Izvorni znanstveni članak
Absorption of longitudinal ultrasonic waves in polymer solution (polymethyl methacrylate)
Mostafa A. Sidkey
; National Institute of Standards, Cairo, Egypt
Ahlam M. Abd El-Fattah
; National Institute of Standards, Cairo, Egypt
Sažetak
Measurements of the change of absorption coefficient of longitudinal ultrasonic waves were carried out over the temperature range from I0°C to 50 °C in a 2% solution of polymethyl methacrylate in benzene irradiated with intense ultrasonic waves. The ultrasonic absorption measurements were performed by the pulse technique at frequencies of 2.5, 4, and 6 MHz. A marked change in absorption coefficient was observed as the temperature, and intensity of ultrasonic waves increased. A qualitative discussion is given on the assumption that the structural changes induced by intense ultrasonic waves, as well as by the temperature are related to changes in the number of degraded groups in the polymeric network.
Ključne riječi
Hrčak ID:
328921
URI
Datum izdavanja:
8.8.1983.
Posjeta: 352 *