کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9684595 | 1456204 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Preparation and characterization of PVDF-HFP microporous flat membranes by supercritical CO2 induced phase separation
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Microporous poly(vinylidene fluoride-co-hexafluoropropylene) membranes were prepared by phase separation with supercritical CO2 as non-solvent. The dry flat membranes were directly obtained after CO2 pressure was diminished without post-treatment. Effects of experimental conditions such as the CO2 pressure, the polymer concentration and the temperature on the membrane porosity and average pore size were investigated. It was found that these membranes have a “sponge-like” and asymmetric structure. The average pore size increases with increasing CO2 pressure and temperature, but decreases with increasing polymer concentration. The porosity can reach approximately 88% and the average pore size was 5 μm or so. The crystallinity and thermal stability of membranes were characterized by wide-angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The results showed that the membranes are α crystals with excellent thermal stability.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 266, Issues 1â2, 1 December 2005, Pages 102-109
Journal: Journal of Membrane Science - Volume 266, Issues 1â2, 1 December 2005, Pages 102-109
نویسندگان
Jian-Hua Cao, Bao-Ku Zhu, Geng-Liang Ji, You-Yi Xu,