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• W1966339062 abstract "The evolution of physicochemical and gas transport properties of thermally rearranged polyhydroxyamide (PHA) as a function of temperature have been systematically investigated in the present work. Besides the degree of conversion, it is revealed that thermal cyclization temperature plays the other determining factor during the rearrangement process since not only could it affect the degree of thermal conversion, but also influences thermal history and introduces thermal crosslinking. By thermally cyclizing the PHA precursor membranes at different temperatures in the range of 300–450 °C, similar degrees of chemical structure conversion (∼91%) have been achieved, while enhanced gas separation properties are found in the membrane thermally cyclized at a higher temperature. Analyses based on membrane physical properties and glass transition behavior prove that the aforementioned phenomenon is attributed to the suppression of polymer chain segmental rotation and the lower chain packing density induced by a higher thermal cyclization temperature. The gas sorption and diffusion characteristics of CO2/CH4 further elucidate that the amplification of membrane fractional free volume has a greater impact on diffusivity selectivity than solubility selectivity. The dual-mode sorption data confirm that the transformation of gas transport properties is attributed to the changes in both Henry's molecular dissolution and Langmuir sorption, which are closely related to the membrane physical properties." @default.
• W1966339062 created "2016-06-24" @default.
• W1966339062 creator A5009988205 @default.
• W1966339062 creator A5080617989 @default.
• W1966339062 date "2011-12-01" @default.
• W1966339062 modified "2023-09-25" @default.
• W1966339062 title "The evolution of physicochemical and gas transport properties of thermally rearranged polyhydroxyamide (PHA)" @default.
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• W1966339062 doi "https://doi.org/10.1016/j.memsci.2011.09.023" @default.
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