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Interfacial Stress Transfer in Graphene Oxide Nanocomposites

Presented at SCI Members' Forum 2013 on 19 Nov 2013

Zheling Li, Robert J. Young and Ian A. Kinloch - University of Manchester

Abstract

Raman spectroscopy has been used for the first time to monitor interfacial stress transfer in poly(vinyl alcohol) (PVA) nanocomposites reinforced with graphene oxide(GO). The nanocomposites were prepared by a simple mixing method. It was found that GO was fully exfoliated and they tended align in the plane of films. It was shown that the Raman D band at ~1335 cm-1 downshifted as the nanocomposites were strained as a result of the interfacial stress transfer. With the knowledge of Grüneisen parameter, it was possible to estimate the effective Young’s modulus of GO from the Raman D band shift rate per strain to be the order of 120 GPa, similar to those from dynamic mechanical analysis. The lower effective modulus, compared with the accepted 200 GPa may be due to a combination of finite flake dimension, waviness and misalignment of GO flakes.

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