軟質ポリウレタンフォームにおける動的圧縮弾性率の時間変化による耐熱性の評価

書誌事項

タイトル別名
  • Evaluation of Thermal Endurance Characteristics by Time Dependence of Compression Dynamic Modulus of Flexible Polyurethane Foams
  • ナンシツ ポリウレタン フォーム ニ オケル ドウテキ アッシュク ダンセイリツ ノ ジカン ヘンカ ニ ヨル タイネツセイ ノ ヒョウカ

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抄録

For evaluation of thermal endurance in foamed plastics, the temperature and time dependence of the compression dynamic modulus of seven flexible polyurethane foams were investigated by dynamic viscoelastic measurements. In a certain temperature range, the compression dynamic modulus of each polyurethane foam lessened gradually with time, presumably due to a relaxation phenomenon of foam skeletons accompanying deterioration in the bending stiffness of the skeleton. The logarithm of time t, by which the compression dynamic modulus fell to 50% of its initial value, has been found to be a linear function of reciprocal temperature T-1. The parameter A is the slope of this function and has been found to correlate negatively, with the porosity but with the hardness positively.<br>

収録刊行物

  • 高分子論文集

    高分子論文集 65 (4), 317-320, 2008

    公益社団法人 高分子学会

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