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Ultrasonic detection of segmental relaxations in thermoplastic polyurethanes
Author(s) -
Aziz A. W.,
Lawandy S. N.
Publication year - 1986
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1986.070310605
Subject(s) - materials science , composite material , ultrasonic sensor , thermoplastic , attenuation , polymer , atmospheric temperature range , acoustics , thermodynamics , physics , optics
The change in attenuation of longitudinal waves has been measured as a function of frequency and temperature for thermoplastic polyurethanes of different hardness covering a range from rubbery hardness to plastic. Analysis of the results show some segmental relaxations and the activation energies were calculated from the ultrasonic measurements. These activation energies were indirectly related to the fatigue failure of the polymer. This failure was expressed as cut growth.