Son, WI Hong, JM Kim, BS 2024-01-21T05:31:11Z 2024-01-21T05:31:11Z 2021-09-03 2005-03 0256-1115 https://pubs.kist.re.kr/handle/201004/136695 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 similar to 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 angstrom to 3.67 angstrom 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 O-2/N-2=17.2 and permeability for O-2 was 40.2 barrer. English KOREAN INSTITUTE CHEMICAL ENGINEERS GAS SEPARATION Polypyrrole composite membrane with high permeability prepared by interfacial polymerization Article 10.1007/BF02701499 1 KOREAN JOURNAL OF CHEMICAL ENGINEERING, v.22, no.2, pp.285 - 290 KOREAN JOURNAL OF CHEMICAL ENGINEERING 22 2 285 290 scie scopus kci ART001115038 000228280600019 2-s2.0-20344407812 Chemistry, Multidisciplinary Engineering, Chemical Chemistry Engineering Article GAS SEPARATION polypyrrole interfacial polymerization gas separation ultra-thin