OPTOTHERMAL PROPERTIES OF FIBERS .4. OPTICAL-PROPERTIES OF NYLON-66 FIBERS AS A FUNCTION OF QUENCHING PROCESS

In this work, optical properties of samples of nylon 66 fibers were qu enched in coarse-grained ice after annealing in the temperature range 80-180 degrees C for 1-10 h. Two independent techniques were used to s tudy optical parameters in these fibers. The first technique is the ap plication of the diffraction technique to study the effect of quenchin g on the swelling factors of these fibers for some different liquids a t room temperature of 25 +/- 1 degrees C. The second method dealt with the application of multiple-beam Fizeau fringes in transmission to es timate the refractive indices and birefringence of the skin and core o f these fibers. The obtained results were utilized to calculate the po larizability per unit volume, isotropic refractive indices, and the Ca uchy's dispersion constants. The relationship between n(s)(parallel to ,perpendicular to), n(c)(parallel to,perpendicular to), n(a)(parallel to,perpendicular to), Delta n(s), Delta n(c), Delta n(a), n((iso)s), n ((iso)c), and n((iso)a)n(iso)s, and different annealing times and temp eratures R,n, is given for these fibers. Microinterferograms and curve s are also given. (C) 1996 John Wiley & Sons, Inc.