The scattering of light from thin polymer films.IV. Scattering from oriented polymers
作者:
Forrest H. Norris,
Richard S. Stein,
期刊:
Journal of Polymer Science
(WILEY Available online 1958)
卷期:
Volume 27,
issue 115
页码: 87-114
ISSN:0022-3832
年代: 1958
DOI:10.1002/pol.1958.1202711508
出版商: Interscience Publishers, Inc.
数据来源: WILEY
摘要:
AbstractThe scattering of both unpolarized and polarized light by a series of stretched polyethylene films has been studied. The radiation envelope of the scattered light loses its cylindrical symmetry upon stretching. The dissymmetry depends upon the orientation of the stretching direction of the film as does the intensity of scattered light. The results imply a scattering unit which is anisotropic both in shape and in polarizability. The largest dimension and highest polarizability lie in the stretching direction. The Debye‐Bueche theory has been generalized to describe oriented anisotropic systems. The single parameter,a, describing the size of the heterogeneity is replaced by two parameters,aandc. The mean‐square dielectric constant fluctuation η2depends upon the principal polarizabilities of the scattering unit and upon its orientation. The parameters are evaluated for the series of polyethylene samples. A model is proposed which accounts for the variation of the parameters as well as the changes occuring during melting and crystallizing the pol
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