ポリアセタールの結晶状態を考慮したクリープ解析

概要

論文の詳細を見る
It is considered that there are two factors for polymer crystallization. One is crystallinity which is calculated by ratio of crystal and amorphous part, the other is crystalline state which represents interior morphology. Thus, adjustment of crystallinity and crystalline state was performed. As a result, crystal of POM is made up with spherulite. At first, crystal nucleation was observed. After then, crystalline growth occur radially from crystalline nucleus. It was understood to be able to make the sample with a different spherulite size by non-isothermal crystallization which means changing of cooling rate from melting condition. The other hand, crystallinity was increased with holding time remaining the shape of spherulite by isothermal crystallization. On each material, Arrhenius type of time-temperature superposition principle was confirmed on creep test. Creep behavior was suppressed with crystallinity by comparison between creep curves. However, it was confirmed that the shape of master curves are different between materials with different crystal grain size, because response of creep deformation to time passage is not same. Therefore, it was found that Grand master curve was obtained under the terms of same crystalline state, and it was able to estimate long term creep behavior on materials of arbitrary time, temperature and crystallinity.
日本実験力学会の論文