Environmental degradation of epoxy-organoclay nanocomposites due to UV exposure: Part II residual mechanical properties

Ricky S.C. Woo, Honggang Zhu, Christopher K.Y. Leung, Jang Kyo Kim

Research output: Contribution to journalArticlepeer-review

93 Scopus citations

Abstract

The residual mechanical properties of epoxy-organoclay nanocomposites after moisture and UV exposure have been evaluated. The flexural modulus decreased after moisture saturation, with much less extent for the nanocomposite than the neat epoxy. The tensile failure strain was significantly reduced with UV exposure time due to the embrittlement effect, and the addition of organoclay mitigated the failure strain reduction. The elastic modulus varied little with UV exposure time regardless of organoclay, because the modulus was determined by the core material which was unaffected by UV exposure. The microhardness and the modulus of the surface material determined from nanoindentation tests increased after UV exposure, with less extent in the nanocomposite than the neat epoxy due to the thinner embrittled top layer for the nanocomposite. All these observations confirmed the beneficial effects of organoclay in improving the barrier characteristics against UV exposure.

Original languageBritish English
Pages (from-to)2149-2155
Number of pages7
JournalComposites Science and Technology
Volume68
Issue number9
DOIs
StatePublished - Jul 2008

Keywords

  • A. Epoxy/clay nanocomposite
  • A. Nano-structures
  • A. Polymer-matrix composites (PMCs)
  • B. Environmental degradation
  • D. Mechanical properties

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