کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
627020 | 1455454 | 2009 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Membranes based on modified polyimides for gas and organic vapour separations
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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 non-porous, flat membranes were prepared from soluble polyimides based on 4,40-oxydi(phthalic anhydride) or 4,40-(hexafluoroisopropylidene)diphthalic anhydride and 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane. Poly(ethylene adipate) terminated with 4-methyl-1,3-phenylene diisocyanate with a controlled number average molecular weight 1300 or 2700 g molâ1 was used as a crosslinking agent (0-80 wt.%). The morphology of these materials was monitored by using dynamic mechanical analysis and scanning electron microscopy. All the materials were insoluble and showed no weight losses up to 240C. The permeability coefficient of methanol in the membranes with more than 50 wt.% of non-polyimides was 2-3 orders of magnitude higher than that of carbon dioxide. The different transport properties of pure hexane and cyclohexane from those of a hexane-cyclohexane mixture were found.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 236, Issues 1â3, 31 January 2009, Pages 46-50
Journal: Desalination - Volume 236, Issues 1â3, 31 January 2009, Pages 46-50
نویسندگان
P. Sysel, V. Sindelar, M. Kubonova, K. Friess, V. Hynek, M. Sipek,