Temperature dependency of elastic moduli and internal dilational and shear frictions of polyetherimide

Mikio Fukuhara

研究成果: Article査読

24 被引用数 (Scopus)

抄録

To investigate the thermally activated structural change of polyetherimide, longitudinal and transverse wave velocity, six kinds of elastic parameters (Young's, shear, and bulk moduli, Lame parameter, Poisson's ratio, and Debye temperature), and dilational and shear internal frictions were simultaneously measured over a temperature range 69-474 K, using the ultrasonic pulse method. All elastic moduli decreased with increasing temperature, suggesting a lowering of molecular bonding strength. From shear internal friction, the 190,314,371,395, and 430 K peaks are interpreted as the γ-[derived from -C (=O)-motion], β1*- (interplane slippage between benzene rings), β- (softening-glass transition) peaks, and rotational vibration of main benzene rings and a local relaxation of the main chain, respectively. The abrupt increase peak from 449 K in dilational friction would be a low-temperature side shoulder of the α-glass-transition peak.

本文言語English
ページ(範囲)759-764
ページ数6
ジャーナルJournal of Applied Polymer Science
90
3
DOI
出版ステータスPublished - 2003 10月 17

ASJC Scopus subject areas

  • 化学 (全般)
  • 表面、皮膜および薄膜
  • ポリマーおよびプラスチック
  • 材料化学

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