Structure-gas Transport Property Relationship of Hyperbranched Polyimide-silica Hybrid Membranes

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  • Miki Masako
    R&D Center for Nanomaterials and Devices, Kyoto Institute of Technology
  • Suzuki Tomoyuki
    Knowledge Hub Aichi, Priority Research Projects, Aichi Science & Technology Foundation,
  • Yamada Yasuharu
    Institue of Technological Research, Kanagawa University

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Physical and gas transport properties of amine-terminated hyperbranched polyimide-silica hybrid (AM-HBPI-silica hybrid) membranes prepared with a dianhydride, 4,4’-(hexafluoroisopropylidene)diphthalic anhydride, and a triamine, 1,3,5- tris(4-amino-phenoxy)benzene, were investigated and compared with those of dianhydride-terminated hyperbranched polyimide-silica hybrid (DA-HBPI-silica hybrid) membranes. HBPI-silica hybrid membranes were prepared via sol-gel reaction using hyperbranched polyamic acid of which end groups were modified with silane coupling agents, water and tetramethoxysilane. Although the AM-HBPI membrane was colored to dark brown, optical transmittances of AM-HBPI-silica hybrid membranes increased with increasing silica content. Thermal and dimensional stability of AM-HBPI-silica hybrids are higher than those of DA-HBPI-silica hybrids because of the rigidity of AM-HBPI molecular chains which contain more branching units. Gas permeability and CO2/CH4 selectivity of DA- and AM-HBPI-silica hybrid membranes increased with increasing silica content. Especially, CO2/CH4 selectivity of AM-HBPI-silica hybrid membranes remarkably increased with increasing silica content. This behavior is probably due to the characteristic distribution and interconnectivity of free volume holes created by the incorporation of silica and the high affinity of hydroxyl groups remaining in the silica domain to CO2.

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