Extraordinary Transport Behavior of Gases in Isothermally Annealed Poly(4-Methyl-1-Pentene) Membranes

doi:10.1002/polb.24150

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Title:	Extraordinary Transport Behavior of Gases in Isothermally Annealed Poly(4-Methyl-1-Pentene) Membranes
Authors:	Fu, Ywu-Jang Lai, Cheng-Lee Hu, Chien-Chieh Sun, Yi-Ming Wu, Shuan-Ying Chen, Jung-Tsai Huang, Shu-Hsien Hung, Wei-Song Lee, Kueir-Rarn
Contributors:	Vanung Univ, Dept Biotechnol Chia Nan Univ Pharm & Sci, Dept Environm Engn & Sci Chung Yuan Christian Univ, Dept Chem Engn, R&D Ctr Membrane Technol Yuan Ze Univ, Dept Chem Engn & Mat Sci
Keywords:	isothermal annealing poly(4-methyl-1-pentene) membranes positron annihilation lifetime spectroscopy three-phase model
Date:	2016-11
Issue Date:	2018-01-18 11:38:06 (UTC+8)
Publisher:	Wiley-Blackwell
Abstract:	Poly(4-methyl-1-pentene) (PMP) membranes were modified through isothermal annealing to investigate the change of their crystalline structure and rigid and mobile amorphous fractions (RAF and MAF), assuming a three-phase model, affected the gas transport behavior. The crystalline structure was characterized by wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS) techniques, and the free volume properties were analyzed by positron annihilation lifetime spectroscopy. Compared with the pristine membrane, the annealed membranes show higher crystallinity; the crystals undergo partial structural change from form III to form I. The lamellar crystal thickness, rigid amorphous fraction thickness, and long period in the lamellar stacks increase with crystallinity. The annealed PMP membranes exhibit higher permeability due to the increase in larger size free volumes in MAF and higher selectivity due to the increase in smaller size free volumes in RAF, respectively. (C) 2016 Wiley Periodicals, Inc.
Relation:	Journal of Polymer Science Part B-Polymer Physics, v.54 n.22, pp.2368-2376
Appears in Collections:	[Dept. of Environmental Engineering and Science (including master's program)] Periodical Articles

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