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Small‐angle X‐ray scattering of aramid fibre
Author(s) -
Aerts J.
Publication year - 1991
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889890012730
Subject(s) - small angle x ray scattering , scattering , materials science , protein filament , aramid , composite material , phase (matter) , crystallography , optics , fiber , chemistry , physics , organic chemistry
Aramid fibres show elongated microvoids parallel to the direction of the fibre axis, resulting in an equatorial streak in the small‐angle X‐ray scattering (SAXS) pattern. The scattered intensity in the equatorial direction has been measured for three samples of the same fibre: an untreated yarn specimen, yarn in which Ag 2 S was precipitated and a single filament of the latter. In the case of the untreated yarn, the interpretation of the SAXS pattern is hindered by the presence of residual water in the voids, resulting in a three‐phase system. The SAXS pattern of the yarn with precipitated Ag 2 S follows the theoretical pattern (adapted for the two‐dimensional case) for a system with random pores, but the interface between aramid and Ag 2 S shows fractal properties. The single filament with Ag 2 S shows a SAXS pattern analogous to that of the fibre with Ag 2 S, indicating that multiple scattering and interfilament scattering is negligible. It was also found that the Ag 2 S precipitates in the fibre with preferred orientation.