کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9684765 | 1456212 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Methanol permeability and proton conductivity of sulfonated co-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
Two types of sulfonated co-polyimides (co-SPIs) with ion exchange capacities of 1.83-2.32Â meq/g were prepared from 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA), two types of sulfonated diamines, namely, 4,4â²-bis(4-sulfophenoxy)biphenyl-3,3â²-disulfonic acid (BAPBDS) and bis(3-sulfopropoxy)benzidines (BSPBs), and common non-sulfonated diamines via statistical polycondensation reaction. The BSPB-based co-SPI membranes had a clear microphase-separated structure composed of hydrophilic and hydrophobic domains but the connection of hydrophilic domains was rather poor. On the other hand, the BAPBDS-based co-SPI membranes did not show such a clear microphase separation. The co-SPI membranes except for a few ones showed high proton conductivities of 0.10-0.16Â S/cm in water at 323Â K, which was comparable to that of Nafion 112 (0.13Â S/cm). The methanol permeabilities of the co-SPI membranes hardly depended on feed composition up to 50Â wt.% of methanol and were in the range of 0.5Â ÃÂ 10â6 to 1.8Â ÃÂ 10â6Â cm2/s at 323Â K, which were more than two times smaller than those of Nafion 112. As a result, the co-SPI membranes showed more than two times larger ratios of proton conductivity over methanol permeability than Nafion, suggesting high potential for direct methanol fuel cell application.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 258, Issues 1â2, 1 August 2005, Pages 115-122
Journal: Journal of Membrane Science - Volume 258, Issues 1â2, 1 August 2005, Pages 115-122
نویسندگان
Ken-ichi Okamoto, Yan Yin, Otoo Yamada, Md. Nurul Islam, Tatsuaki Honda, Takashi Mishima, Yoshiki Suto, Kazuhiro Tanaka, Hidetoshi Kita,