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首页> 外文期刊>Journal of Applied Polymer Science >Fabrication and structural tuning of novel composite hollow fiber membranes for pervaporation
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Fabrication and structural tuning of novel composite hollow fiber membranes for pervaporation

机译：新型复合中空透气膜的制备与结构优化

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A series of polysiloxaneimide (PSI)/polyetherimide (PEI) composite hollow fibers were fabricated by coextrusion and phase inversion. The hydrophobic PSI outer layer was set as the selective layer which was supported by the PEI inner layer. The PSI was synthesized by polycondensation of 3,3,4,4-Biphenyltetracarboxylic Dianhydride (BPDA) with amino siloxane X-22-161A and a chain extender, 1,3-Bis (3-aminopropyl) -1,1,3,3-tertramethyldisiloxane (BATS). It was found that the macroscopic uniformity of PSI layer was dependent on the dope formulation, coagulant composition and dope flow rate: (1) the higher similarity degree of the solvent(s) for different layers in terms of solubility parameters, (2) the utilization of surfactant as a component in the water coagulant, and (3) higher flow rates of the outer layer dopes, led to the formation of more uniform and smoother PSI outer layer. The maximum outer layer thickness was around 2 m. The bulk of the PEI layers were porous with finger like macrovoids. The outer surface of the inner PEI layer for some batches of the hollow fibers was confirmed to be porous. The original dual-layer hollow fibers showed poor pervaporation performance. Post treatment was applied to cure the hollow fiber, delivering composite membranes with performance dominated by the coating material of PDMS. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43324.
机译：通过共挤出和相转化制备了一系列的聚硅氧烷酰亚胺（PSI）/聚醚酰亚胺（PEI）复合中空纤维。将疏水性PSI外层设置为由PEI内层支撑的选择层。通过3,3,4,4-联苯四甲酸二酐（BPDA）与氨基硅氧烷X-22-161A和扩链剂1,3-双（3-氨基丙基）-1,1,3的缩聚反应合成PSI 3-叔甲基二硅氧烷（BATS）。发现PSI层的宏观均匀性取决于浓液配方，凝结剂组成和浓液流速：（1）就溶解度参数而言，不同层的溶剂的相似度更高，（2）利用表面活性剂作为水凝结剂的成分，以及（3）外层涂料的流速较高，导致形成了更均匀，更光滑的PSI外层。外层的最大厚度约为2 m。 PEI层的大部分是多孔的，有手指状的大孔。对于一些批次的中空纤维，证实内部PEI层的外表面是多孔的。原始的双层中空纤维显示出差的全蒸发性能。进行后处理以固化中空纤维，以PDMS涂层材料为主的性能输送复合膜。 （c）2016 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，133，43324。

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