کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
637686 883691 2008 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis and properties of poly(aryl ether benzimidazole) copolymers for high-temperature fuel cell membranes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Synthesis and properties of poly(aryl ether benzimidazole) copolymers for high-temperature fuel cell membranes
چکیده انگلیسی

A series of poly(aryl ether benzimidazole) copolymers bearing different aryl ether linkage contents were synthesized by condensation polymerization in polyphosphoric acid (PPA) by varying the feed ratio of 4,4′-dicarboxydiphenyl ether (DCPE) to terephthalic acid (TA). As the ether unit content in the copolymer increased, the solubility of the copolymer in PPA and N,N′-dimethylacetamide/LiCl improved. For example 3–7 wt.% DMAc solution containing 2 wt.% of LiCl could be prepared from the copolymers. XRD studies revealed that the incorporation of flexible aryl ether linkages increased the chain d-spacings of the polymer backbones and decreased the crystallinity of the copolymers. Still, these copolymers having ether linkages showed reasonably good thermal/mechanical stability and high proton conductivity. For example, the copolymer with 30 mol% ether linkage had a tensile strength of 43 MPa (at 26 °C and 40% relative humidity) at an acid doping level of 7.5 mol H3PO4 and a proton conductivity of 0.098 S cm−1 (at 180 °C and 0% relative humidity) at an acid doping level of 6.6 mol H3PO4.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 323, Issue 2, 15 October 2008, Pages 362–370
نویسندگان
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