Vibrational spectroscopic study on ferroelectric phase transition of vinylidene fluoride-trifluoroethylene copolymers: 2. Temperature dependences of the far-infrared absorption spectra and ultrasonic velocity

Kohji Tashiro, Yuzo Itoh, Shin Nishimura, Masamichi Kobayashi

研究成果: ジャーナルへの寄稿記事

15 引用 (Scopus)

抜粋

The temperature dependence of far infrared absorption spectra was measured for vinylidene fluoride-trifluoroethylene (VDF-TrFE) copolymers with various VDF contents. For 55, 72 and 82 mol% VDF samples, the trans-gauche conformational transition was detected clearly. Near the ferroelectric phase transition temperature of the 55 mol% VDF sample, the band at 116 cm-1, the skeletal torsional mode of the trans zig-zag conformation, was observed to transfer continuously to the position of the torsional band of the gauche type skeletal conformation at 108 cm-1, suggesting a softening behaviour of the skeletal vibrational mode in the structural transition region. The ultrasonic modulus was found to exhibit an unusual minimum in the same temperature region. This anomalous behaviour was interpreted in terms of the coupling between the optical phonon of the skeletal torsional mode and the acoustic phonon through the piezoelectric and electrostrictive effects.

元の言語英語
ページ(範囲)1017-1026
ページ数10
ジャーナルpolymer
32
発行部数6
DOI
出版物ステータス出版済み - 1991
外部発表Yes

    フィンガープリント

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

これを引用