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

Mikio Fukuhara, Asao Sampei

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)1847-1850
Number of pages4
JournalJournal of Polymer Science Part B: Polymer Physics
Issue number12
Publication statusPublished - 1995 Jan 1


  • dilational friction
  • elastic moduli
  • low temperature
  • polymethyl methacrylate
  • shear friction

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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