Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 105, Issue -, Pages 97-107Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2017.11.012
Keywords
Carbon nanotubes and nanofibers; Polymer-matrix composites (PMCs); Fracture toughness; Rheological properties
Funding
- China Scholarship Council
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The effects of incorporating MWCNT in a high-functionality epoxy resin system are reported. Oscillatory shear rheology showed as-received MWCNT (AR-MWCNT) to have a low degree of interaction with the resin and consequently G' values were low, whereas G' values for functionalized MWCNTs (amino and oxidised) were higher due to increased resin-nanotube interactions. Three approaches used to obtain rheological percolation thresholds showed values to increase in an order reflecting the improved MWCNT dispersion imparted by functionalisation. Analysis using colloidal dispersion theory fitted better with the experimental data than statistical percolation theory, and more closely mirrors the clustering of MWCNT agglomerates to form a percolated network. In fracture studies, toughness decreased with ARMWCNT addition whereas for functionalised MWCNT addition toughness increased. For AR-MWCNT nanocomposites large agglomerates were formed which reduced toughness. In contrast, functionalised MWCNTs exhibited pull-out and fracture and formed smaller agglomerates which toughened the matrix via crack-deflection and pinning. (C) 2017 Elsevier Ltd. All rights reserved.
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