TITLE:
Online Investigation of Optical Properties and Craze Propagation of Drawn Polypropylene Fiber by Using Interferometric Image Analysis
AUTHORS:
T. Z. N. Sokkar, K. A. El-Farahaty, E. A. Seisa, E. Z. Omar, M. Agour
KEYWORDS:
Areal Craze Density, Craze Propagation Velocity, Polypropylene Fibre, Pluta Polarizing Interference Microscope, Microscopic Image Analysis System (MIAS)
JOURNAL NAME:
Optics and Photonics Journal,
Vol.4 No.7,
July
25,
2014
ABSTRACT:
Pluta
polarizing interference microscope was used to follow the crazing that occur on
the surface of stretched polypropylene fibres at different drawing conditions.
The samples were stretched until crazing initiated, and then craze propagation
was monitored as a function of drawing speed and test temperature. The effect
of craze dimension on their propagation velocity was taken into account.
Three-dimensional birefringence profile for crazed polypropylene fibre has been
demonstrated to investigate the birefringence of crazed fibre at different test
times for fixed drawing speed value. Also the mean birefringence values of
crazed polypropylene fibres were calculated and the results showed that, these
values increased with the areal craze density. Video images were used to
calculate the craze velocity. Optical micrographs and microinterferograms were
presented for demonstrations.