Study of high melt strength polypropylene (HMS-PP) under thermal ageing
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2008
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PROCEEDINGS OF THE POLYMER PROCESSING SOCIETY, 24th
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The irradiation of PP to obtain HMS-PP allows introducing energy into the material to generate favorable changes,
when used in adequate doses. On the other hand, the stability to ageing of HMS-PP obtained by radiation process have
not been evaluated until yet.
In this study HMS-PP was obtained by the irradiation in atmosphere of acetylene as crosslinker agent. It was employed
doses of 12.5 kGy and 20 kGy of gamma radiation. Thermal treatment was used as a post irradiation in order to permit
the annihilation of the remaining radicals. The thermal stability of the HMS-PP was evaluated in stove at temperature of
90 °C, in presence of air at different periods of time.
Physical and Mechanical properties were monitored during the ageing by the techniques of Tensile Mechanical Test,
Thermogravimetry (TGA), Differential Calorimetry (DSC), Scanning Electronic Microscopy (SEM) and Optical
Microscopy (MO).
Oxidative degradation on the network of HMS-PP, formed in the radiation process of PP, was revealed by the analytical
results showing the susceptibility of HMS-PP to thermal oxidative degradation. Yellowing of the samples surface, loss
of mechanical property of tension strength, oxidative products of degradation among other evidences were observed.
In thermo-oxidative conditions, the formation of the oxidation products essentially involves a hydrogen abstraction by
the peroxy radicals, leading to hydroperoxides as primary products, chemical degradation in the immediate crack tips.
Como referenciar
OLIANI, W.L.; PARRA, D.F.; OTAGURO, H.; LUGAO, A.B. Study of high melt strength polypropylene (HMS-PP) under thermal ageing. In: PROCEEDINGS OF THE POLYMER PROCESSING SOCIETY, 24th, June 15-19, 2008, Salerno, Italy. Proceedings... Disponível em: http://repositorio.ipen.br/handle/123456789/15954. 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.