Structure and appearance of residual polarization in thin films of polyvinylidene fluoride prepared via the Langmuir-Blodgett method

Autor: S. G. Yudin, V.V. Kochervinskii, H. A. Arkharova, V. V. Klechkovskaya, Boris V. Lokshin, I. S. Zanaveskina
Rok vydání: 2010
Předmět:
Zdroj: Polymer Science Series A. 52:40-48
ISSN: 1555-6107
0965-545X
DOI: 10.1134/s0965545x10010062
Popis: The relationship between electrophysical properties of super thin Langmuir-Blodgett films of polyvinylidene fluoride and their structural parameters via electron-diffraction and IR-spectroscopy methods was studied. According to analysis of the data, α and γ modifications were formed in addition to the β form. The occurrence of the α and γ species, which were responsible for the conformations TGTG − and T 3 GT 3 G −, was detected both from the absorbance bands and from the respective reflections in the electron-diffraction patterns. In addition, the electron-diffraction data showed the formation of stratified textures. The polarization-switching curves acquired at 36°C revealed a low degree of spontaneous polarization within a wide energy distribution of domains, which were characterized by an average coercive field of 400 MV/m that reflected the change of polymorphous transformations in an electric field. Moreover, at 49°C, the spontaneous-polarization-switching curves indicated a process with a low coercive field. The observations probably are related to the higher mobility in the crystals of the α phase that might have eased the spontaneous polarization switching.
Databáze: OpenAIRE
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