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Small‐angle X‐ray scattering of cellulose. I. Shape and extent of scattering in some vegetable fibers
Author(s) -
Roy S. C.,
Das S.
Publication year - 1965
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/app.1965.070091020
Subject(s) - scattering , ramie , materials science , small angle x ray scattering , fiber , optics , composite material , spiral (railway) , physics , mathematics , mathematical analysis
It was shown that the shape of the scattering pattern is not only related to the shape but also to the face‐orientation of the lamellar scattering units, and an actual observation of its characteristic shape depends on the amount and dispersion of their spiral angle. The following results were obtained: ( 1 ) For observing a cross‐pattern, the critical spiral angles corresponding to minimum and maximum dispersions are 7.5° and 30° respectively, whereas in an actual fiber, coir, the critical angle is about 16.75°. ( 2 ) The jute pattern changes from a uniformly narrow to a triangular shape on disorientation and reverts to the former on reorientation. The corresponding changes in ramie are from a triangular to a uniformly wide and then to a uniformly narrow shape. Both native and disoriented cottons give weak, fan‐shaped scattering superimposed on a more intense elliptical pattern. The pattern given by reoriented cotton is roughly a narrow streak. Delignified jute gives a somewhat shaving‐brush‐shaped pattern which changes to a uniformly wide streak on alkali treatment. ( 3 ) The extent of scattering decreases on swelling and increases on stretching in jute, ramie, and cotton, but decreases in stretched coir.