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Influence of filler size on the properties of poly(lactic acid) (PLA)/graphene nanoplatelet (GNP) nanocomposites.
- Source :
-
European Polymer Journal . Jan2017, Vol. 86, p117-131. 15p. - Publication Year :
- 2017
-
Abstract
- Poly(lactic acid) (PLA) composites reinforced with two types of graphite nanoplatelets varying in lateral size - small (GNP-S) and large (GNP-L) - were produced via melt compounding. Morphological, thermal, mechanical, and electrical properties were investigated to reveal the influence of particle size. Electron microscopy and X-ray diffraction showed well dispersed small GNP-S particles up to 10 wt.% loading, while large GNP-L particles started to agglomerate at loadings ⩾7 wt.%. Addition of GNPs improved the Young’s modulus of the composites by 10% and 24% for small and large nanoplatelets, respectively, the latter being among the highest reported for PLA/GNP systems. For GNP-L this larger increase could be partly explained by an increase in crystallinity while no such effect was observed for GNP-S. Conversely, GNP-L systems showed embrittlement while polymer yield was preserved for GNP-S. GNP-L resulted in a lower electrical percolation threshold. However, systems based on smaller GNP-S particles showed significantly enhanced conductivity and a reduction in percolation threshold after annealing. Heat distortion temperature (HDT) increased by up to 13 °C, with large GNP-L showing the slightly larger increase. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00143057
- Volume :
- 86
- Database :
- Academic Search Index
- Journal :
- European Polymer Journal
- Publication Type :
- Academic Journal
- Accession number :
- 120410816
- Full Text :
- https://doi.org/10.1016/j.eurpolymj.2016.10.045