PVDF Membrane formation by diffusion induced phase sparation-morphology prediction based on phase behavior and masss transfer modeling
學年 87
學期 1
出版（發表）日期 1999-01-01
作品名稱 PVDF Membrane formation by diffusion induced phase sparation-morphology prediction based on phase behavior and masss transfer modeling
作品名稱（其他語言）
著者 Cheng, Liao-ping; Lin, Dar-jong; Shih, Chien-hsieh; Dwan, An-hwa; Gryte, Carl C.
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 37(16), pp.2079-2092
摘要 The equilibrium phase behavior of water (nonsolvent)-DMF (solvent)-PVDF system at 25°C was investigated via both theoretical and experimental approaches. Using binary interaction parameters, χij, obtained previously, the theoretical phase boundaries were computed and were found to match closely the measured binodal and crystallization-induced gelation data. Membranes were prepared using the isothermal immersion-precipitation processes in various dope and bath conditions. The formed membranes demonstrated a broad spectrum of morphologies: At one extreme, asymmetric structure was obtained featuring a continuous tight skin and a sublayer composed of parallel macrovoids and cellular pores; at the other limit, skinless microporous membrane was produced with spherical particles packed into a bi-continuous structure. The crystalline characters of PVDF gels and membranes were examined by small angle light scattering, scanning electron microscopy, and differential scanning calorimetry techniques. In addition, diffusion trajectories and concentration profiles in the membrane solution before precipitation were calculated for the immersion process. These results predicted reasonably the various morphologies observed in the membranes
關鍵字 poly(vinylidene fluoride); membrane; phase diagram; immersion precipitation; diffusion
語言 en
ISSN 1099-0488
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度
國別 USA
公開徵稿
出版型式 紙本
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