OPTO THERMAL-PROPERTIES OF FIBERS - IX - STUDY CHANGES OF OPTICAL-PARAMETERS BY MULTIPLE-BEAM TECHNIQUE DUE TO THERMAL ANNEALING FOR NATURAL SILK FIBERS
Aa. Hamza et al., OPTO THERMAL-PROPERTIES OF FIBERS - IX - STUDY CHANGES OF OPTICAL-PARAMETERS BY MULTIPLE-BEAM TECHNIQUE DUE TO THERMAL ANNEALING FOR NATURAL SILK FIBERS, Journal of applied polymer science, 69(8), 1998, pp. 1495-1504
Multiple-beam Fizeau fringes were used for studying the effect of the
annealing process on the refractive indices and birefringence of natur
al silk fibers (best yellow Italian silk, Ford & Co. Ltd). Silk fibers
were annealed at a constant time of 2 h with different annealing temp
eratures ranging from 60 to 160 +/- 1 degrees C. A scanning electron m
icroscope was used for measuring the cross-sectional shape and a longi
tudinal view of the natural silk fibers. The Becke-line method was use
d for measuring the skin refractive indices and the birefringence of t
he natural silk fibers. The thermal coefficient of the refractive inde
x, Cauchy dispersion constants, dispersive power, dielectric constant
at infinity, polarizability per unit volume, isotropic polarizability,
and isotropic refractive index were determined interferometrically. M
icrointerferograms and curves are given for illustration. (C) 1998 Joh
n Wiley & Sons, Inc. J Appl Polym Sci 69: 1495-1504, 1998.