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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received November 26, 2004
Accepted December 20, 2004

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Polypyrrole Composite Membrane with High Permeability Prepared by Interfacial Polymerization

Won-Il Son Jae-Min Hong¹ Byoung-Sik Kim^†

Department of Chemical Engineering, Dongguk University, Pil-dong, Chung-gu, Seoul 100-715, Korea ¹Optoelectronic Materials Center, Korea Institute of Science and Technology, P.O box 131, Cheongryang, Seoul 130-650, Korea

bskim@dongguk.edu

Korean Journal of Chemical Engineering, March 2005, 22(2), 285-290(6), 10.1007/BF02701499

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Abstract

Novel polypyrrole (PPy)/polydimethylsiloxane (PDMS) composite membrane was prepared by interfacial polymerization to make a very effective gas separation membrane. We found that Polymerized PPy films as thin as ~200 nm could be chemically synthesized as freestanding membranes by using the interfacial polymerization technique. Additionally, we show that difference morphology of PPys films was obtained by controlling polymerization rate and more dense films were formed at low polymerization rate. Wide X-ray diffraction study showed the d spacing value of the PPy film decreased from 4.89 Å to 3.67 Å by the rate of polymerization decreases. According to d spacing value decrease, selectivity of a PPy composite membrane was increased dramatically and permeability was reduced gradually. This high selectivity was derived from d spacing closed to the kinetic diameter of nitrogen. These results indicated that the permeability is controlled by the diffusion coefficient, reflecting the packed structure of the PPy film. The highest selectivity value of composite membrane that was prepared by interfacial polymerization was O2/N2=17.2 and permeability for O2 was 40.2 barrer.

Keywords

Polypyrrole Interfacial Polymerization Gas Separation Ultra-thin

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