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Enhancing Structural Stability and Pervaporation Performance of Composite Membranes by Coating Gelatin onto Hydrophilically Modified Support Layer

ISSN号：1004-9541
期刊名称：《中国化学工程学报：英文版》
时间：0
分类：TQ326.9[化学工程—合成树脂塑料工业] TQ325.14[化学工程—合成树脂塑料工业]
作者机构：[1]Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering andTechnology, Tianjin University, Tianjin 300072, China, [2]Synergetic'innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China, [3]Tianjin Key Laboratory of Membrane Science & Desalination Technology, Tianjin 300072, China
相关基金：Supported by the New Century Excellent Talents in University （NCET-10-0623）, National Natural Science Foundation for Distinguished Young Scholars （21125627）, National Basic Research Program of China （2009CB623404）, and State Key Laboratory for Modification of Chemical Fibers and Polymer Materials （Dong Hua University）.

作者：吴洪, 芦霞, 李宪实, 李奕帆, 赵翠红, 姜忠义

关键词：渗透汽化性能, 结构稳定性, 亲水改性, 复合膜, 明胶, X-射线光电子能谱, PVA改性, 界面相容性, surface segregation, composite membrane, interfacial stability, pervaporation, ethanol dehydration

中文摘要：

合成的膜的界面的相容性是到它的结构的稳定性和分离性能的一个重要因素。在这研究，(醚 sulfone )( 足) poly 支持层第一吸水地被修改与(乙烯基白酒)(PVA ) poly 在阶段倒置期间经由表面分离处理。当活跃的层由 crosslinking 列在后面为乙醇脱水制作合成的膜，明胶(GE ) 然后在修改 PVA 的足支持层上被扔。支持层的表面上的 PVA 的丰富改进了同样准备的 GE/PVA-PES 合成的膜的界面的相容性。水接触角度测量和 X 光检查光电子光谱学(XPS ) 数据与 80% 的表面范围密度证实了 PVA 的表面分离。T 剥测试证明分开支持层和活跃的层的最大的力量与 GE/PES 膜相比到 3 次被提高。在支持层， GE 活跃的层的 crosslinking 和 pervaporative 脱水性能上的操作参数的 PVA 内容的效果被调查。合成的膜的运作的稳定性被在乙醇沉浸膜测试时间的一个时期的水的答案。为 90% 乙醇答案的脱水的稳定的 pervaporation 性能与 60 的一个分离因素和 1910 g 的浸透流动为 GE/PVA-PES 膜被获得吗？

英文摘要：

The interfacial compatibility of composite membrane is an important factor to its structural stability, andseparation performance. In this study, poly （ether sulfone）（PES） support layer was first hydrophilically modified with poly（vinyl alcohol）（PVA） via surface segregation during the phase inversion process. Gelatin （GE） was then cast on the PVA-modified PES support layer as the active layer followed by crosslinking to fabricate composite membranes for ethanol dehydration. The enrichment of PVA on the surface of support layer improved interfacial compatibility of the as-prepared GE/PVA-PES composite membrane. The water contact angle measurement and X-ray photoelectron spectroscopy （XPS） data confirmed the surface segregation of PVA with a surface coverage density of -80%. T-peel test showed that the maxima/force to separate the support layer and the active layer was enhanced by 3 times compared with the GE/PES membrane. The effects of PVA content in the support layer, crosslinking of GE active layer and operating parameters on the pervaporative dehydration performance were investigated. The operational stability of the composite membrane was tested by immersing the membrane in ethanol aqueous solution for a period of time. Stable pervaporation performance for dehydration of 90% ethanol solution was obtained for GE/PVA-PES membrane with a separation factor of -60 and a permeation flux of -1910 g.m^-2.h1 without peeling over 28 days immersion.