Premium
Determination of polyolefin film properties from refractive index measurements. II. Birefringence
Author(s) -
Schael George W.
Publication year - 1968
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1968.070120424
Subject(s) - polyolefin , refractive index , birefringence , crystallinity , materials science , polypropylene , polyethylene , refractometer , refractometry , refraction , composite material , step index profile , optics , polymer chemistry , optoelectronics , fiber , physics , graded index fiber , fiber optic sensor , layer (electronics)
The use of refractive index data for studying changes in oriented polyolefin films has been demonstrated. Application of this technique to oriented polypropylene and polyethylene films showed that the birefringence is a linear function of the refractive index in the direction of maximum orientation. By utilizing refractive index, density, and crystallinity data the crystalline refractive indices n c and ( n a + n b )/2 and polarizabilities α ∥ and α ⊥ could be estimated for polypropylene and polyethylene.