エポキシ樹脂における残留応力の発生と硬化物の化学構造の影響

Abstract

エポキシ樹脂は通常硬化および冷却過程で収縮する。他の材量との接着など、何らかの理由で収縮が拘束されると、拘束を受けた収縮は残留応力に変換される。この残留応力の大きさは、硬化樹脂のガラス状領域での弾性率および温度硬化収縮の双方に依存する。エポキシ網目の残留応力に及ぼす化学構造の影響を論じた。すなわち、低ガラス状弾性率および低熱膨張係数をもつエポキシ樹脂をいくつか紹介した。

Epoxy resins usually shrink during the curing and cooling processes. When the shrinkage in constrained by some reason, such as an adhesion with other materials, the constrained shrinkage is converted to residual stress. The magnitude of the residual stress depends on both the elastic modulus and the thermal and curing shrinkage in the glassy region of the cured resins. The effect on the chemical structure on the residual stress in epoxy networks was discussed. Namely, some epoxy resins which have lower glassy modulus and lower thermal expansion coefficient were introduced.