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| 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 |
| 顯示於類別: | [環境工程與科學系(所)] 期刊論文
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