Rheological behaviour of cork-polymer composites for injection moulding
authors da Silva, SPM; Lima, PS; Oliveira, JM
nationality International
journal COMPOSITES PART B-ENGINEERING
author keywords Polymer-matrix composites (PMCs); Thermoplastic resin; Rheological properties; Injection moulding
keywords MECHANICAL-PROPERTIES; MOLECULAR-WEIGHT; POLYPROPYLENE; FLOW
abstract 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.
publisher ELSEVIER SCI LTD
issn 1359-8368
year published 2016
volume 90
beginning page 172
ending page 178
digital object identifier (doi) 10.1016/j.compositesb.2015.12.015
web of science category Engineering, Multidisciplinary; Materials Science, Composites
subject category Engineering; Materials Science
unique article identifier WOS:000372559900018
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journal impact factor 4.920
5 year journal impact factor 4.858
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