教師資料查詢 | 類別: 期刊論文 | 教師: 鄭廖平 CHENG, LIAO-PING (瀏覽個人網頁)

標題:Preparation and characterization of microporous PVDF/PMMA composite membranes by phase inversion in water/DMSO solutions
學年95
學期1
出版(發表)日期2006/10/01
作品名稱Preparation and characterization of microporous PVDF/PMMA composite membranes by phase inversion in water/DMSO solutions
作品名稱(其他語言)
著者Lin, Dar-jong; Chang, Chi-lin; Lee, Chih-kang; Cheng, Liao-ping
單位淡江大學化學工程與材料工程學系
出版者Kidlington: Pergamon
著錄名稱、卷期、頁數European Polymer Journal 42(10), pp.2407-2418
摘要PMMA/PVDF composite membranes were prepared by isothermal immersion–precipitation of dope solutions consisting of PMMA, PVDF, and DMSO into both harsh and soft nonsolvent baths. The effects of PMMA and DMSO contents on the membrane morphology, crystal structure, thermal behavior and tensile strength of the formed membrane were investigated. For a PMMA-free casting dope immersed in a harsh bath, such as pure water, the formed membrane exhibited a typical asymmetric morphology characterized by skin, finger-like macrovoids, and cellular pores. In contrast, when a soft 70% DMSO bath was adopted, PVDF crystallized to form a membrane packed by spherulitic globules. Incorporation of PMMA gave rise to interesting morphological features; e.g., PVDF globules were observed to adhere to the interlocked polymer branches coexisting with the continuous porous channels, as revealed by high resolution FESEM imaging. XPS analysis of the surfaces of the composite membranes suggested the occurrence of a surface segregation phenomenon, wherein PVDF preferentially migrated to the top surface region of the membrane such as to minimize the interfacial energy. XRD analyses indicated that PVDF crystallized into ‘α’ structure in both PVDF and PMMA/PVDF composite membranes. The crystallinity of the membranes was found to decrease with increasing PMMA content, which was confirmed by DSC thermal analyses. The latter results also indicated a significant decrease in membrane’s melting temperature as the PMMA content was increased. Tensile strengths of the membranes were improved by inclusion of PMMA in either harsh or soft baths. However, elongation at break showed a reversed trend.
關鍵字Poly(vinylidene fluoride); Poly(methyl methacrylate); Membrane; Morphology; Crystallization
語言英文
ISSN0014-3057
期刊性質國外
收錄於SCI;EI
產學合作
通訊作者
審稿制度
國別英國
公開徵稿
出版型式紙本
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