ISSN:
0098-1273
Keywords:
Physics
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Brillouin scattering spectra of poly(vinylidene fluoride) films subject to stretching have been studied as a function of draw (stretch) ratios. The longitudinal sound velocity is found to be isotropic for the unoriented film, but as the film is stretched, the velocity along the direction of stretch becomes higher than that perpendicular to it. The increase in the sound velocity is due to the induced orientation of the chains in the amorphous and the crystalline regions. The Hermans orientation parameter has been determined as a function of stretch from the velocity data. The result indicates the occurrence of recrystallization and reorganization as a result of transformation to form I crystallites from the amorphous phase as the film is stretched.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1981.180190604
