کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9684978 | 1456219 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Gas separation properties of carbon molecular sieve membranes derived from polyimide/polyvinylpyrrolidone blends: effect of the molecular weight of polyvinylpyrrolidone
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Gas separation properties of carbon molecular sieve membranes derived from polyimide/polyvinylpyrrolidone blends: effect of the molecular weight of polyvinylpyrrolidone Gas separation properties of carbon molecular sieve membranes derived from polyimide/polyvinylpyrrolidone blends: effect of the molecular weight of polyvinylpyrrolidone](/preview/png/9684978.png)
چکیده انگلیسی
Carbon molecular sieve (CMS) membranes were prepared using aromatic polyimide (PI) and polyvinylpyrrolidone (PVP) polymer blends. The characteristics of the carbon structures and the gas permeation properties of the CMS membranes pyrolyzed at 500 and 700 °C were investigated in terms of the molecular weight of PVP (the thermally labile polymer). The PI/PVP blend showed two separate thermal decomposition steps. In an argon atmosphere, PVP underwent complete decomposition first at 350-450 °C, while the thermal degradation of PI occurred at 550-650 °C. The nitrogen adsorption isotherm of the CMS membranes showed that the thermal decomposition of PVP significantly affected the average pore volume of the resultant CMS membranes, and that it depended upon the molecular weight of PVP. CMS membranes with a higher molecular weight of PVP pyrolyzed at 550 °C exhibited an enhanced O2 gas permeability from 4200.28 Ã 10â18 to 6075.405 Ã 10â18 m2 sâ1 Paâ1 (560 to 810 barrers) and a reduced O2/N2 selectivity of 10-7.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 251, Issues 1â2, 1 April 2005, Pages 159-167
Journal: Journal of Membrane Science - Volume 251, Issues 1â2, 1 April 2005, Pages 159-167
نویسندگان
Youn Kook Kim, Ho Bum Park, Young Moo Lee,