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Int. J. Mol. Sci. 2017, 18(12), 2502; doi:10.3390/ijms18122502

Ionic Liquid-Mediated Homogeneous Esterification of Cinnamic Anhydride to Xylans

Key Lab of Pulp & Paper Science and Technology of the Ministry of Education, Qilu University of Technology, Jinan 250353, China
Departments of Chemistry, Wood & Paper Science (Forest Biomaterials), North Carolina State University, Raleigh, NC 27695-8005, USA
Authors to whom correspondence should be addressed.
Received: 3 November 2017 / Revised: 20 November 2017 / Accepted: 21 November 2017 / Published: 23 November 2017
(This article belongs to the Special Issue Ionic Liquids 2018 and Selected Papers from ILMAT IV)
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A new functional biopolymer was synthesized through an ionic liquid-mediated homogeneous grafting of cinnamic anhydride to xylans. The ionic liquid used was 1-allyl-3-methylimidazolium chloride (AMIMCl) ionic liquid. Xylans with degrees of substitution (DS) between 0.11 and 0.57 were accessible in a completely homogeneous system by changing catalysts (NaOH, KOH and LiOH), time, reaction temperature, and cinnamic anhydride/xylan molar ratio. The chemical structure and the thermal stability of the derivatives were characterized by Fourier transform infrared spectroscopy (FT-IR), 13C-NMR spectroscopy, and thermogravimetry. The thermal stability of the derivatives was reduced compared with the original xylan. Possible applications of the cinnamic anhydride-acylated xylan derivatives include wet-end papermaking, organic–inorganic composite films, and hydrogels. View Full-Text
Keywords: homogeneous esterification; xylan; cinnamic anhydride; ionic liquids; functionalization; degrees of substitution homogeneous esterification; xylan; cinnamic anhydride; ionic liquids; functionalization; degrees of substitution

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yang, G.; Zhou, H.; Chen, J.; Lyu, G.; Xia, Y.; Lucia, L.A. Ionic Liquid-Mediated Homogeneous Esterification of Cinnamic Anhydride to Xylans. Int. J. Mol. Sci. 2017, 18, 2502.

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