Desenvolvimento de membranas mistas a base de poli(indeno) sulfonado e PVA reticulado com objetivo de aplicação em célula a combustível tipo PEM
AUTOR(ES)
Neiva Löser
FONTE
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia
DATA DE PUBLICAÇÃO
2011
RESUMO
The study on alternative membranes for use in fuel cells PEM (Proton Exchange Membrane) has been conducted by different research groups worldwide. As the commercial membranes still have high cost and performance limitations in certain operating conditions of fuel cells powered by hydrogen and alcohol. This study aimed to evaluate non-fluorinated membranes prepared from poly(indene) and sulfonated poly(vinyl alcohol) (PVA) to form semi-interpenetrating polymer network (semi-IPN), the PVA crosslinked with different crosslinking agents (AR). The compositions of the membranes were 80:20, 70:30 and 60:40 for SPInd and PVA, respectively, containing 2.5, 5.0 or 7.5% of glutaraldehyde (GLU) or sulfosuccinic acid (SSA) as crosslinking agent. Polymers and membranes were evaluated by infrared spectroscopy (FT-IR), thermogravimetry analysis (TGA). They were also characterized regarding the content of sulfonic groups (GS), ion exchange capacity (IEC) and water uptake, electrochemical impedance spectroscopy (EIS), and dynamic mechanical analysis (DMA) and oxidative induction time (OIT) adapted method. The ion exchange capacity of membranes SPInd/PVA-AR varied in the range from 1.86 to 2.87 meq g-1 which is substantially higher for conductive membranes. The analysis showed that the membranes were homogeneous and have an excellent heat resistance and high degree of sulfonation (DS). The conductivity values of the membranes at room temperature were the order of 10-6 S.cm-1, however higher mechanical strength and lower water uptake must be pursued for PEM fuel cells applications.
ASSUNTO(S)
membranas (tecnologia) combustíveis polímeros
ACESSO AO ARTIGO
http://hdl.handle.net/10183/34684Documentos Relacionados
- Preparação e caracterização de polieletrólitos para célula a combustível baseados em poli(indeno) e álcool polivinílico
- Obtenção de polieletrólitos a partir de copolímero estireno-indeno para aplicação em célula a combustível tipo PEM
- Membranas de PVA e sílica para aplicação em célula a combustível de alimentação direta de álcool
- Produção de membranas híbridas zirconizadas de SPEEK/Copolissilsesquioxano para aplicação em células a combustível do tipo PEM
- Membranas híbridas com potencial uso em células a combustível - parte 2: nanocompósitos de poli(carbonato) sulfonado