Improvement in epoxy adhesives by introducing thiirane groups Investigation of reaction mechanism based on the model reaction

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  • IIJIMA Takao
    Department of Applied Chemistry, Faculty of Engineering, Yokohama National University
  • ITOH Tsuyoshi
    Department of Applied Chemistry, Faculty of Engineering, Yokohama National University
  • TOMOI Masao
    Department of Applied Chemistry, Faculty of Engineering, Yokohama National University
  • IKAWA Katsuhiro
    Research and Development Center, Advanced Materials Laboratory, Yokohama Rubber Co.
  • CHINO Keisuke
    Research and Development Center, Advanced Materials Laboratory, Yokohama Rubber Co.

Bibliographic Information

Other Title
  • チイラン構造の導入によるエポキシ系接着剤の改質
  • チイラン構造の導入によるエポキシ系接着剤の改質:モデル反応による反応機構の検討
  • チイラン コウゾウ ノ ドウニュウ ニ ヨル エポキシケイ セッチャクザイ ノ カイシツ モデル ハンノウ ニ ヨル ハンノウ キコウ ノ ケントウ
  • モデル反応による反応機構の検討

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Description

The ring opening reactions of phenyl glycidyl ether (PGE) and/or phenoxymethylthiirane (PT) and primary amines were investigated. Aniline, cyclohexylamine and n-octylamine were used as primary amines. The initial reaction rate of PT with aniline was larger than that of PGE with aniline, but PT did not react quantitatively due to existence of an equilibrium reaction in the former system. The reaction of PGE with aniline proceeded via addition and produced the 2 : 1 adduct as a final product, whereas addition and oligomerization reactions occurred competitively in the reaction of PT with aniline. The initial reaction of PGE was accelerated in the presence of PT and vice versa, and PT reacted quantitatively. These results indicated that the reaction of PGE was accelerated by thiolate anion and that the equilibrium reaction was retarded by PGE. The reaction behaviors of three-membered rings with other primary amines were similar to those with aniline. The improvement in the curing rate of epoxy adhesives by introducing thiirane groups could be explained in terms of the synergistic effect on enhancement in ring-opening reactivities of three-membered rings.

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