(180k) Novel Fluorinated Poly(aryl ether oxadiazole)s with Allyl Ammonium Groups for Anion Exchange Membranes

Novel fluorinated poly(aryl ether oxadiazole)s with allyl
ammonium groups for anion exchange membranes

Li Cunpu, Xiaofeng XIE *, Changsheng Deng

Institute of Nuclear and New Energy
Technology, Tsinghua University, Beijing 100084, China

Abstract:

The worldwide energy crisis intensifies, and more people pay their
attention to the field of new energy technology. Batteries, as an important
branch of the new energy technology, have been brought out frequently. With
technology being evolved steadily, ion exchange membrane has been widely
applied in the batteries. Indeed, it has become a core component of Direct
Methanol Fuel Cell(DMFC), and so on.

       For
a long time, the membrane which has been applied in the battery field, is
basically Proton Exchange Membrane (PEM) that it also largely driven the
development of the battery industry, but its limitations are increasingly
exposed. Scientific research and manufacture progress require new types of ion
exchange membrane. Compared to PEM, anion exchange membrane technology is not
mature. In this context, researchers has been exploring and developing novel
anion exchange membranes.

In this work, a novel fluorinated poly(aryl ether oxadiazole)s
ionomer with diallyl
ammonium groups (FPAEO-DA-x) were synthesized via copolymerization of 2,5-bis(2,3,4,5,6-pentafluorophenyl)-
1,3,4-oxadiazole (FPOx) and diallyl
bisphenol A (DABPA) bromination
of the allyl and imidazolidation
with N£methylimidazole (NMI). The anion exchange
membranes were obtained by solution casting method and followed by hydroxide
exchanging in sodium hydroxide solution. The chemical structures and properties
of the FPAEO-DA-x membranes were studied. The highest ionic conductivity of the
FPAEO-DA-2 membrane was achieved at 2.12°Á10^-2 S cm^-1 in
deionized water at 80 °æ. The swelling ratio and TGA
properties of the FPAEO-DA-x membranes revealed their good mechanical and
thermal stability. Moreover, the FPAEO-DA-x membranes showed excellent
solubility in low boiling point water-soluble solvents such as methanol, which
would be helpful for membrane electrode assembly preparation. The FPAEO-DA-x
membranes showed great potential for alkaline electrolyte membrane fuel cells
(AEMFCs) applications

Scheme 1. Synthesis
of FPAEO-DA-x membranes

Keywords£ºAnion Exchange Membrane; Polymere; Alkaline Direct Methanol Fuel Cells

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