Open AccessX-RAY STRUCTURAL ANALYSIS OF COTTONS AND HERBACEOUS CELLULOSE
Author(s) -
Kseniya Sergeyevna Momziakova,
Aleksey Aleksandrovich Shinkarev,
Т. Р. Дебердеев,
З Т Валишина,
А. А. Берлин,
Rustam Yakubovich Deberdeev
Publication year - 2021
Publication title -
himiâ rastitelʹnogo syrʹâ
Language(s) - English
Resource type - Journals
eISSN - 1029-5151
pISSN - 1029-5143
DOI - 10.14258/jcprm.2021038852
Subject(s) - cellulose , degree of polymerization , crystallite , crystallinity , materials science , hemicellulose , lignin , raw material , composite material , depolymerization , acid hydrolysis , crystallization , hydrolysis , polymerization , chemical engineering , polymer , polymer chemistry , chemistry , organic chemistry , metallurgy , engineering
It was found that the extrusion treatment of cotton cellulose in an aqueous medium, followed by drying and grinding on a hammer mill leads to a decrease in the crystallite size in the transverse direction ([110] and [100]) as a result of mechanical destruction of cellulose macromolecules, and the subsequent acid hydrolysis of cellulose in H2SO4 solutions to an increase in the size of crystallites in the transverse direction ([110], [110] and [100]) due to co-crystallization processes. It is shown that alkaline cooking of cellulose-containing material, followed by extrusion processing, washing, drying and grinding on a hammer mill leads to an increase in the transverse dimensions of crystallites in the [110] and [100] directions for flax cellulose and in the [110], [110] and [100] – for cellulose from oats and alfalfa as a result of partial removal of lignin and hemicelluloses from the cellulose-containing material.
Differences were revealed in the sizes of the coherent scattering regions and the parameters of the crystallographic cell of cellulose samples from cotton and herbaceous plants (flax, oats, and alfalfa), as well as between samples from oats and alfalfa obtained under the same conditions with the same type of feedstock (straw).
It has been established that the proposed stepwise technology for processing cotton and linen fibers leads to a slight decrease in the degree of crystallinity and the average degree of polymerization, which indicates that the developed technology for obtaining high-viscosity powder celluloses for various purposes is promising.
Correlation coefficients are established between the values of the degree of ordering of the structure of cellulose samples from various plant raw materials, calculated using X-ray diffraction analysis and FT-IR spectroscopy, which make it possible to adequately compare all the known literature and experimental data.