Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7889784 | Composites Part A: Applied Science and Manufacturing | 2018 | 11 Pages |
Abstract
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 Gâ² values were low, whereas Gâ² 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 AR-MWCNT 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.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Yan Liu, Arthur Wilkinson,