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Determination of thermal degradation of vulcanized rubbers using diffracted SH ultrasonic waves
Authors:Mikio Fukuhara  Yoshiyuki Kuwano  Atsuko Tsugane  Masamitsu Yoshida
Abstract:Thermal degradation of NBR and CR heated in air was determined by analysis of diffracted SH ultrasonic waves. Thermal degradation was evaluated by examining wave pattern characteristics of SH waves passing through the surface depth between transmitter and receiver. Thermal crosslinking of main chains in thermally degraded NBR and CR, accompanied by lowering of mechanical properties, can evaluate by decrease of launched time and appearance of 0.9 MHz side peak of the power spectrum. The thermal degradation also causes phase delay at high frequencies, showing regression of viscoelasticity associated with formation of dangling ends. © 1999 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 37: 497–503, 1999
Keywords:NBR and CR  diffracted SH waves  thermal degradation  frequency shift  phase delay  crosslinking
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