The aim of this work is to study the effect of membrane thickness with respect to gas permeance and tensile strength. The influence of membrane thickness on gas permeation has received little attention to date. Single layer flat sheet membrane with average thickness of 25 μm and dual layer composite membranes with variable thickness of skin layer were fabricated by coating CA/ PEG selective layer on the polyvinylidene fluoride porous support. Permeation experiments were performed with CO₂ and CH₄ which revealed that permeance of CO₂ was pronounced compared to CH₄. Highest permeance of 0.87 gas permeation unit (GPU) was obtained at 4 bar with 19.4 μm skin layer. Fourier transform infra-red spectroscopy was used to study the existence of different functional groups in the membranes. Strength of the membranes was analyzed using tensile testing machine. Scanning electron microscopy was used to study the surface structure and morphology. It was found that by reducing the membrane thickness, the permeance of CO₂ and CH₄ increased without compromising on membrane strength.

这项工作的目的是研究膜厚度对透气性和抗张强度的影响。迄今为止，膜厚度对气体渗透的影响很少受到关注。通过在聚偏二氟乙烯多孔载体上涂覆CA/PEG选择性层，制备了平均厚度为25μm的单层平板膜和表层厚度可变的双层复合膜。用 CO ₂和 CH ₄进行渗透实验，结果表明 CO _{2 的}渗透性比 CH _{4 显着}. 0.87 气体渗透单元 (GPU) 的最高渗透率在 4 bar 下获得，表层为 19.4 μm。傅里叶变换红外光谱用于研究膜中不同官能团的存在。使用拉伸试验机分析膜的强度。扫描电子显微镜用于研究表面结构和形态。发现通过降低膜厚度，CO ₂和CH ₄的渗透性增加而不影响膜强度。