Birefringence and orientation parameters of cold-drawn viscose fibers

✍ Scribed by I. M. Fouda; E. A. Seisa

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 319 KB
• Volume: 106
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.26849

✦ Synopsis

Abstract

This study was carried out by two beam polarizing interference Pluta microscope to obtain changes undrawn viscose fibers. Application of the appropriate mathematical equations indicates that the refractive indices in the direction of the drawing force increase with increasing the draw ratio and decrease in the perpendicular direction. The changes in the draw ratio were evaluated to obtain the shrinkage stress, the mechanical function factors 〈P~2~(cos θ)〉 and 〈P~4~(cos θ)〉, the average work per chain W′ for a collection of chains, and the average mechanical orientation. The optical results were to obtain the three optical orientation functions, the dielectric constant and the dielectric susceptibility and the average orientation function. Also calculation of the intrinsic crystalline
$ \Delta n_c^o $
and amorphous $ \Delta n_a^o $
birefringence. Evaluation of another opto‐mechanical parameters were given, too. An empirical formula was suggested to evaluate the relationship between the draw ratio and some determined opto mechanical parameters. Illustrations using microinterferogram, graphs, and tables are given. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007