resumo
The incorporation of cork in synthetic polymers has become an effective approach to develop new sustainable materials. Cork-polypropylene composites (CPC) filled with three different cork granulometries were studied. Rheological analyses were performed to assess the processability of these CPC and a set of experiments was conducted keeping the same matrix/cork weight ratio, varying the cork granulometric distribution. The effect of three different cork granulometries, temperature and the effect of a coupling agent, polypropylene graft maleic anhydride (PPgMA), were analysed. All composites exhibited non-Newtonian, pseudoplastic behaviour. Related to neat PP, cork incorporation led to a viscosity increase. This increase is more significant in the CPC with the lowest powder cork granulometry used. On the other side, the addition of PPgMA resulted on a decrease of CPC viscosity. The experimental results were fitted to Cross-WLF Model through a viscosity master curve obtained by the time-temperature superposition principle (TTSP). This study showed that cork can be considered on the development of sustainable materials for injection moulding technology. (C) 2016 Elsevier Ltd. All rights reserved.
palavras-chave
MECHANICAL-PROPERTIES; MOLECULAR-WEIGHT; POLYPROPYLENE; FLOW
categoria
Engineering; Materials Science
autores
da Silva, SPM; Lima, PS; Oliveira, JM
nossos autores
J. Martinho Oliveira
Professor Coordenador
Sara Patrícia Magalhães da Silva
Investigador Júnioragradecimentos
The authors are grateful to COMPETE - Programa Operacional Factores de Competitividade (POFC), project number 30176, for financial support.