Im. Fouda et al., OPTOTHERMAL PROPERTIES OF FIBERS .7. OPTICAL INVESTIGATION OF ANNEALED NYLON-6 FIBERS, Journal of applied polymer science, 65(7), 1997, pp. 1293-1306
The influence of annealing on the birefringence of nylon-6 fibers was
examined. These fibers were found to show considerable optical anisotr
opy. Three independent techniques were used to study the optical aniso
tropy in these fibers. The first technique to determine the diameter o
f the fiber from the diffraction pattern was using a He-Ne laser beam.
The second technique was the application of the Becke-line technique
to study the effect of annealing on the skin layer of these fibers at
different temperatures for a constant time of 5 h. The third is the ap
plication of a double-refracting interference microscope (the Pluta po
larizing interference microscope). The double-beam technique is consid
ered as the most suitable technique for determining the mean refractiv
e indices and the double refraction of the annealed samples at differe
nt temperatures. (155 and 175 degrees C and at two constant times 7 an
d 9 h). Microinterferograms and curves are given for illustration. (C)
1997 John Wiley & Sons, Inc.