Premium
Measurement of amorphous orientation in poly(ethylene terephthalate) fibers by X‐ray diffraction and its significance
Author(s) -
Murthy N. S.,
Bednarczyk C.,
Rim P. B.,
Nelson C. J.
Publication year - 1997
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/(sici)1097-4628(19970516)64:7<1363::aid-app16>3.0.co;2-y
Subject(s) - tenacity (mineralogy) , amorphous solid , birefringence , materials science , composite material , anisotropy , isotropy , diffraction , phase (matter) , modulus , orientation (vector space) , small angle x ray scattering , scattering , synthetic fiber , fiber , crystallography , optics , geometry , physics , chemistry , organic chemistry , mathematics
The orientation of the noncrystalline (amorphous) phase in poly(ethylene terephthalate) fibers is analyzed by separating the amorphous scattering in the wide‐angle x‐ray diffraction patterns into isotropic and anisotropic components. Two parameters are used to characterize the amorphous orientation—the fraction of the anisotropic component and its degree of orientation. The x‐ray amorphous orientation parameters are compared with the sonic modulus and the birefringence values. Our results illustrate that the intrinsic birefringence of the amorphous phase is not “intrinsic” but depends on its density. The role of the oriented amorphous phase in determining the strength (tenacity) and the dimensional stability (shrinkage) of the fibers is discussed. We conclude that although amorphous orientation determines the shrinkage, other factors such as the connectivity between the amorphous phase and the crystalline regions play an important role in determining the tenacity of the fibers. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 64: 1363–1371, 1997