Journal of Northeastern University Natural Science ›› 2018, Vol. 39 ›› Issue (12): 1800-1804.DOI: 10.12068/j.issn.1005-3026.2018.12.025

• 化学 • Previous Articles    

Preparation and Investigation of PVDF Strengthened Imidazole Functionalized Poly(Aryl Ether Ketone) Membranes

YANG Jing-shuai, WANG Yi-han, ZHAN Si-fan, YANG Guo-hao   

  1. School of Sciences, Northeastern University, Shenyang 110819, China.
  • Received:2017-09-01 Revised:2017-09-01 Online:2018-12-15 Published:2018-12-19
  • Contact: YANG Jing-shuai
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Abstract: Novel polymer electrolyte membranes of thermostability with superior conductivity and improved dimensional stability have been proposed based on poly(vinylidene fluoride)(PVDF)blended with methylimidazolium poly(aryl ether ketone)(MeIm-PAEK). The relationship between the properties and chemical components of membranes has been investigated. 1H NMR spectra have confirmed the successful reaction of the imidazole function. Acid doping measurement indicates that grafting imidazole groups into PAEK makes the PAEK absorb phosphoric acid and the acid doping content increase with the increase of imidazole groups’ grafting degree. The dimensional stability of MeIm-PAEK membranes in the concentrated phosphoric acid solution under elevated temperatures can be improved by blending PVDF. The 70MeIm-PAEK/PVDF membrane achieves an acid doping content of 226% and volume swelling of 248% after being immersed in the 85% phosphoric acid solution. This acid doped membrane exhibits a conductivity as high as 0.141S/cm at 180℃ without humidifying.

Key words: polymer electrolyte membrane, fuel cell, thermo stability, conductivity, dimensional stability

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