Protooxidation behaviour of HMS-PP
Carregando...
Data
Data de publicação:
2009
Orientador
Título da Revista
ISSN da Revista
Título do Volume
É parte de
É parte de
É parte de
É parte de
INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE; MEETING ON NUCLEAR APPLICATIONS, 9th; MEETING ON REACTOR PHYSICS AND THERMAL HYDRAULICS, 16th; MEETING ON NUCLEAR INDUSTRY, 1st
Exportar
Resumo
The radiation process has played an important role to produce polymers with controlled rheological properties.
The main scope of the study is to evaluate the stability of High melt strength polypropylene (HMS-PP) prepared
by gamma irradiation of PP (spheres) under acetylene atmosphere followed by a heating step to terminate
reactions, in different doses of 12.5 kGy and 20 kGy. The samples submitted to the natural ageing for a period
of one year were characterized by: thermogravimetry (TG), differential scanning calorimetry (DSC), infrared
spectroscopy (FTIR) and scanning electron microscopy (SEM). The fundamental process that is believed to be
the most significant in the mechanism of photooxidative degradation is the formation of hydroperoxides. The
high energy UV light is capable of initiating bond scission within the polymer backbone, which leads to further
chemical modification of the bonds via scissions and chain reactions through formation of radical species. The
results showed that in pristine and HMS-PP samples exposed to UV radiation, oxidation reactions occur,
resulting in chain scissions. The reactions occur preferentially in the amorphous phase owing to the higher
permeability of oxygen.
Como referenciar
OLIANI, WASHINGTON L.; PARRA, DUCLERC F.; LIMA, LUIS F.C.P.; LUGAO, ADEMAR B. Protooxidation behaviour of HMS-PP. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE; MEETING ON NUCLEAR APPLICATIONS, 9th; MEETING ON REACTOR PHYSICS AND THERMAL HYDRAULICS, 16th; MEETING ON NUCLEAR INDUSTRY, 1st, September 27 - October 2, 2009, Rio de Janeiro, RJ. Proceedings... Disponível em: http://repositorio.ipen.br/handle/123456789/11954. Acesso em: 19 Feb 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.
Assuntos
aging; calorimetry; cobalt 60; cracks; cross-linking; experimental data; gamma radiation; heating; infrared spectra; melting; polypropylene; radiation doses; radiation effects; scanning electron microscopy; stability; temperature dependence; tensile properties; thermal gravimetric analysis; time dependence; ultraviolet radiation