Abstract
Measurements of ultrasonic absorption were carried out for cellulose acetate in cyclohexanone at frequencies from 0.5 to 130 MHz over a temperature range of 0 to 30°C. The molecular weight of the sample was 5.8×104. The apparatus was set up according to the cylindrical resonator technique to determine ultrasonic absorption coefficients with high accuracy on the low frequency side, especially below 10 MHz. The relaxation process observed could not be expressed by discrete relaxation mechanisms, such as single or double relaxations. This relaxation process may be expressed well by an equation which has a broad distribution of relaxation frequencies, such as the following,
In the cellulose acetate cyclohexanone system, the segmental motions of the polymer chain are strongly coupled with various molecular motions, such as normal mode motion (Rouse–Zimm type) and intramolecular motion.
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Kato, S., Nomura, H. & Miyahara, Y. Cylindrical Resonator Technique for Ultrasonic Absorption Measurement and Its Application to Cellulose Acetate–Cyclohexanone System. Polym J 11, 455–461 (1979). https://doi.org/10.1295/polymj.11.455
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DOI: https://doi.org/10.1295/polymj.11.455