Effects of solvents on post-irradiation grafting of styrene onto fluoropolymer films
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E-Polymers
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Due to the interest in the development of low cost membranes with
similar capabilities to Nafion®, grafting of styrene on fluorinated polymers by
simultaneous irradiation and pre-irradiation methods at high temperature (higher
than 50 °C) followed by sulfonation has been a process studied broadly. However,
there is very little information about grafting yield at room temperature after
simultaneous irradiation. Previous works reported that the surface morphology of
the styrene grafts has showed an uneven profile under the studied conditions. This
work aims to evaluate the grafting of styrene onto these films after simultaneous
irradiation (in post-irradiation condition), using different solvent in periods until 28
days at room temperature. Films of poly(tetrafluoroethylene) (PTFE) and
poly(vinylidene fluoride) (PVDF) were immersed in styrene/toluene 1:4 or
styrene/methanol 1:4 and then submitted to gamma radiation at 40 and 80 kGy
doses. The degree of grafting (DOG) was determined gravimetrically and physical
and chemical changes were evaluated by infrared spectroscopic analysis (FTIR),
differential scanning calorimeter analysis (DSC), thermogravimetric analysis (TGA),
and also by scanning electron microscopy (SEM). For PTFE films, the highest
DOG was achieved using toluene as solvent while for PVDF films, the highest
DOG was achieved with methanol. Surface images of the grafted films by SEM
technique have presented a strong effect of the solvents on the films morphology.
Finally, PVDF-g-PS in styrene/methanol film revealed higher DOG, although the
surface showed small cavities and discontinuities. On the contrary, the surface of
PTFE-g-PS in styrene/toluene presented homogeneous surface.
Como referenciar
GERALDES, ADRIANA N.; ZEN, HELOISA A.; PARRA, DUCLERC F.; FERREIRA, HENRIQUE P.; LUGAO, ADEMAR B. Effects of solvents on post-irradiation grafting of styrene onto fluoropolymer films. E-Polymers, v. 63, p. 1-12, 2008. DOI: 10.1515/epoly.2008.8.1.707. Disponível em: http://repositorio.ipen.br/handle/123456789/5076. 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.