Thermal behaviour of polypropylene membranes modified by radiation-induced grafting polymerization
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2008
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INTERNATIONAL CONGRESS ON THERMAL ANALYSIS AND CALORIMETRY, 14th; BRAZILIAN CONGRESS ON THERMAL ANALYSIS AND CALORIMETRY, 6th
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The thermal behaviour of polypropylene (PP) films modified by radiation-induced grafting of styrene onto PP
using the simultaneous irradiation process was studied. The grafted membranes are applied as proton
exchange membranes in fuel cell technology. Consequently, it is important to verify their thermal stability. The
films were immersed in solution of styrene/toluene at the proportion 4:1. Nitrogen was bubbled to guarantee
inert atmosphere. The samples were exposed to gamma irradiation at 40, 80 and 100 kGy doses, at room
temperature. After graft reaction the films were kept at room temperature and inert atmosphere for periods of 7,
14, 21 and 28 days in order to evaluate the degree of grafting (DOG). At the end of grafting process the films
were sulfonated to provide the hydrophilic property. The DOG was determinated gravimetrically and the
chemical changes in the grafted and sulfonated membranes were characterized by Fourier transform infrared
spectroscopy (FTIR), Thermogravimetric measurement (TG), Differential Scanning Calorimeter (DSC). For the
sulfonated samples the Ion Exchange Capacity was calculated. The greatest DOG was achieved after 21 days
of post-irradiation. By TG the grafted films exhibited a decrease in the thermal stability, while the sulfonated
ones exhibited an increase in the property. The DSC allowed verifies that the PP matrix didn’t suffer drastic
change in the melting temperature after grafting and sulfonation reactions. The IEC calculated shows that the
new membrane has ionic conductivity property.
Como referenciar
ZEN, HELOISA A.; GERALDES, ADRIANA N.; PARRA, DUCLERC F.; LUGAO, ADEMAR B. Thermal behaviour of polypropylene membranes modified by radiation-induced grafting polymerization. In: INTERNATIONAL CONGRESS ON THERMAL ANALYSIS AND CALORIMETRY, 14th; BRAZILIAN CONGRESS ON THERMAL ANALYSIS AND CALORIMETRY, 6th, September 14-18, 2008, Sao Pedro, SP. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/19229. 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.