独立気泡ポリエチレンフォームにおける動的圧縮弾性率の時間変化への気泡破壊の影響

概要

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Effects of cell destruction on thermal resistance in foamed plastics were studied by time dependence of dynamic compression modulus of four closed-cell polyethylene based foams at temperatures under load. Logarithm of time t50%, at which the dynamic compression modulus came to be 50% of its initial value has been found to be a linear function of reciprocal of the absolute temperature, T−1, in all foams before destruction of cell and in two PE foams after destruction of cell. Because of decrease of the resistance against the internal pressure of the cells by cell destruction, the amount of initial decrease of dynamic compression modulus increases. However, the temperature at which dynamic compression modulus starts to decrease rose with cell destruction, and thermal resistance was improved.