Assessment of the intrinsic birefringence of partially oriented poly(ethylene terephthalate) yarns
Article first published online: 9 MAR 2003
Copyright © 1982 John Wiley & Sons, Inc.
Journal of Applied Polymer Science
Volume 27, Issue 8, pages 2857–2867, August 1982
How to Cite
Garg, S. K. (1982), Assessment of the intrinsic birefringence of partially oriented poly(ethylene terephthalate) yarns. J. Appl. Polym. Sci., 27: 2857–2867. doi: 10.1002/app.1982.070270812
- Issue published online: 9 MAR 2003
- Article first published online: 9 MAR 2003
- Manuscript Accepted: 18 JAN 1982
- Manuscript Received: 18 NOV 1981
Partially oriented poly(ethylene terephthalate) yarns (PET POY) have been studied with respect to their birefringence, sonic modulus, and stress-optical properties in an effort to extract the values for the intrinsic birefringences of the crystalline (Δnc°) and amorphous (Δna°) regions. The data have been analyzed within the framework of both the sonic modulus-birefringence treatment of Samuels and Dumbleton, and the Gaussian rubber elasticity theory using the usual shrinkage stress-birefringence relations. The following values have been determined: Δnc° = 0.22 and Δna° = 0.19. The work was undertaken to resolve the discrepancy in the published literature values of these two parameters.