Title: Epoxy/zinc oxide + cerium oxide nanocomposites: effect of UV-exposure on the mechanical properties and appearance

Authors: S.N. Pencheva; D.B. Penchev; B.D. Penchev

Addresses: Faculty of Technology and Built Environment Unitec Institute of Technology, Carrington Road, Mt. Albert, Auckland, New Zealand ' National Institute of Creative Arts and Industries, University of Auckland, New Zealand ' Faculty of Social and Health Sciences, Unitec Institute of Technology, Carrington Road, Mt. Albert, Auckland, New Zealand

Abstract: UV radiation is known to deteriorate the tensile strength of epoxy based nanocomposites over time. In this study two nanopowders: ceria (CeO₂) and zink oxide (ZnO) were used in different proportions in attempt to identify the ratio which is most successful at maintaining the initial performance of the nanocomposite. All samples were subjected to varying durations of UV radiation and the change of their colour was noted. The results show the best synergetic effect of the CeO₂ and ZnO to be in the proportion of 1 : 4. Although CeO₂/ZnO fine additives in other applications are reported as possessing high transparency in visible region, it seems to be different in the current application. Dramatic change in colour is observed under UV treatment.

Keywords: cerium oxide nanocomposites; ceria; CeO2; zinc oxide; ZnO; rare earth; UV shielding; UV protection; epoxy; UV exposure; ultraviolet exposure; nanotechnology; UV radiation; tensile strength.

DOI: 10.1504/IJNT.2014.060577

International Journal of Nanotechnology, 2014 Vol.11 No.5/6/7/8, pp.555 - 562

Published online: 15 Dec 2014 *

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