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Intrinsic Birefringence of γ‐Form Crystal of Nylon 6: Application to Orientation Development in High‐Speed Spun Fibers of Nylon 6
Author(s) -
Murase Shigemitsu,
Matsuda Tsunetoshi,
Hirami Matsuo
Publication year - 2001
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/1439-2054(20010101)286:1<48::aid-mame48>3.0.co;2-u
Subject(s) - birefringence , materials science , spinning , amorphous solid , fiber , crystal (programming language) , nylon 6 , phase (matter) , composite material , orientation (vector space) , synthetic fiber , crystallography , optics , polymer , organic chemistry , geometry , physics , programming language , mathematics , computer science , chemistry
The intrinsic birefringences of the α‐ and the γ‐form crystals of nylon 6 were calculated from the atomic coordinates and the bond polarizabilities using the Lorentz‐Lorenz equation. The intrinsic birefringence of the γ‐form crystal was found to be significantly smaller than that of the α‐form crystal. Those values were applied to the evaluation of the orientation function of the amorphous phase of the nylon 6 fibers produced by the high‐speed spinning process. The molecular orientation in the amorphous phase increased to the maximum point and then decreased with the spinning speed. These results suggested that an inhomogeneous structure in the fiber was formed for the higher take‐up speed.