Isomer Effects on Gas Transport Properties of Polybenzoxazole-Silica Hybrid Membranes

Gas transport properties of novel polybenzoxazole (PBO) – silica hybrid membranes with a para-substituted structure were investigated. The PBO prepared poly(o-hydroxy amide) as precursor polymer and tetraethoxysilane (TEOS) via thermal oxazolization sol-gel processes. neat treated at different temperatures showed higher fractional free volumes than corresponding meta-substituted reported previously. permeability the increased increasing temperature content. was brought by inter-molecular chain distance volume holes formed / interfaces. It worth noting that simultaneous enhancements CO2 CO2/CH4 selectivity, suggesting improved size-selective separation ability concluded possessed prominent gas expected to apply high-performance membranes.