Abstract
Dielectric properties of solid films of poly(dichloro phosphazene) (PCPN), poly(diphenoxy phosphazene) (PPPN), and poly(difluoroethoxy phosphazene) (PFPN) were studied in the frequency range from 0.1 to 100 kHz. PCPN exhibited only one relaxation peak (named as α process), while PPPN and PFPN exhibited two loss maxima (α and β) in the dielectric loss ε″ curve within the temperature range between 90 and 460 K. The α process for the each sample was seen just above its glass transition temperature Tg, while the β relaxation was observed only for PPPN and PFPN in the region far below their Tg. This result indicates that the β process is due to rotation of the side groups. Based on the simplest two site model, we estimated the amplitude of the rotational oscillation of the side groups and the energy difference between the two sites. Besides these α and β relaxations, PPPN and PFPN showed the mesophase transition at 400 and 345 K, respectively, where the dielectric constant increased step-wise. The dielectric constant in the mesophase was partly attributable to the polarization of the type-A dipoles.
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Uzaki, S., Adachi, K. & Kotaka, T. Multiple Dielectric Relaxations in Solid Polyorganophosphazenes. Polym J 20, 221–229 (1988). https://doi.org/10.1295/polymj.20.221
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DOI: https://doi.org/10.1295/polymj.20.221
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