Synergistic effects of hygrothermal conditions and solar ultraviolet radiation on the properties of structural particulate-filled epoxy polymer coatings

The synergistic effects of solar ultraviolet radiation, moisture, and in-service temperature on the properties of structural particulate-filled epoxy-based polymer coatings were investigated

Mojdeh Mehrinejad Khotbehsara; Allan Manalo; Thiru Aravinthan; Wahid Ferdous; Brahim Benmokrane; Kate T.Q. Nguyen

2021

Scholarcy highlights

  • The synergistic effects of solar ultraviolet radiation, moisture, and in-service temperature on the properties of structural particulate-filled epoxy-based polymer coatings were investigated
  • Surface microcracks after UV exposure that were wider with hygrothermal conditioning
  • Environmental conditioning enhanced the properties of coatings with at least 40% filler content
  • One of these sets was exposed to simulated UV conditions for 2000 hrs with the other set evaluated for the effect of HG conditioning
  • Physical observations showed yellowing on the surface of neat epoxy coating after HG or UV exposure, but the presence of fillers minimized fading and weight loss
  • The coatings contained up to 60% by volume of hydrated alumina powder and fly ash as fillers
  • ANOVA showed that the combination of HG and solar UV radiation negatively impacted the flexural properties of the coatings with up to 20% filler content but enhanced the coating properties with filler contents above 40%

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