Detailed dynamic mechanical analysis of thermomechanically stable melt‐processed PEK–MWCNT nanocomposites

Abstract

This article reports the detailed study of dynamic mechanical properties of multiwalled carbon nanotubes/poly(ether ketone) nanocomposites prepared by melt blending. The dynamic mechanical characterisitic parameters such as storage modulus (E′), loss modulus (E″) and damping factor (tan δ) were explored in detail to investigate the adhesion factor (A), strength factor (B), efficiency factor (C), and entanglement density (N). Adhesion factor, which is inversely related to the degree of interaction between nanotubes and matrix, decreased with increase in MWCNT loading. Strength factor (B) which is a direct measure of interaction between MWCNTs and PEK increased with increase in MWCNT loading. The effect of nanotubes on moduli of composites is calculated in terms of coefficient of reinforcement (C factor). Lower is the value of coefficient (C) higher will be the effectiveness of reinforcement on moduli of composites. It decreased from value of 1 at 1 wt% MWCNTs loading in PEK to 0.67 at 5 wt% MWCNTs loading which point towards increased effectiveness of MWCNTs at 5 wt% loading for excellent properties. To compliment these findings, entanglement density (N) was also calculated. Furthermore, Cole–Cole analysis was carried out to demonstrate the compatibility of both the components in composite system. POLYM. COMPOS., 39:2587–2596, 2018. © 2016 Society of Plastics Engineers

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