材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
芳香族ポリイミドの副分散
神戸 博太郎加藤 貞二空閑 重則横田 力男
著者情報
ジャーナル フリー

1972 年 21 巻 224 号 p. 405-409

詳細
抄録

The polypyromellitimide exhibits an excellent thermal stability due to its rigid structure of the chain molecules. In the present paper, the mechanical and dielectric secondary dispersion of such a polymer are discussed, and are correlated to their structure. The complex dielectric properties of polypyromellitimide and its relating polymers were measured at frequencies from 30 to 3MHz in the temperature range of -90°∼120°C. The viscoelastic properties of Kapton H polypyromellitimide film were measured at a higher temperature range of 20°∼500°C by means of a torsional pendulum. The stress-strain curves of H film were measured with a tensile testing apparatus at 20°C, and the thermal contraction of a stretched H film sample was also measured with the thermo-mechanical analysis (TMA) apparatus in the temperature range of 20°∼600°C. Three dispersions have been found in these measurements. The lowest one found at -60°C has been ascribed to the absorbed water. The middle one found at 70°C has also been related to the absorbed water. The highest one, which was revealed in this work for the first time, has been assigned to rearrangement of oriented metastable molecules at higher temperatures. The experimental results of TMA and the X-ray diffraction patterns of unstretched and stretched H films support this conclusion.

著者関連情報
© 日本材料学会
前の記事 次の記事
feedback
Top