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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/30927


    標題: Extraordinary Transport Behavior of Gases in Isothermally Annealed Poly(4-Methyl-1-Pentene) Membranes
    作者: 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
    貢獻者: 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
    關鍵字: isothermal annealing
    poly(4-methyl-1-pentene) membranes
    positron annihilation lifetime spectroscopy
    three-phase model
    日期: 2016-11
    上傳時間: 2018-01-18 11:38:06 (UTC+8)
    出版者: Wiley-Blackwell
    摘要: 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.
    關聯: Journal of Polymer Science Part B-Polymer Physics, v.54 n.22, pp.2368-2376
    Appears in Collections:[環境工程與科學系(所)] 期刊論文

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