4.5 Article

Sulfonated polyimides containing 1,2,4-triazole groups for proton exchange membranes

Journal

CHINESE JOURNAL OF POLYMER SCIENCE
Volume 32, Issue 7, Pages 941-952

Publisher

SPRINGER
DOI: 10.1007/s10118-014-1460-7

Keywords

Triazole; Acid-base interaction; Sulfonated polyimide; Proton exchange membrane

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A series of sulfonated polyimide copolymers as novel proton exchange materials were synthesized by the polycondensation of 1,4,5,8-naphthalene-tetracarboxylic dianhydride (NTDA), sulfonated diamine based on pyridine group and diamine containing N-phenyl-1,2,4-triazole moiety. Flexible, transparent and tough membranes with high thermal stability and good mechanical properties were obtained. They exhibited good stability in boiling water and Fenton's reagent at 80 A degrees C. More interestingly, a nonlinear relationship between proton conductivities of the resulting membranes and the degree of sulfonation (DS) was observed. The membrane with 50% DS exhibited the maximum proton conductivity, which was due to the combinational contributions of sulfonic acid and N-pheny-1,2,4-triazole groups. Thus, the N-phenyl-1,2,4-triazole moiety in this study not only can depress water absorption but also increase proton conductivity, especially at low DS.

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