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- Title
Internal Friction in an Epoxy Polymer and a Fiberglass Reinforced Plastic Based on It.
- Authors
Kalinin, Yu. E.; Kudrin, A. M.; Ovdak, O. V.; Popov, I. I.
- 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.
- Subjects
INTERNAL friction; GLASS transition temperature; TRANSITION temperature; POLYMERS; GLASS fibers; POLYMER networks
- Publication
Polymer Science -- Series A, 2022, Vol 64, Issue 1, p1
- ISSN
0965-545X
- Publication type
Article
- DOI
10.1134/S0965545X22010047