Effect of postcasting heat-treatment on the structure and properties of semicrystalline phase-inversion poly(vinylidene fluoride) membranes
學年 98
學期 1
出版（發表）日期 2009-10-01
作品名稱 Effect of postcasting heat-treatment on the structure and properties of semicrystalline phase-inversion poly(vinylidene fluoride) membranes
作品名稱（其他語言）
著者 Lin, Dar-Jong; Chang, Hsu-Hsien; Konstantinos Beltsios; Don, Trong-Ming; Jeng, Yi-Su; Cheng, Liao-Ping
單位 淡江大學化學工程與材料工程學系
出版者 Hoboken: John Wiley & Sons, Inc.
著錄名稱、卷期、頁數 Journal of Polymer Science Part B: Polymer Physics 47(19), pp.1880–1893
摘要 Microporous PVDF membranes were prepared by immersion-precipitation in 1-octanol of casting dopes dissolved at different temperatures, with dissolution temperature affecting strongly the membrane microstructure. The effect of postcoagulation thermal annealing, which is an additional thermal parameter, on membrane microstructure and properties is probed herein. Membranes obtained were annealed at temperatures up to 160 °C, which is close to the melting point of PVDF polymer. Annealing leads to a substantial modification of the nano-scale fine structure of the membranes, while the overall-microporous structure is preserved. At elevated annealing temperatures, nano-grains, fibrils, and stick-like crystalline entities gradually eclipse, while globules develop more robust connections based on wide bands of crystal elements. Probing by X-ray diffraction and dynamic scanning calorimetry shows that crystallinity increases when annealing temperature and time are increased. As regards mechanical properties, the tensile strength of the membranes can be enhanced substantially, up to about 10 times, upon appropriate high temperature prolonged annealing.
關鍵字 annealing; melting point; membranes; microstructure; X-ray
語言 en
ISSN 0887-6266; 1099-0488
期刊性質 國外
收錄於 SCI EI
產學合作
通訊作者 Cheng, Liao-Ping
審稿制度
國別 USA
公開徵稿
出版型式 電子版
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