Microstructure Organization in Para-aramid Fibers

摘要

The existence of "lateral birefringence," i.e., the difference between the refractive index for light polarized parallel to the fiber radius and light polarized perpendicular to the radius in the cross-sectional plane, combined with the existence of electron diffraction contrast "bands" in longitudinal fiber sections has led to work appearing to indicate that para-aramid fibers, in particular poly (para-phenylene terephthalamide), have an almost crystallographically perfect orthotropic structure in which the hydrogen bonds are all parallel to fiber radii.