Accession Number:

ADA237015

Title:

Effects of Annealing on the Polarization Switching of Phase 1 Poly(vinylidene Fluoride)

Descriptive Note:

Technical rept.,

Corporate Author:

RUTGERS - THE STATE UNIV PISCATAWAY NJ DEPT OF MECHANICS AND MATERIALS SCIENCE

Report Date:

1991-05-01

Pagination or Media Count:

29.0

Abstract:

To obtain information about microscopic processes involveded in the polarization switching in uniaxially oriented polyvinylidene fluoride film, a least squares estimation of nonlinear parameters was developed to yield parameters of an equation which describes the nucleation and domain growth process. The analysis showed that the value of the domain growth speed increased as Ta increased. This is consistent with X-ray diffraction data which indicated that the annealing process brought about better chain packing and increased crystallite perfection. The analysis also showed that the nucleation probably significantly increased as Ta increased. This result was interpreted in terms of a morphological transformation, which was indicated by the decrease in elastic modulus with increasing Ta with no corresponding loss of orientation. It is suggested that the annealing process brought about an increase in the number of nucleation sites as a result of a transformation from a fibrous structure to a crystal-amorphous series structure which has increased boundary zone area.

Subject Categories:

  • Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE