Low-Temperature Local Dissipative Processes in Polyvinyl Alcohol

The spectra of internal friction and temperature variation in the frequency of free damped torsional vibrations excited in a polyvinyl alcohol (PVA) sample in the temperature range from –150 to 0°C were investigated. Several local dissipative processes of low intensity were detected in the spectrum in the temperature range from –150 to –90°C and one more intense dissipative process in the temperature range from –70 to 0°C. According to these processes, deviations from the linear change in frequency of the vibration process were observed in the temperature-frequency relations in these temperature ranges. The mechanisms of internal friction for each of the dissipative processes are considered, and their probable structural interpretation is proposed. The defects of shear modulus arising in these processes are determined, and their contribution to the shear modulus of the entire PVA system is evaluated.

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Correspondence to N. A. Abaturova.

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Translated from Mekhanika Kompozitnykh Materialov, Vol. 54, No. 6, pp. 1173-1180, November-December, 2018.

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Lomovskoy, V.A., Abaturova, N.A., Lomovskaya, N.Y. et al. Low-Temperature Local Dissipative Processes in Polyvinyl Alcohol. Mech Compos Mater 54, 815–820 (2019). https://doi.org/10.1007/s11029-019-9785-5

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  • spectra of internal friction
  • defect of shear modulus
  • relaxation
  • dissipative processes