Brillouin and Rayleigh Scattering in Polybutadiene.
Abstract
The molecular light scattering of polybutadiene from 110 to 350K was carried out. The study includes the measurements of Brillouin shift, Brillouin linewidth and Rayleigh depolarization ratios as a function of temperature. It has been found that the hypersonic frequency displays a discontinuity at the glass temperature Tg. The hypersonic attentuation coefficient over one wavelength has also been determined as a function of temperature. No quantitative theory has been found to be able to describe the sound attenuation above Tg. The Krishnan effect was also observed below 250K. This is the first experiment which observes the evolution of the Krishnan effect. It has been pointed out that the frozen-in density fluctuation mechanism fails to explain the effect. The frozen-in fluctuations of the dielectric anisotropy is suggested to be a possible mechanism for the Krishnan effect. (Modified author abstract)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 22, 1974
- Accession Number
- AD0776665
Entities
People
- C. H. Wang
- Y. Y. Huang
Organizations
- University of Utah