IJMS, Vol. 18, Pages 2502: Ionic Liquid-Mediated Homogeneous Esterification of Cinnamic Anhydride to Xylans

IJMS, Vol. 18, Pages 2502: Ionic Liquid-Mediated Homogeneous Esterification of Cinnamic Anhydride to Xylans

International Journal of Molecular Sciences doi: 10.3390/ijms18122502

Authors:Guihua YangHuifang ZhouJiachuan ChenGaojin LyuYuanyuan XiaLucian Lucia

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.

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