Citation: Rui Lei, Lian-xun Gao, Ri-zhe Jin, Xue-peng Qiu. Sulfonated Polyimides Containing 1,2,4-Triazole Groups for Proton Exchange Membranes[J]. Chinese Journal of Polymer Science, ;2014, 32(7): 941-952. doi: 10.1007/s10118-014-1460-7 shu

Sulfonated Polyimides Containing 1,2,4-Triazole Groups for Proton Exchange Membranes

1.
Shaanxi Coal and Chemical Technology Institute Co., Ltd., Xi'an 710065, China
2.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

Corresponding author: Lian-xun Gao,
Received Date: 8 November 2013
Revised Date: 11 December 2013

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 ℃. 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.
- Triazole,
- Acid-base interaction,
- Sulfonated polyimide,
- Proton exchange membrane
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沈阳化工大学材料科学与工程学院沈阳 110142