| Autor: |
Zotkin, M. A., Wozniak, A. I., Alentiev, D. A., Lunev, I. V., Galiullin, A. A., Bermeshev, M. V. |
| Předmět: |
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| Zdroj: |
Russian Journal of Applied Chemistry; Jul2023, Vol. 96 Issue 7, p728-736, 9p |
| Abstrakt: |
Dielectric properties of isomeric glassy 5-cyclohexyl-2-norbornene polymers synthesized by the metathesis and vinyl-addition schemes were studied in a wide range of electric field frequencies (0.1–1 × 106 Hz) and temperatures (from –100 to +200°С). These polymers have close values of the dielectric constant (2.28–2.29 at the electric field frequency of 1 MHz and 25°С) and low values of dielectric loss caused by dipole-segmental loss. Analysis of the imaginary part of the dielectric spectrum shows that the vinyl-addition polymer is characterized by a single relaxation process and the metathesis polymer, by three processes associated with cooperative segmental motion of backbones, with changes in the conformation of the cyclohexyl substituent, and with local motion in monomeric units. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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