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A series of UV-protected coatings were prepared using cerium-oxide-functionalized oil fly ash ( f -OFA-CeO 2 ) in waterborne polyurethane (WBPU) dispersions. Three monomers, namely, poly(tetramethyleneoxide glycol) (PTMG), polydimethylsiloxane-hydroxy terminated (PDMS) and 4,4-dicyclohexylmethane diisocyanate (H 12 MDI), were used to pre-mix with f -OFA-CeO 2 separately, followed by the synthesis of WBPU/ f -OFA-CeO 2 dispersions. The f -OFA-CeO 2 distribution and enrichment into any part (top/bottom/bulk) of the coating was strongly affected by the pre-mixing of f -OFA-CeO 2 . The f -OFA-CeO 2 was densely distributed in the top, bottom and bulk when the f -OFA-CeO 2 was pre-mixed with PDMS, H 12 MDI and PTMG, respectively. Only an f -OFA-CeO 2 -enriched top surface showed excellent UV protection. The lowest UV-degraded exposed coating was found when the top surface of the coating was f -OFA-CeO 2 -enriched.

UV-Protected Polyurethane/f-Oil Fly Ash-CeO2 Coating: Effect of Pre-Mixing f-Oil Fly Ash-CeO2 with Monomers