Sulfonation of polypropylene films for proton exchange membrane
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2008
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POLYMER PROCESSING SOCIETY ANNUAL MEETING, 24th
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Resumo
The sulfonation of polypropylene (PP) films was carried out after the styrene grafting
onto PP films by the simultaneous irradiation method. The experimental part comprises
PP films with 40µm thickness immersed in styrene/toluene (4:1, v/v) solution at room
temperature and nitrogen atmosphere with exposition to gamma ionizing radiation. The
irradiation doses used were 20, 40, 80 and 100 kGy. After irradiation process the samples
were kept in the nitrogen, at room temperature at periods of 7, 14 and 21 days in order to
observe the behavior of grafting yielding. In the sequence the grafting films were
sulfonated using chlorosulfonic acid at room temperature for 15 minutes. Chemical and
structural changes of the sulfonated PP films were characterized by infrared
spectroscopic analysis (FTIR), differential scanning calorimetry analysis (DSC),
thermogravimetric analysis (TGA) and the ion exchange capacity (IEC) of membranes
which was determined by acid-base titration. Also the degree of grafting (DOG) was
determined gravimetrically. The DOG value is higher for the film submitted at 100 kGy.
The sulfonated films show a little decrease in the thermal stability when compared with
the pure polymer. The IEC of sulfonated PP membranes is 1.3 meq g-1 and the Nafion®
value is 0.9 meq g-1 (1).
Como referenciar
ZEN, H.A.; GERALDES, A.N.; FERREIRA, H.P.; PARRA, D.F.; LUGAO, A.B. Sulfonation of polypropylene films for proton exchange membrane. In: POLYMER PROCESSING SOCIETY ANNUAL MEETING, 24th, June 15-19, 2008, Salerno, Italia. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/19235. Acesso em: 30 Dec 2025.
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