期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 191, 期 -, 页码 100-107出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2021.09.070
关键词
Hydrothermal treatment; Acetylation; Delignification; Cellulose acetate; Polylactic acid
The article presents a simplified and green strategy for the synthesis of cellulose acetate, with greatly improved conversion rate and yield of the acetylated product achieved through hydrothermal treatment, resulting in significant enhancements in mechanical properties.
A simplified and green strategy was provided for the synthesis of cellulose acetate. Cellulose acetate (CA) was isolated from the directly acetylated eucalyptus powder after hydrothermal treatment to selectively remove hemicellulose without delignification. The conversion rate of cellulose (90.75%) and the yield of the acetylated product (61.34%) were greatly improved by hydrothermal treatment, while the re-condensation of lignin during hydrothermal treatment made no adverse difference. The characterization results verified that the acetylated product was cellulose acetate with uniform molecular weight, good thermal stability and semi-crystalline structure. Moreover, CA was used to reinforce polylactic acid (PLA) films prepared by solvent casting. The PLA-CA composite with 5 wt% CA showed an increase of 80.63% in tensile strength and 59.51% in Young's modulus, and their density decreased from 1.2427 g/cm(3) to 1.0028 g/cm(3). The lightweight and excellent mechanical properties promote the application potential of biodegradable composites to replace petroleum-based plastics.
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