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Viscoelastic properties and physical gelation of poly (butylene adipate-co-terephthalate)/graphene nanoplatelet nanocomposites at elevated temperatures
journal contribution
posted on 2016-09-01, 00:00 authored by Sima Kashi, R K Gupta, N Kao, S N BhattacharyaA series of biodegradable nanocomposites were prepared by dispersing graphene nanoplatelets (GNPs) in poly (butylene adipate-co-terephthalate) (PBAT). Variations of dynamic and steady shear rheology of the nanocomposites with GNP loading and temperature were investigated via oscillatory measurements. Viscoelastic properties of the matrix exhibited significant enhancement with GNP addition. Solid-like flow behaviour was observed for highly filled samples while pure PBAT and nanocomposites with low GNP loadings showed liquid-like behaviour. Interestingly, the liquid-solid transition was found to occur at lower GNP concentrations with increasing temperature; dropping from 11.5 wt% at 160 °C to 7 wt% at 220 °C. Furthermore, in contrast to ideal melts, viscoelastic properties of some of the nanocomposites increased with increasing temperature. These observations suggest that the percolation did not originate only from network formation between the platelets but may be related to a combined GNP-PBAT gelling network, which enhanced with increasing temperature, leading to a more solid-like response at elevated temperatures. Variation of shear viscosity of nanocomposites with temperature also showed that increasing GNP loading reduces the temperature sensitivity of viscosity, leading to an increase in relative viscosity of nanocomposites with increasing temperature.
History
Journal
PolymerVolume
101Pagination
347 - 357Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0032-3861Language
engPublication classification
C1 Refereed article in a scholarly journalUsage metrics
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No categories selectedKeywords
Science & TechnologyPhysical SciencesPolymer ScienceGraphene nanoplateletRheologyNanocompositeTemperaturePercolation thresholdRHEOLOGICAL BEHAVIORMELT RHEOLOGYPOLY(BUTYLENE ADIPATE-CO-TEREPHTHALATE)POLYPROPYLENE NANOCOMPOSITESNANOGRAPHITE PLATELETSBIOPOLYMER COMPOSITESGRAPHENE NANOSHEETSTHERMAL-PROPERTIESEXPANDED GRAPHITECARBON NANOTUBES
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