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Opto‐mechanical properties of fibres. Part 1. Optical properties and orientation of drawn polyethylene fibres
Author(s) -
Fouda IM,
Shabana HM
Publication year - 1999
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199903)48:3<181::aid-pi135>3.0.co;2-v
Subject(s) - birefringence , materials science , refractive index , polarizability , isotropy , optics , composite material , molecule , physics , optoelectronics , quantum mechanics
Changes in the structure of different drawn polyethylene(PE) fibres are studied by the Becke' line method andinterferometrically. The Becke' line method is used to study thechanges in the optical properties of the skin layer of PE undrawnfibres. A Pluta polarizing interference microscope is used todetermine the mean refractive indices and mean birefringence of thedrawn fibres. Some structural parameters, such as optical orientationfunction, electric polarizability difference and isotropicpolarizability (Δα/3α 0 ),are determined. This last parameter is found to be constant anddepends only on the fibre structure. The number of molecules per unitvolume and the distribution of segments at an angle with respect tothe draw ratio are also determined. The generalizedLorentz–Lorenz equation given by de Vries is used to determinePE fibre structural parameters. A comparison between the experimentaland those obtained using the Lorentz–Lorenz equation is given.A refractive index profile can assist fibre characterization. Anempirical formula is suggested to correlate the changes in A ,Δ n , f θ and θ with thedraw ratio, and its constants are determined. Microinterferograms andcurves are given for illustration. © 1999 Society of Chemical Industry