Journal
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
Volume 15, Issue 4, Pages 554-560Publisher
UNIV FED SAO CARLOS, DEPT ENGENHARIA MATERIALS
DOI: 10.1590/S1516-14392012005000076
Keywords
polyethylene terephthalate; hot multistage drawing; orientation; mechanical and optical orientation functions
Categories
Funding
- Islamic Azad University, Birjand Branch
Ask authors/readers for more resources
In this work, mechanical and structural parameters related to the optical properties of polyethylene terephthalate (PET) fibers drawn at hot multistage have been investigated. The changes in optical parameters upon changing draw ratio are used to obtain the mechanical orientation factors and , various orientation functions f(2)(theta), f(4)(theta) and f(6)(theta), and amorphous and crystalline orientation functions (f(a) and f(c)). Also, the numbers of random links between the network junction points (N-1), the average optical orientation (F-av), and the distribution function of segment omega(cos theta) were calculated. In addition, an empirical formula was suggested to correlate changes in the birefringence with the draw ratio and its constants were determined. The study demonstrated change on the molecular orientation functions and structural parameters upon hot multistage drawing. Significant variations in the characteristic properties of the drawn PET fibers were due to reorientation of the molecules caused by applied heat and external tension.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available