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:Effect of the temperature of polyurethane dissolution on the mechanism of wet-casting membrane formation
學年91
學期2
出版(發表)日期2003/03/01
作品名稱Effect of the temperature of polyurethane dissolution on the mechanism of wet-casting membrane formation
作品名稱(其他語言)
著者Cheng, Liao-ping; Huang, Yen-shih; Young, Tai-horng
單位淡江大學化學工程與材料工程學系
出版者Elsevier
著錄名稱、卷期、頁數European polymer journal 39(3), pp.601-607
摘要An analysis of data from scanning electron microscopy (SEM), gel permeation chromatography (GPC) and differential scanning calorimetry (DSC) for two series of polyurethane membranes is presented. Membranes were prepared by direct immersion of the casting solution of polyurethane, dissolved in dimethyl formamide at different temperatures, into either water or 1-octanol bath at 25 °C. Depending on the temperature of polyurethane dissolution, a gradual variety in the membrane structure was observed by SEM. As the temperature of polymer dissolution was increased, the membrane structure changed from dense to cellular or particulate morphologies. On the basis of the GPC and DSC results, polyurethane molecular weight decreased but the degree of microphase separation caused by clustering of some of the soft and hard segments into separate domains in the membrane increased with increasing the temperature of polymer dissolution. It is thus proposed that the change in membrane structure is due to the variation of molecular weight of polyurethane, which in turn can change polymer chain mobility during membrane formation. In addition, the extent of microphase separation was described and related to the particulate morphology when 1-octanol was used as the nonsolvent.
關鍵字Polyurethane;Dissolution temperature;Particulate membranes
語言英文
ISSN0014-3057
期刊性質國外
收錄於
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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