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含氟聚醚醚酮非对称膜的制备及气体分离性能研究
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摘要
本论文通过亲核缩聚反应合成含三氟甲基苯基侧基的聚醚醚酮,并作为制膜材料,通过干湿相转化法制备具有致密表皮层和多孔支撑层的非对称膜。支撑层的多孔结构能够显著降低分离膜的有效厚度,进而达到提高气体分离膜透过性的目的,而致密皮层的存在保持了聚合物原有的分离效果。采用的铸膜液为聚合物-溶剂-醇类添加剂三元体系,醇类添加剂的加入促进了多孔层的形成,而且醇的种类和添加量影响着孔径的形态和尺寸,本论文通过扫描电子显微镜和原子力显微镜等微观形貌表征对此进行了详细讨论。气体分离性能测试表明由于多孔支撑层对气体透过的促进,非对称膜的气体渗透速率和致密膜相比大幅提高,并且随着添加量的增加而提高,可以归因于孔隙率随添加量的提高。
In this study,poly(ether ether ketone) contained trifluoromethyl phenyl groups was synthetized by nucleophilic polycondensation as membrane material.The asymmetric membranes prepared via dry-wet method contain defect-free skin and porous support layer.The cross-section and surface of membranes were characterized by SEM and AFM respectively.The separation performance of asymmetric membranes was tested in terms of gas permeability and selectivity for He,CO_2,O_2 and N_2 by the constant volume method.We could find the permeability of asymmetric membranes was obviously higher than the dense membrane while the separation decreased slightly.The membranes in Series 2 showed higher permeability for each gas while the separability for gas pair CO_2/O_2 increased comparing with the dense membrane.
引文
[1].Liu B.;Wang G.;Hu W.J.Polym.Sci.,Part A:Polym.Chem,2002,40:3392.
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