動的圧縮弾性率によるポリ塩化ビニルフォームおよび独立気泡ポリエチレンフォームの耐熱性の評価

抄録

Effect of static strain on thermal deformation in foamed plastics was investigated in terms of the time dependence of compression dynamic modulus for polyvinyl chloride and closed-cell polyethylene based foams. In all foams, except for closed-cell polyethylene based foams subjected to 30 % static strain, the logarithm of time t at which the compression dynamic modulus decreased to 50 % of its initial value has been found to be a linear function of reciprocal absolute temperature T⁻¹, and the correlation coefficient for the foams was more than 0.91. Because the stiffness of foam skeletons is influenced by inner pressure in closed-cells of polyvinyl chloride based foams, thermal endurance of the foams is improved by larger static strain.