Absorption and velocity of ultrasonic waves in interlinked SBR composite

The ultrasonic properties of self-adhered SBR (single-, double- and triple- layered) have been investigated as a function of both carbon black (HAF) co ntent in one layer and temperature. The propagation velocity and the absorp tion per wavelength of longitudinal ultrasonic waves of frequency 2 MHz hav e been measured in the temperature range from 27 degrees C to 120 degrees C , by pulse echo immersion technique. The variation of the longitudinal ultr asonic modulus with temperature has been derived from these measurements. T he percolation concentration of HAF black was confirmed to lie at about 35 phr. (C) 2000 Elsevier Science Ltd. All rights reserved.