Estudos das propriedades mecânicas e térmicas do polímero biodegradável poli-3-hidroxibutirato (PHB) e de compósitos PHB/pó de madeira. / Study of mechanical and thermal properties of the biodegradable polymer poly-3-hydroxybutyrate (PHB) and PHB/wood flour composites.
AUTOR(ES)
Miriam Lúcia Chiquetto Machado
DATA DE PUBLICAÇÃO
2008
RESUMO
The purpose of this work was the study of the mechanical and thermal properties of processed, reprocessed and irradiated PHB, as well as PHB/wood flour composites. PHB/wood flour composites were prepared with PHB/wood relation of 90/10, 80/20 e 70/30 (w/w). Mechanical properties, HDT, Vicat melting point and thermo analyses (TGA and DSC) tests were carried out. The introduction of the wood flour increased both polymer crystallinity and crystallization temperature. The material stiffness increased in PHB/wood flour composites (80/20 and 70/30) resulting in higher values in some properties when compared with pure PHB. The PHB/wood flour composite 70/30 showed the best results in terms of economy, processing and stability during reprocessing. The irradiation after processing in 30kGy doses led to a stiffness increasing of pure PHB and PHB/wood flour composites (90/10 and 80/20) while other properties have decreased. The PHB/wood flour 70/30 showed decreasing in all properties after irradiation.
ASSUNTO(S)
materials irradiation poli-3-hidroxibutirato propriedades térmicas materials processing mechanical properties propriedades mecânicas irradiação de materiais thermal properties poly-3-hydroxybutyrate processamento de materiais
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