Evaluation of the degradation effect on the processability of high molecular weight polypropylene
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2007
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INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE; MEETING ON NUCLEAR APPLICATIONS, 8th/ MEETING ON REACTOR PHYSICS AND THERMAL HYDRAULICS, 15th
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One way to improve the processability of high molecular weight and melt strength of Polypropylene (PP) is
reducing its molecular weight by chain scission with increase of flow index. Nevertheless, the more significant
occurrence of chain scission in its structure, further improved its processability is at expense of physical
properties. It is well known that the high energy radiation creates free radicals in the polymer chains that
subsequently stabilize forming structures. These structures composed by low molecular weight chains and by
grafted, branched and crosslinked chains modify the physical and chemical properties of the polymer, depending
of their distribution. The low molecular weight chains become from the degradation process by high energy
irradiation, which decreases the melt strength and improves its processability. So, this work has the objective to
evaluate the degradation of the high molecular weight PP using different irradiation doses. Two kinds of PP
samples were utilized. The first one, without additive, presented a flow index of 1.9 g/10 min, and the second,
additivated with 0.2 wt % of antioxidant phenolic, Irganox 1010, with a flow index of 0.9 g/10 min. These
samples were irradiated with doses of 12.5 and 20.0 kGy. The results of flow index and melt strength obtained
with these two kinds of samples showed the antioxidant and the radiation action.
Como referenciar
SHINZATO, RODRIGO; OTAGURO, HARUMI; LIMA, LUIS F.C.P.; PARRA, DUCLERC F.; ARTEL, BEATRIZ W.H.; LUGAO, ADEMAR B. Evaluation of the degradation effect on the processability of high molecular weight polypropylene. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE; MEETING ON NUCLEAR APPLICATIONS, 8th/ MEETING ON REACTOR PHYSICS AND THERMAL HYDRAULICS, 15th, Sept. 30 - Oct. 5, 2007, Santos, SP. Proceedings... Disponível em: http://repositorio.ipen.br/handle/123456789/17593. 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.