軟質ポリウレタンフォームにおける動的圧縮弾性率による耐熱性の評価

概要

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For evaluation of thermal endurance in foamed plastics, temperature and time dependence of compression dynamic modulus of four flexible polyurethane foams was investigated by dynamic viscoelastic measurements. In an interested temperature range, compression dynamic modulus of each polyurethane foams lessened gradually with time, presumably due to thermal degradation of foam skeletons accompanying deterioration in bending stiffness of the skeleton. Logarithm of time t, at which the compression dynamic modulus came to be 90%, 80% and 50% of its initial value at the beginning of the dynamic measurement, has been found to be a linear function of reciprocal temperature T -1. Thermal endurance characteristics of flexible polyurethane foams can be evaluated from the linear relations between T-1 and logarithm of time t at which the compression dynamic modulus came to be 50% of its initial value.