Библиографическое описание:Crystallization and water cast film formability of birchwood xylans : научное издание / M. M. Zhang [et al.]. - Текст : непосредственный // Cellulose. - 2023. - Т.30, №7. - P. 4623-4638. - ISSN 0969-0239. - ISSN 1572-882X, DOI 10.1007/s10570-023-05147-2.
Аннотация:The most promising application of xylans is as coating agents. The basis of a xylan coating is to form a water cast film on a substrate, and the performance of the film would affect the quality of coatings. The film formability and film mechanical properties of xylans greatly depend on the plant sources, isolation methods and the crystallization of xylans, but general rules have not been systematically summarized. In this study, sequential alkali extraction and graded ethanol precipitation methods were used to extract xylans from birchwood or its holocelluloses to obtain xylans with different chemical structures. The effects of chemical structures on the crystallization property and film formability of birchwood xylans were investigated. Different from the arabinose side chains in bagasse xylans, glucuronic acid side chains do not affect the crystallinity of birchwood xylans simply by the degree of substitution. The carboxyls of glucuronic acid shifting between salt/acid forms exert unique effects on the crystallinity of xylans. Excessive aggregation of xylan molecules resulting in high residual compressive stresses is the cause for inferior film formability. Lignin can act as an impurity to prevent xylan aggregation and high lignin content would be beneficial to the xylan film formation.
Издательство:Springer Science+Business Media B.V., Formerly Kluwer Academic Publishers B.V.
Источник:Cellulose
Выпуск:Т.30, №7
Номера страниц:4623-4638
Держатель оригинала документа:Institute of Chemistry and Chemical Technology, Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences, Professor V.F. Voino-Yasenetsky Krasnoyarsk State Medical University of the Ministry of Healthcare of the Russian Federation, Siberian Federal University, State Key Laboratory of Pulp and Paper Engineering, South China University of Technology
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