کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
626891 | 1455456 | 2008 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of physical aging on sorption and permeation of small molecules in polyimide membranes
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The gas transport properties of Polyimide membranes were examined as a function of physical aging time. A clear decrease of the gas permeability coefficient was observed. Interpretation of the permeation properties using results from differential scanning calorimeter and dynamic mechanical analyzer indicated that the smaller segmental motion of the polymer chains would be more restrict with aging time. Physical aging reduced the measured solubility coefficients and calculated diffusivity coefficients. Furthermore, the effect of physical aging on selectivity coefficients of polymeric membrane was controlled by the change of diffusivity selectivity. A modified three parameter fit model is obtained and predicts the long-term physical aging behavior with good agreement with experiments
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 234, Issues 1â3, 31 December 2008, Pages 58-65
Journal: Desalination - Volume 234, Issues 1â3, 31 December 2008, Pages 58-65
نویسندگان
Ywu-Jang Fu, Sheng-Wen Hsiao, Chien-Chieh Hu, Hsuan-zhi Qui, Kueir-Rarn Lee, Juin-Yih Lai,