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Advanced Materials

A Molecular Mechanism for Toughening and Strengthening Waterborne Nanocomposites

Authors


  • T.W. acknowledges an Overseas Research Student Scholarship from Universities UK and a University Research Scholarship from the University of Surrey. D.L. acknowledges funding from a Kwan Trust Scholarship from the University of Surrey. Supporting Information is available online from Wiley InterScience or from the authors.

Abstract

A high molecular-weight polymer – not a small molecule or surfactant – is superior for dispersing carbon nanotubes in water when processing a waterborne, polymeric nanocomposite. A polymeric dispersant above its entanglement molecular weight creates a brush structure on the nanotube that increases molecular friction on entangles with the matrix, yielding increased adhesion energy, as shown, along with greater toughness and energy dissipation during deformation. A dispersant can thereby be used to tune a nanocomposite's mechanical properties.

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