Low‐temperature elastic moduli and internal dilational and shear friction of polymethyl methacrylate

Mikio Fukuhara, Asao Sampei

研究成果: Article査読

37 被引用数 (Scopus)

抄録

Longitudinal and transverse wave velocity, five kinds of elastic parameters (young, shear and bulk moduli, Lamér; parameter. Poisson's ratio) and dilational and shear internal friction of polymethyl methacrylate were simultaneously measured over a temperature range 68–400K, using the ultrasonic pulse method. All elastic moduli decrease with increasing temperature, suggesting lowering of molecular bonding strength. From dilational and shear internal frictions, the 139, 382, and 385K peaks are interpreted as rotation of x‐methyl estel groups, micro Brownian motion of main chains and stress relaxation, and abrupt increases from 242 and 395K are regarded as free motion of side chains and glass transition, respectively. ©1995 John Wiley & Sons, Inc.

本文言語English
ページ(範囲)1847-1850
ページ数4
ジャーナルJournal of Polymer Science Part B: Polymer Physics
33
12
DOI
出版ステータスPublished - 1995 1月 1

ASJC Scopus subject areas

  • 凝縮系物理学
  • 物理化学および理論化学
  • ポリマーおよびプラスチック
  • 材料化学

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