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Title: On the diffusion nature of α-relaxation in the amorphous polymer T20-60
Russian version
Darinskii B. M. 1, Kalinin Yu. E. 2, Kashirin M. A. 2, Kepman A. V. 3, Safonov K. S. 2, Makagonov V. A. 2, Popov I. I. 2
1Voronezh State University, Voronezh, Russia
2Voronezh State Technical University, Voronezh, Russia
3Lomonosov Moscow State University, Moscow, Russia
Email: popovich_vano@mail.ru
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The temperature dependences of internal friction Q-1(T) for the T20-60 epoxy polymer hardened at room temperature and deposited on a glass-ceramic substrate were studied. The Q-1(T) dependence of the polymer structure in the region of the α-relaxation process has a maximum associated with the diffusion of vacancy-like oxygen defects of the end groups of the epoxy resin. In the α-relaxation region, three straight sections with different slope angles are observed in the ln Q-1(1/T) dependence for the mboxT20-60 polymerized at room temperature. Based on the ln Q-1(1/T) experimental dependences, the migration energy and formation energy of vacancy-like oxygen defects of epoxy groups for the polymer under study were estimated. In the pre-hardened T20-60 polymer, in the α-relaxation region on the ln Q-1(1/T) dependence for the low-temperature branch of the Q-1 maximum, two straight sections with different slope angles are observed, associated with the migration of vacancy-like oxygen defects entering the polymer network. The migration energy and formation energy of vacancy-like oxygen defects in the main polymer network were estimated, which turned out to be Em2 = 0.88 ± 0.09 eV and Ev2= 0.91±0.09 eV. The ln Q-1(1/T) dependence for the high-temperature branch of the Q-1 maximum has one straight section. The assessment of the activation energy on this branch showed higher values than on the low-temperature branch of the Q-1 maximum, which indicates the diffusion nature of the α-relaxation process of the T20-60epoxy binder. Keywords: internal friction, epoxy polymer, α-relaxation, glass transition temperature.
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