Preparation and characterization of radiation-grafted poly(ethylene-co-tetrafluoroethylene) films as electrolyte for alkaline fuel cells
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2016
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BRAZILIAN MRS MEETING, 15th
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Resumo
Anion Exchange membranes (AEMs) are a promising alternative to the
development of more efficient electrolytes for alkaline fuel cells. In general, the
AEMs are ionomeric membranes able to conduct hydroxide ions (OH-) due to
quaternary ammonium exchange groups, which confer to AEM high pH
equivalent. The AEMs are based on crosslinked fluorinate/partially fluorinated
polymer due to their outstanding chemical and thermal stability compared to
hydrocarbon polymer-based matrix. The pre-irradiation method has been widely
used for grafting (copolymerization) of monomers into polymer matrix due to a
reduced formation of homopolymers and the possibility of grafting to be carried
out at any time. The radicals produced during radiation process decay as a
function of time and affect the grafting reaction, such as reduction of active
centers, grafting yield and membranes properties. In order to optimize the
irradiation parameters process and the membrane reproducibility, the stability of
radicals styrene-grafted ETFE prepared by using electron beam irradiation by
doses of 70 and 100 kGy as a function of storage time (up to 10 months) was
evaluated by electron paramagnetic resonance (EPR), degree of grafting, ion
exchange capacity (IEC), and electrochemical impedance spectroscopy. Results
have shown that the radicals formed could be preserved by storage at low
temperature (-70 °C), producing membranes with high homogeneity and
satisfactory ionic conductivity. Such results have demonstrated that ETFE-based
AEMs are promising electrolyte for alkaline fuel cell applications.
Como referenciar
PEREIRA, CLOTILDE C.; RODRIGUES JUNIOR, ORLANDO; SILVA, LEONARDO G. de A.; SANTIAGO, ELISABETE I. Preparation and characterization of radiation-grafted poly(ethylene-co-tetrafluoroethylene) films as electrolyte for alkaline fuel cells. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... São Carlos, SP: Aptor Software, 2016. p. 1583-1584. Disponível em: http://repositorio.ipen.br/handle/123456789/28070. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.