エポキシ樹脂のクリープ挙動に及ぼすフィジカルエージングの影響

抄録

This paper is concerned with the effect of physical aging on flexural creep behavior of epoxy resin. Epoxy resins were subjected to various degrees of physical aging by different thermal history, i.e., rapidly cooled, slowly cooled and aged epoxy resin. Long term flexural creep tests on these resins were carried out at a constant temperature, and short term flexural creep tests were simultaneously carried out at various temperatures.
The long term creep behavior of epoxy resin was obviously influenced by the degree of physical aging. The creep deformation decreased as the physical aging proceeded. Each long term creep behavior was estimated by applying the modified reciprocation law of time and temperature, which was proposed by a previous paper, to the short term creep behaviors. These estimated long term creep behaviors agree fairly well with the measured creep behaviors, in particular for physical aging proceeded epoxy resin. Furthermore, the time-temperature shift factor (horizontal shift factor) and temperature shift factor (vertical shift factor) of the modified reciprocation law of time and temperature decrease as the physical aging proceeds.