聚砜
膜
衰减全反射
X射线光电子能谱
傅里叶变换红外光谱
分析化学(期刊)
扫描电子显微镜
化学
化学工程
选择性
材料科学
红外光谱学
有机化学
复合材料
生物化学
工程类
催化作用
作者
J. M. Mohr,Donald R Paul,Ingo Pinnau,William J. Koros
标识
DOI:10.1016/0376-7388(91)85016-x
摘要
Asymmetric polysulfone membranes were surface fluorinated using a fixed set of treatment conditions and the transport of six gases was measured. After 2 and 5 min of fluorination the membranes show a significantly reduced ratio of permeability and effective skin thickness (P/l) and an improved selectivity for certain gas pairs like hydrogen, helium, and carbon dioxide relative to methane. There is some variability in the H2/CH4 selectivity improvement observed but, in general, it increases 2–3 fold for membranes fluorinated for 5 min and 2–5 fold for those fluorinated for 2 min. In order to gain insight about the fraction of the asymmetric membrane thickness that is being fluorinated and to determine the chemical nature of the fluorinated layer, thick (76 μm) isotropic films of polysulfone were fluorinated from one side only for a wide range of times. The chemical composition and structure of the fluorinated layer were determined from bulk elemental analysis and Fourier transform infrared spectroscopy-attenuated total reflection (FTIR-ATR). X-ray photoelectron spectroscopy (XPS) was also used to determine the chemical composition at the surface of asymmetric membranes and the thick films. The fluorinated surface of selected membranes was examined by scanning electron microscopy.
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