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- W2904441600 abstract "Abstract Since thermally rearranged (TR) polymers were known as high gas permeable and processable materials, fabricating high performance hollow fiber (HF) membranes have been tried using them. However, an unexpected drawback emerged which is the gas productivity loss by thermal densification of skin layers during thermal treatment above their glass transition temperature (Tg). In this work, we used a recently reported crosslinked-TR (XTR) polybenzoxazole to develop a new class of high-flux TR hollow fibers by directly exploiting the thermal densification phenomenon. The TR temperature range (320–460 °C) and Tg (394 °C) were determined by thermal gravimetric analysis (TGA) and dynamic mechanical analysis (DMA). The chain rigidity of the XTR polymer increased during an isotherm treatment at its Tg, suggesting a restricted densification. Surprisingly, the undesired pinhole-defects (pore diameter 400 °C), forming an ultrathin defect-free skin layer on thermally-densified XTR hollow fiber membranes. The pore-healed XTR hollow fibers exhibited an outstanding CO2 permeance of ~2300 GPU and a CO2/N2 selectivity of 17.4 with a skin thickness of 103 nm." @default.
- W2904441600 created "2018-12-22" @default.
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- W2904441600 date "2019-03-01" @default.
- W2904441600 modified "2023-10-16" @default.
- W2904441600 title "Densification-induced hollow fiber membranes using crosslinked thermally rearranged (XTR) polymer for CO2 capture" @default.
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- W2904441600 doi "https://doi.org/10.1016/j.memsci.2018.12.023" @default.
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