Тип публикации: статья из журнала
Год издания: 2023
Идентификатор DOI: 10.1007/s10570-023-05147-2
Ключевые слова: xylan, crystallization, Film formability, glucuronic acid, lignin
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 cПоказать полностьюrystallization 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.
Журнал: Cellulose
Выпуск журнала: Т.30, №7
Номера страниц: 4623-4638
ISSN журнала: 09690239
Издатель: Springer Science+Business Media B.V., Formerly Kluwer Academic Publishers B.V.