Premium
Optical properties of extruded polyethylene thin films related to anisotropy and inhomogeneous microstructure
Author(s) -
Bernabeu E.,
Boix J. M.
Publication year - 1996
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.10514
Subject(s) - anisotropy , materials science , microstructure , polyethylene , refractive index , optical anisotropy , optics , optical density , thin film , series (stratigraphy) , composite material , condensed matter physics , physics , nanotechnology , optoelectronics , paleontology , biology
In this paper a method has been developed to extend the use of the well‐known expression of Clausius‐Mosotti for inhomogeneous materials, considering their anisotropy through a series expansion based on the structural factor of nonsphericity. This is related to experimental results available from the ordinary and extraordinary refractive indices of a set of samples of low‐density polyethylene films, where such phenomena are observed. Here results are obtained which are valid for the microscopic optical response, as it is shown by the linear fitting of these general expressions, with excellent correlation coefficients. Furthermore, if we apply the Bergman‐Milton limits, we can theoretically confirm the existence of two neutral lines experimentally obtained.