Abstract
Polymer based nanocomposites show great ability in enhancing both electrical and thermal properties, while the dispersion of nanofillers has always been a critical issue. Surface modification of nanoparticles can improve the compatibility between phases, which has been widely used in the fabrication of polymer nanocomposites. Herein, different kinds of surface modification methods are compared to study the role of tailoring surface chemistry of nano-SiO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> on its improvement in thermal properties of epoxy/nano-SiO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> composites. It is found that the glass transition temperature, thermal decomposition temperature and thermal conductivity of the nanocomposites with epoxy chain-grafted SiO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> are simultaneously improved in comparison with those of pure epoxy resin, nanocomposites with unmodified SiO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> and nanocomposites with silane coupling agent-modified SiO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> . The epoxy chains pre-grafted on the surface of nano-SiO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> not only have greater physical compatibility with epoxy matrix but provide the chemical groups which are able to react with epoxy resin to form cross-linked networks during the curing processes of thermosetting resins, improving the dispersion of nanofillers and therefore enhancing thermal properties. This surface modification approach can offer an organic–inorganic interfacial structure design paradigm for thermosetting resin-based composites exhibiting improved thermal performances.
Published Version
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