INVESTIGATION OF SWELLING EFFECT ON FINE STRUCTURE AND PERVAPORATION PERFORMANCE OF INTERFACIALLY-POLYMERIZED POLYAMIDE COMPOSITE MEMBRANE BY USING POSITRON ANNIHILATION SPECTROSCOPY CHARACTERIZATION
The free volume sizes and distributions and multilayer structures in asymmetric thin layer polyamide membranes in the wet state have been first time measured using the variable monoenergy slow positron beam (VMSPB). This paper presents a newly developed method, which combines the technique of plasma enhanced chemical vapor deposition to form a barrier layer for high vacuum condition to seal the composite polyamide and of interfacial polymerization between 2-aminoethanethiol (AETH) and trimesoyl chloride (TMC) on the surface of modified asymmetric polyacrylonitrile (mPAN) membrane (AETH-TMC/mPAN), under the wet condition encountered during the pervaporation process in which they are in direct contact with the liquid environment provided by the feed solution. During the VMSPB experiments under a high vacuum, our new method maintained the TFC membrane in the wet conditions typically experienced in VMSPB experiments wherein it directly contacts the liquid feed environment, which is essential in the course of real measurements as there is a high interaction between the feed solution and the membrane. The results of free volumes and layer structures in the wet state are compared with the dry sate and are supported by the results using SEM, FTIT-ATR, and XPS methods.
Wei-Song Hung Manuel De Guzman Shu-Hsien Huang Kueir-Rarn Lee Y.C.Jean Juin-Yih Lai
R&D Center for Membrane Technology, Department of Chemical Engineering, Chung Yuan University, Chung Department of Chemical and Materials Engineering, National Han University, I-Lan 26047, Taiwan R&D Center for Membrane Technology, Department of Chemical Engineering, Chung Yuan University, Chung
国际会议
International Symposium on Polymer Chemistry(第四届国际高分子化学学术研讨会 PC 2010)
苏州
英文
436-437
2010-06-02（万方平台首次上网日期，不代表论文的发表时间）