Effect of Fabrication and Operation Conditions on CO2 Separation Performance of PEO鈥揚A Block Copolymer Membranes

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• 作者：Yuanyuan Wang ; Hongyu Li ; Guangxi Dong ; Colin Scholes ; Vicki Chen
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：July 29, 2015
• 年：2015
• 卷：54
• 期：29
• 页码：7273-7283
• 全文大小：544K
• ISSN：1520-5045

文摘

Poly(ethylene oxide)- (PEO-) based block copolymer membranes have great potential for use in CO₂ separation because of their excellent selectivity and moderate permeability. Whereas numerous studies have focused on the permeation performance of such membranes, the influence of the microphase-separated structures on the gas transport is not well understood. This study examined the phase structure of PEO鈥損olyamide (PA) (commercial name, Pebax) block copolymer membranes by scanning probe microscopy (SPM) imaging and thermal analysis. The membranes with the irregular and more disordered phase-separated structure, such as Pebax-1074 membranes, that had longer PA chains and were made using a faster sol-to-gel transition process resulted in higher CO₂ permeability than the membranes with the more ordered phase structure. The CO₂ solubility coefficient profile as a function of pressure in the Pebax membranes with dual-mode sorption characteristics indicated the involvement of a glassy hard phase in CO₂ transport, particularly at low pressure. The effects of temperature on gas transport and separation performance for a CO₂/N₂ gas mixture were also investigated.