Abstract
Egyptian poly(ethyleneterephthalate) (PET) fibers in the drawn state show considerable optical and mechanical anlsotropy. The polarizing interference microscope is used with a fiber manipulation device to study, dynamically, the variation of refractive indices and birefringence of PET fibers with the draw ratio. In addition, the resulting data were used to calculate the strain optical coefficient, Poisson's ratio, the mean square density fluctuation under different annealing conditions, as well as several other parameters and constants. Also, an empirical formula has been applied to demonstrate the variation of the cross-sectional area of PET fibers with draw ratio and the constants of this formula are determined. Microinterferograms are given for illustration. The change of refractive index profile of annealed PET fibers at different conditions are also shown.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
