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Assessment of the intrinsic birefringence of partially oriented poly(ethylene terephthalate) yarns
Author(s) -
Garg Sunil K.
Publication year - 1982
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1982.070270812
Subject(s) - birefringence , materials science , rubber elasticity , poly ethylene , modulus , amorphous solid , composite material , shrinkage , young's modulus , elasticity (physics) , ethylene , natural rubber , elastic modulus , polymer chemistry , optics , crystallography , organic chemistry , physics , chemistry , catalysis
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 (Δ n c °) and amorphous (Δ n a °) 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: Δ n c ° = 0.22 and Δ n a ° = 0.19. The work was undertaken to resolve the discrepancy in the published literature values of these two parameters.