Abstract
The internal friction spectra of cured epoxy T-107 and a fiberglass reinforced plastic based on it are studied. In the temperature dependence of mechanical losses, β and γ relaxation maxima are found below the glass transition temperature with activation energies of Eβ = 0.30 ± 0.05 eV and Eγ = 0.18 ± 0.04 eV, respectively. The first maximum is associated with the vibrations of the defective oxygen atoms of the epoxy groups of the polymer network, and the second maximum is attributed to the vibrations of the lateral OH groups of the main polymer network. The internal friction of the epoxy polymer in the region of α relaxation process has been studied. In this region, two segments with an intersection point at the glass transition temperature are seen in the temperature dependence of the internal friction in coordinates lnQ−1 vs. 1/T. The high temperature segment of the internal friction background is used to estimate the energies of migration and formation of vacancy-like defects in the amorphous matrix of glass reinforced plastics, which are associated with delocalized oxygen and equal to Em = 0.72 ± 0.05 eV and Ev = 1.41 ± 0.06 eV, respectively.
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ACKNOWLEDGMENTS
The authors are grateful to V.V. Avdeev and A.V. Kepman for providing the initial components for the preparation of samples and useful discussions, and to A.I. Bocharov for performing experiments on a scanning electron microscope.
Funding
This study was financially supported by the Ministry of Science and Higher Education within the basic part of State assignment (project no. FZGM-2020-007).
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Kalinin, Y.E., Kudrin, A.M., Ovdak, O.V. et al. Internal Friction in an Epoxy Polymer and a Fiberglass Reinforced Plastic Based on It. Polym. Sci. Ser. A 64, 1–9 (2022). https://doi.org/10.1134/S0965545X22010047
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DOI: https://doi.org/10.1134/S0965545X22010047