OPTOMECHANICAL PROPERTIES OF FIBERS .6. STRUCTURAL CHARACTERISTICS AND OPTICAL-PROPERTIES OF PE FIBERS

The polarizing interference microscope is used with a fibre manipulati on device to study, dynamically, the variation of refractive indices a nd birefringence of PE fibres with the draw ratio. The resulting data were used to calculate Poisson's ratio over all strain ranges. In addi tion, the strain optical coefficient and some other parameters and con stants were calculated. Also, an empirical formula is applied to demon strate the variation of the cross-sectional area of PE fibres with dra w ratio and the constants of this formula are determined. Microinterfr ograms are given for illustration.