用制造参数在气相诱导相分离VIPS和非溶剂诱导相分离（NIPS）工艺中的作用来提高聚偏二氟乙烯（PVDF）膜的液体进入压力

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摘要

Polyvinylidene fluoride (PVDF) is a popular polymer material for making membranes for several applications, including membrane distillation (MD), via the phase inversion process. Non-solvent-induced phase separation (NIPS) and vapor-induced phase separation (VIPS) are applied to achieve a porous PVDF membrane with low mass-transfer resistance and high contact angle (hydrophobicity). In this work, firstly, the impacts of several preparation parameters on membrane properties using VIPS and NIPS were studied. Then, the performance of the selected membrane was assessed in a lab-scale direct-contact MD (DCMD) unit. The parametric study shows that decreasing PVDF concentration while increasing both relative humidity (RH) and exposure time increased the contact angle and bubble-point pore size (BP). Those trends were investigated further by varying the casting thickness. At higher casting thicknesses and longer exposure time (up to 7.5 min), contact angle (CA) increased but BP significantly decreased. The latter showed a dominant trend leading to liquid entry pressure (LEP) increase with thickness.
机译：聚偏二氟乙烯（PVDF）是一种流行的聚合物材料，可通过相转化工艺为多种应用制造膜，包括膜蒸馏（MD）。应用非溶剂诱导的相分离（NIPS）和气相诱导的相分离（VIPS），以实现具有低传质阻力和高接触角（疏水性）的多孔PVDF膜。在这项工作中，首先，研究了使用VIPS和NIPS的几种制备参数对膜性能的影响。然后，在实验室规模的直接接触MD（DCMD）装置中评估所选膜的性能。参数研究表明，降低PVDF浓度，同时增加相对湿度（RH）和暴露时间会增加接触角和泡点孔径（BP）。通过改变铸件厚度进一步研究了这些趋势。在较高的铸件厚度和较长的暴露时间（最长7.5分钟）下，接触角（CA）增大，但BP显着降低。后者显示出主导趋势，导致液体入口压力（LEP）随着厚度增​​加。

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