[섬유] Microstructure Organization in Para-aramid Fibers 출판일 : 2000.11.01 저자 : Hawthorne Davis, James Singletary, Mohan Srinivasarao, Warren Knoff, and M.K. Ramasubramanian 서지사항 : Textile Research Journal, Volume 70, Issue 11, 945페이지 등록일 : 2012.10.22 I 조회수 : 54 작성자 : admin |
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. Optical path difference profiles, calculated based on the proposed orthotropic
structure, are in reasonable qualitative agreement with interference microscope data.
Quantitatively, however, the orthotropic structure is only partially developed based on
published values of the principle refractive indices. Furthermore, the degree to which this
structure is developed varies with distance from the fiber axis in some fibers' types.
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