NDLI: Synthesis and characterization of cyanoethyl hemicelluloses and their hydrated products

Content Provider	Springer Nature Link
Author	Cao, Xuefei Sun, Shaoni Peng, Xinwen Zhong, Linxin Sun, Runcang
Copyright Year	2012
Abstract	A novel type of hemicellulosic derivative, cyanoethyl hemicelluloses (CEH), derived from xylan-rich hemicelluloses and acrylonitriles was successfully prepared in aqueous sodium hydroxide. The reaction was performed under various reaction conditions such as temperature, time, the amount of sodium hydroxide, and the molar ratio of acrylonitrile to anhydroxylose units in hemicelluloses, and the relationship between reaction condition and DS of the CEH was investigated in detail. A series of CEH with degree of substitution of cyanoethyl (DSC≡N) ranging from 0.23 to 1.64 were obtained. Importantly, CEH can undergo various reactions and convert into other macromolecules with functional groups like carboxylic acids, amine, aldehyde etc. In this work, H2O2/K2CO3/DMSO was used to hydrate CEH into carbamoylethyl hemicelluloses at room temperature. FT-IR, 1H and 13C NMR spectra confirmed the introduction of cyanoethyl groups into the hemicelluloses backbone and the presence of carbamoylethyl groups in the hydrated product. In addition, in the nucleophilic addition reaction, the hydroxyl groups at C-3 position of the anhydroxylose units were more active than these at C-2. TGA/DTG showed that CEH had lower thermal stability than hemicelluloses. This work provided a new macromolecule which can be used as a versatile platform for producing other functional macromolecules.
Starting Page	291
Ending Page	301
Page Count	11
File Format	PDF
ISSN	09690239
Journal	Cellulose
Volume Number	20
Issue Number	1
e-ISSN	1572882X
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-02-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hemicelluloses Acrylonitrile Cyanoethylation Bioorganic Chemistry Physical Chemistry Organic Chemistry Polymer Sciences Ceramics, Glass, Composites, Natural Materials Sustainable Development
Content Type	Text
Resource Type	Article
Subject	Polymers and Plastics

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