NDLI: Acetylation of Xanthan Gum in Ionic Liquid

Content Provider	Springer Nature Link
Author	Endo, Ryo Setoyama, Miwa Yamamoto, Kazuya Kadokawa, Jun ichi
Copyright Year	2014
Abstract	In this paper, we report acetylation of xanthan gum using acetic anhydride in an ionic liquid solvent, 1-butyl-3-methylimidazolium chloride (BMIMCl). Xanthan gum was dissolved with BMIMCl [2 % (w/w)] and the reaction was carried out in the presence of acetic anhydride (five equiv. for hydroxy groups in a repeating unit) with stirring the solution at elevated temperatures. The structures of xanthan gum acetates were confirmed by the $^{1}$H NMR and IR spectra. The degree of acetylation (DA) values determined by the $^{1}$H NMR analysis increased with the higher reaction temperatures. The thermal gravimetric analysis (TGA) indicated the enhancement of thermal stability by acetylation. Furthermore, the TGA as well as differential scanning calorimetric (DSC) analysis of the products suggested the presence of the highly and less acetylated segments in a xanthan gum chain. The DSC profile of the product with the high DA value also exhibited a small endothermic peak, which might potentially be ascribed to the melting temperature.
Starting Page	199
Ending Page	205
Page Count	7
File Format	PDF
ISSN	15662543
Journal	Journal of Polymers and the Environment
Volume Number	23
Issue Number	2
e-ISSN	15728900
Language	English
Publisher	Springer US
Publisher Date	2014-09-24
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Xanthan gum Ionic liquid Acetylation Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Environmental Engineering Polymers and Plastics

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