Evaluation of Thermal Endurance Characteristics by Time Dependence of Compression Dynamic Modulus of Flexible Polyurethane Foams

• ADACHI Hiromasa

  Nagoya Municipal Industrial Research Institute

Bibliographic Information

Other Title

• 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
• 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

Abstract

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>

Journal

• KOBUNSHI RONBUNSHU

  KOBUNSHI RONBUNSHU 65 (4), 317-320, 2008

  The Society of Polymer Science, Japan

Keywords

• Polyurethane Foam
• Dynamic Modulus
• Viscoelastic Measurement
• Porosity
• Hardness

Details

• CRID: 1390001206524676352
• NII Article ID: 10021120423
• NII Book ID: AN00085011
• DOI: 10.1295/koron.65.317
• ISSN: 18815685
• ISSN: 03862186
• NDL BIB ID: 9492416
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I9492416
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed