Chem. J. Chinese Universities ›› 2020, Vol. 41 ›› Issue (2): 365.doi: 10.7503/cjcu20190361

• Polymer Chemistry • Previous Articles    

Synthesis and Properties of Highly Branched Comb-shaped Poly(aryl ether sulfone)s/imidazolium-functionalized Graphene Oxide Anion Exchange Composite Membranes

FANG Mingliang,LIU Dong,HU Meishao,WANG Lei()   

  1. School of Materials Science and Engineering, Shenzhen University, Shenzhen Key Laboratory of Polymer Materials & Manufacturing Technology, Shenzhen 518060, China
  • Received:2019-06-27 Online:2020-02-10 Published:2019-12-23
  • Contact: Lei WANG E-mail:wl@szu.edu.cn
  • Supported by:
    ? Supported by the National Natural Science Foundation of China(51773118);the Natural Science Foundation of Guangdong Province, China(2018040);the Natural Science Foundation of Guangdong Province, China(2016003);Shenzhen Sci & Tech Research Grant(JCYJ20170302150014024);Shenzhen Sci & Tech Research Grant(JCYJ20170818093417096)

Abstract:

1-(6-Bromohexyl)-3-methylimidazolium bromide-functionalized graphene oxide(6BrIm-GO) was synthesized with hydroxylated graphene oxide(GO-OH) and 1-(6-bromohexyl)-3-methylimidazolium bromide(6BrIm)by the Williamson reaction. After introducing 6BrIm-GO into the matrix of highly branched comb-shaped poly(aryl ether sulfone)s(ImHBPES-8), a set of anion exchange nano-composite membranes(ImHBPES-8/x-6BrIm-GO) were prepared via physical blending, solution casting and ion exchange. 6BrIm-GO, which acted as a kind of unique functional nano-filler within membranes, provided more sites for hydroxide ion transport. It was the introduction of 6BrIm-GO to ImHBPES-8 that enhanced not only mechanical strength but also hydroxide conductivity for the ImHBPES-8 membrane. The structure-property relationships of the as-prepared membranes were investigated in detail by regulating the content of 6BrIm-GO. This results revealed that all of the ImHBPES-8/x-6BrIm-GO composite membranes showed better overall properties than the ImHBPES-8 membrane after introducing 6BrIm-GO into ImHBPES-8. Among of these membranes, the ImHBPES/0.75%-6BrIm-GO composite membrane exhibited the most outstanding features. Tensile strength of the membrane was 18.32 MPa, which was 22.9% higher than the ImHBPES-8 membrane. Hydroxide conductivity of the ImHBPES/0.75%-6BrIm-GO composite membrane in this work reached a maximum value of 79.8 mS/cm at 80 ℃. Moreover, this membrane remained approximately 70% of its initial hydroxide conductivity, which was far over the ImHBPES-8 membranes(56%), after immersing the membrane into a 1 mol/L aqueous KOH solution at 60 ℃ for 300 h, indicating that the ImHBPES/0.75%-6BrIm-GO composite membrane possessed an excellent alkaline resistance stability. In summary, these results suggested that the ImHBPES/0.75%-6BrIm-GO composite membrane with remarkable overall performance had a great potential in alkaline polyelectrolyte fuel cells.

Key words: Highly branched poly(aryl ether sulfone)s, Imidazolium, Functionalized graphene oxide, Blending, Anion exchange composite membrane

CLC Number: 

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