This study assessed the fate of SiO2 nanoparticles (nanoSiO2) in epoxy/nanoSiO2 composites exposed to ultraviolet (UV) radiation. The matrix was a stoichiometric mixture of adiglycidyl ether of bisphenol A epoxy and an aliphatic tri-amine. Films of unfilled and 5 mass % SiO2-filled amine-cured epoxy were exposed to 75 % relative humidity (RH), 50 oC, and (290-400) nm UV radiation. Photodegradation, mass loss, surface morphology of the exposed composites, and composition of the released particles were characterized before and during exposure. Amine-cured epoxy/nanoSiO2 composites underwent rapid photodegradation, resulting in substantial mass loss, accumulation of SiO2 nanoparticles on the composite surface, and release of SiO2 nanoparticles. The results of this study will provide useful information to assess the potential risk of nanoSiO2 in epoxy nanocomposites during outdoor use.
Proceedings Title: Nanoparticle release during life cycle of nanocomposites and nano-containing materials
Conference Dates: June 21-25, 2010
Conference Location: Anaheim, CA
Conference Title: Nanotech2010
Pub Type: Conferences
epoxy, life cycle, nanocomposites, nanoparticles, release, UV. epoxy, life cycle, nanocomposites, nanoparticles, release, UV. Building technology, epoxy, life cycle, nanocomposites, nanoparticles, release, UV.