Estudo da influência dos procedimentos de síntese do óxido de grafeno e do processamento na obtenção de nanocompósitos de polipropileno
Tipo
Dissertação
Data de publicação
2019-08-12
Periódico
Citações (Scopus)
Autores
Oliveira, Yuri Durighetto Coelho de
Orientador
Andrade, Ricardo Jorge Espanhol
Título da Revista
ISSN da Revista
Título de Volume
Membros da banca
Domingues, Sergio Humberto
Carastan, Danilo Justino
Carastan, Danilo Justino
Programa
Engenharia de Materiais e Nanotecnologia
Resumo
In this work, polypropylene polymer-based nanocomposites with graphene-multilayer
oxide, obtained by different synthesis proceedings and processing techniques, were
studied. The first variation was in the synthesis method of graphene oxide
nanostructures. The second variation was in the methods of processing the
nanocomposites. These variations in processing techniques were designed to investigate
the best combination of mGO nanostructure with processing method to promote a better
physical affinity between a matrix of PP and GO. It was verified that the technique of
synthesis of mGO denominated P, presented material with a greater degree of
oxidation, about 5% more than the material L. After analysis of AFM the
nanostructures of GO were then classified as graphite oxide multilayer (mGO) for
presenting between 6 and 11 layers. In general, the PP/mGO nanocomposites presented
improvements in the thermal stability properties of the material up to 60 ° C difference
and increase in the crystallization temperature of the nanocomposites, indicating that
mGO acts as a nucleating agent. A lubricating effect of mGO nanostructures was
observed on the viscosity of the PP/mGO nanocomposites with 2% by mass mGO,
where viscosity drops dramatically when compared to pure polypropylene. For the
mGO-L nanocomposites, an increase in modulus of elasticity of up to 11% was
observed when compared to pure polypropylene. When subjected to accelerate aging,
nanocomposites presented higher thermal stability and lower photodegradation effect,
an improvement in UV radiation resistance about 3X when compared to pure
polypropylene. This is because mGO nanostructures block the passage of incident UV
radiation (screen effect), reducing the direct effect on polypropylene.
Descrição
Palavras-chave
nanocompósito PP/mGO , processamento , óxido de grafeno , polipropileno , fotodegradação
Assuntos Scopus
Citação
OLIVEIRA, Yuri Durighetto Coelho de. Estudo da influência dos procedimentos de síntese do óxido de grafeno e do processamento na obtenção de nanocompósitos de polipropileno. 2019. 116 f. Dissertação (Mestrado em Engenharia de Materiais e Nanotecnologia) - Universidade Presbiteriana Mackenzie, São Paulo, 2019.