Accelerated weathering test of HMS-PP
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2008
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FRENCH-BRAZILIAN MEETING ON POLYMERS, 2nd
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This method is meant to simulate the deterioration caused by sunlight and dew by means of artificial ultraviolet
light and condensation apparatus.
UV light is the prime cause of breakdown and produces effects which are similar to thermal degradation. These
involve the breaking of chemical bonds, giving rise to free radical which result in permanent chain scission in
this case to HMS-PP. Some of the groups formed may be chromophores. Unlike thermal degradation, UV
degradation does not occur uniformly throughout the polymer, but particularly with opaque materials, the effects
are felt on or near the surface.
The photo-oxidation, by the formation of free radicals, leads to molecule scissions by consequence, it has a large
influence on the physical and mechanical properties of HMS-PP.
This kind of ageing leads to an embrittlement of polymer materials. It causes a dramatic effect on the mechanical
properties and fracture behaviour. Polypropylene exposed to UV for long time, brutally passes from ductile
behaviour to a fragile behaviour.
The reduction of yield stress, tensile stress, elongation at break and viscosity were also observed.
Como referenciar
OLIANI, W.L.; PARRA, D.F.; LUGAO, A.B. Accelerated weathering test of HMS-PP. In: FRENCH-BRAZILIAN MEETING ON POLYMERS, 2nd, April 20-25, 2008, Florianopolis, SC. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/19274. 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.