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Structure of fibrous cellulose acetate: X‐ray diffraction, positron annihilation and electron microscopy investigations
Author(s) -
Doyle Stephen E.,
Pethrick Richard A.
Publication year - 1987
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.1987.070330109
Subject(s) - crystallite , positron annihilation , crystallography , electron microscope , materials science , microcrystalline , diffraction , breakup , fibril , microcrystalline cellulose , annihilation , fiber , microscopy , x ray crystallography , scanning electron microscope , cellulose , chemistry , positron , electron , composite material , optics , physics , organic chemistry , biochemistry , quantum mechanics , mechanics
X‐ray diffraction, positron annihilation, electron microscopy and bulk density measurements are reported as a function of the degree of acetylation for a linters cotton. Heterogeneous reaction proceeds with a retention of ordered structure in the fibers. Substitution does increase the extent of disorder but is not sufficiently extensive to disrupt completely order at the fiber, fibril, micro fibril, and crystallite levels. The generation of disorder is associated with an increase in the interfibrillar distance, a breakup of the microfibrillar structure without a total disruption of the microcrystalline structure.