Summary
Absorption measurements of ultrasonic longitudinal waves in vulcanized natural rubber with and without carbon loading (50/100 carbon to rubber) are presented within the temperature and frequency ranges from 4 °C to 70 °C and from 0.4 MHz to 4 MHz. Experimental data were obtained by measuring, with a torsion balance, ultrasonic attenuation due to rubber samples immersed in water. Diagrams of absorption versus temperature for carbon loaded natural rubber show the usual behaviour of vulcanized rubbers. Corresponding diagrams for unloaded natural rubber show minima which indicate discrimination between two different relaxation effects. An unusual example of absorption decreased by carbon loading has been detected.
Riassunto
Si riportano misure di assorbimento delle onde ultrasonore longitudinali in gomma naturale vulcanizzata, senza carica e con 50 parti di nero fumo per 100 di gomma, per frequenze tra 0,4 MHz e 4 MHz e temperature tra 4 °C e 70 °C. I coefficienti di assorbimento sono stati ottenuti misurando, mediante una bilancia di torsione, l’attenuazione che subisce un fascio di ultrasuoni propagantesi in acqua, nell’attraversare i campioni di gomma. L’assorbimento, in funzione della temperatura, presenta, per la gomma con carica, il comportamento già noto per le gomme sia naturali che sintetiche. Quello relativo alla gomma naturale senza carica presenta un minimo, che indica una separazione tra due diversi effetti di rilassamento. Si è trovato un esempio di diminuzione del coefficiente di assorbimento con la carica.
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Gabrielli, I., Iernetti, G. Measurements of ultrasonic absorption in rubber. Nuovo Cim 1, 403–413 (1955). https://doi.org/10.1007/BF02855169
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DOI: https://doi.org/10.1007/BF02855169