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Normal-modes calculation was made for a series of model polymer chains of vinylidene fluoride tetrafluoroethylene (VDF-TFE) copolymers so as to interpret the systematic variation in the i.r. and Raman spectra. The model chains are alternating copolymers of [-(VDF)m(TFE),- ] with m/n = ~/0, 8/2, 5/5, 2/8 and 0/~. Utilizing the normal-modes frequencies and the corresponding eigenvectors calculated for these model chains, the frequency-phase difference dispersion curves and the density of state (or the frequency distribution function) were constructed. Based on these results, the assignments of the intrinsic bands of the VDF sequence, TFE sequence and VDF-TFE boundary were made and the changes in the i.r. and Raman spectra observed at room temperature were interpreted.

Посилання на статтю:

Structural changes in ferroelectric phase transitions of vinylidene fluoride-tetrafluoroethylene copolymers: 2. Normal-modes analysis of the infra red and Raman spectra at room temperature / Kohji Tashiro*, Hiroyoshi Kaito and Masamichi Kobayashi // Polymer. – 1992. – Vol 33. – P. 2929-2933.

Structural changes in ferroelectric phase transitions of vinylidene fluoride-tetrafluoroethylene copolymers: 2. Normal-modes analysis of the infra red and Raman spectra at room temperature - Завантажити.