Broad-line nuclear magnetic resonance measurements have been performed for the proton resonance in an oriented 70:30 copolymer of vinylidene fluoride and trifluoroethylene. The spectra show two components with distinctly different linewidths. The broad component is identified with the crystalline regions and the narrow component with the amorphous. An appreciable reversible change in crystallinity with temperature was observed, which could significantly contribute to the pyroelectric response of this material. In addition, measurements through the Curie transition show the increasing libration of the chains prior to the transition, which could also contribute to the pyroelectric response.
Посилання на статтю:
A broad-line nuclear magnetic resonance study of a vinylidene fluoride/trifluoroethylene copolymer / J. Clements*, G. R. Davies and I. M. Wardt // Polymer. – 1992. – Vol 33. – P. 1623-1629.