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Permeability and transport model of epoxy membranes with various surface morphologies

机译:各种表面形态的环氧膜的渗透性和传输模型

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Epoxy membranes that have interconnected pores with different surface structures were synthesized using the chemically induced phase separation process. The epoxy membrane was produced from a mixture of epoxy resin, D.E.R. 331, and the curing agent, 2,4,6-tris-(dimethylaminomethyl) phenol (DMP-30) in diisobutyl ketone, while covered with a contacting film. It was found that the surface morphology of the epoxy membranes could be changed by the fraction of DIBK, or by using different contacting films of which the surface pore sizes ranged from 0.15 through 2.4 μm. Furthermore, ethanol permeabilities through the epoxy membranes were measured. The permeabilities are approximately 3-4700 L/m~2 h bar and depend on either the bulk morphology or the skin structure of the membranes. The epoxy membranes with various porosities and ethanol permeabilities could be also prepared using different compositions of the DMP-30 and diethylene triamine (DETA)) mixture. A modified Hagen-Poiseuille equation was proposed to describe the effects of the surface and bulk porosity on ethanol permeability. It was found that at low permeabilities, most of the resistance of the surface layers is higher than that of the bulk section.
机译:使用化学诱导的相分离方法合成了具有相互连通的孔且具有不同表面结构的环氧树脂膜。环氧膜由环氧树脂D.E.R. 331和固化剂二异丁基酮中的2,4,6-三-(二甲基氨基甲基)苯酚(DMP-30),同时覆盖有接触膜。发现通过DIBK的比例或通过使用不同的接触膜可以改变环氧膜的表面形态,所述接触膜的表面孔径在0.15至2.4μm之间。此外,测量了乙醇通过环氧膜的渗透性。渗透率约为3-4700 L / m〜2 h bar,取决于膜的整体形态或表皮结构。也可以使用不同组成的DMP-30和二亚乙基三胺(DETA)混合物制备具有不同孔隙率和乙醇渗透性的环氧膜。提出了改进的Hagen-Poiseuille方程来描述表面和整体孔隙率对乙醇渗透性的影响。已经发现,在低渗透率下,表面层的大部分电阻高于主体部分的电阻。

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