OPTOMECHANICAL PROPERTIES OF FIBERS .7. RELATION BETWEEN COLD DRAWINGBEHAVIOR OF NYLON-6 FIBERS FROM AN EGYPTIAN MANUFACTURER AND THEIR OPTICAL-PROPERTIES

Optical properties change with strain produced by different stresses. Undrawn Nylon 6 fibres from an Egyptian manufacturer have been measure d dynamically by interferometry. Both two- and multiple-beam interfero metric techniques were used to determine refractive indices and birefr ingence of the investigated Nylon 6 samples with strain produced by di fferent stresses. Using a micro-strain device attached to a microscope stage and through the application of the appropriate mathematical equ ations, the refractive indices and the birefringence values were deter mined as a function of the draw ratios. The resulting data were utiliz ed to calculate the polarizability per unit volume, Poisson's ratio, t he strain optical coefficient and several other parameters and constan ts. Relationships between the various optical parameters and the draw ratios are plotted and the effect of draw ratio on the refractive inde x profile is studied. Microinterferograms are given for illustration.