We report poly(vinylidene-co-hexafluoropropylene) (PVDF-co-HFP) flat sheet membranes incorporated with poly(ethylene glycol) (PEG) of varied molecular weights and concentrations, was incorporated in PVDF-co-HFP matrix by solution blending to achieve fine control over membrane pore size, porosity and PSD, which are essential requirements for high-performance VMD desalination. Prepared membranes were characterized by surface morphology, porosity, pore size and distribution, hydrophobicity, thermal and dimensional stability. Membrane porosity and thus permeate flux was increased with the concentration of PEG in the membrane matrix. A technique for order preference by similarity to the ideal solution (TOPSIS) was used to predict the most suitable membrane for water desalination by VMD. Reported M3 membrane (20 wt% PVDF-co-HFP + 10 wt% PEG-400) showed superior performance (>99.8% salt rejection, and 19.72 l m^-2h⁻¹) in comparison to other PVDF based flat sheet membranes reported in the literature. A three-dimensional comprehensive computational fluid dynamics (CFD) model is also presented to describe the vapour flux profile in the VMD process with reasonable accuracy. Membrane based on PVDF-co-HFP copolymer incorporated with PEG showed longevity up to more than 100 hrs and assessed as promising membrane material for VMD process because of interconnected pore structure and narrow pore distribution.

我们报道了聚（亚乙烯基-共-六氟丙烯）（PVDF-co-HFP）平板膜与不同分子量和浓度的聚（乙二醇）（PEG）结合，通过溶液共混到PVDF-co-HFP基质中实现对膜孔径，孔隙率和PSD的精细控制，这是高性能VMD脱盐的基本要求。制备的膜的特征在于表面形态，孔隙率，孔径和分布，疏水性，热和尺寸稳定性。随着膜基质中PEG浓度的增加，膜的孔隙率和渗透通量都增加了。通过与理想相似来进行订单偏好的技术溶液（TOPSIS）用于预测最适合VMD脱盐的膜。报告的M3膜（20 wt％PVDF-co-HFP + 10 wt％PEG-400）显示出优于其他报道的基于PVDF的平板膜性能（> 99.8％脱盐率和19.72 l m ^-2 h ^-1）。文献。还提出了三维综合计算流体动力学（CFD）模型，以合理的精度描述了VMD过程中的蒸汽通量分布。基于PVDF-co-HFP共聚物并结合PEG的膜的使用寿命长达100多个小时，由于具有相互连接的孔结构和狭窄的孔分布，因此被认为是用于VMD工艺的有前途的膜材料。