کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1291369 | 973356 | 2007 | 4 صفحه PDF | دانلود رایگان |
A new and facile approach has been developed for the preparation of cross-linked sulfonated poly(sulfide sulfone) (SPSSF) membranes. The cross-linking reaction was performed by immersing the SPSSF membranes into polyphosphoric acid at 180 °C for 1.5 h and the cross-linking bond was the very stable sulfonyl group. Cross-linking significantly improved the membrane performance, i.e., the cross-linked membranes showed better mechanical properties, lower water uptake and lower methanol permeability than the corresponding uncross-linked ones, while reasonably high proton conductivity was maintained. For example, for the membrane containing 40 mol% sulfonated moiety, by cross-linking the tensile strength increased from 39 MPa (dry) or 21 MPa (wet) to 44 MPa (dry) or 30 MPa (wet) and the elongation at break from 17% (dry) or 18% (wet) to 65% (dry) or 21% (wet), while the water uptake was reduced from 74 to 38 wt% and the methanol permeability from 7.0 × 10−7 to 1.6 × 10−7 cm2 s−1 (30 °C). The proton conductivity, however, did not decrease too much (from 0.076 to 0.043 S cm−1 in water at 30 °C).
Journal: Journal of Power Sources - Volume 170, Issue 1, 30 June 2007, Pages 42–45