Morphological Change of Unsaturated Polyester Resins Exposed to Ultraviolet Radiation

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  • KISHI Hajime
    Graduate School of Engineering, Himeji Institute of Technology, University of Hyogo
  • FUKUDA Shio
    Graduate School of Engineering, Himeji Institute of Technology, University of Hyogo
  • NAITO Takemi
    Graduate School of Engineering, Himeji Institute of Technology, University of Hyogo
  • MATSUDA Satoshi
    Graduate School of Engineering, Himeji Institute of Technology, University of Hyogo
  • MURAKAM Atsushi
    Graduate School of Engineering, Himeji Institute of Technology, University of Hyogo

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  • 紫外線照射による不飽和ポリエステル樹脂の形態変化
  • シガイセン ショウシャ ニ ヨル フホウワ ポリエステル ジュシ ノ ケイタイ ヘンカ

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Abstract

Morphological changes in surfaces of unsaturated polyester resins (isophtalic polyester resin and orthophtalic polyester resin) exposed to ultraviolet (UV) radiation were studied using several microscopic techniques. Changes in the surface roughness and the thickness of each resin layer were also evaluated quantitatively. The experimental results suggested the advantage of the isophtalic polyester resin on UV resistance. Although both resins have equivalent chemical structures except for the ester bonding sites and equivalent average crosslink density, the unit of drop-out from the surface after UV-induced degradation and the roughness of fracture surfaces were larger in the orthophtalic polyester resins than those in the isophtalic polyester resins. These results lead to an assumption that the difference in the UV resistance of both resins relates to the aggregated structure of microgels formed in the curing process of the resins.

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