Journal
CARBOHYDRATE POLYMERS
Volume 130, Issue -, Pages 325-332Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2015.05.014
Keywords
Chitosan; 2,3-Epoxypropyltrimethyl ammonium chloride; AmimCl; Homogeneous reaction; N-[(2-Hydroxyl)-propyl-3-trimethyl ammonium] chitosan chloride
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Funding
- National Natural Science Foundation of China [21306092, 21376125]
- Science and Technology Plan Project of Shandong Provincial University [J12LA02]
- Program for Scientific Research Innovation Team in Colleges and Universities of Shandong Province
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N-[(2-Hydroxyl)-propyl-3-trimethyl ammonium] chitosan chloride (HTCC) was synthesized through nucleophilic substitution of 2,3-epoxypropyltrimethyl ammonium chloride (EPTAC) onto chitosan using ionic liquid of 1-allyl-3-methylimidazole chloride (AmimCl) as a homogeneous and green reaction media. The chemical structure of HTCC was confirmed by FTIR, H-1 NMR and C-13 NMR. The FTIR peak intensity of amino group at 1595 cm(-1) decreased and that of -N(CH3)(3)(+) at 1475 cm(-1) increased with the increase of reaction time, confirming the substitution of EPTAC on CS. The degree of substitutions (DS) were calculated from the integral area of H-1 NMR, and the optimum reaction condition was obtained, namely, reaction time of 8 h, temperature of 80 degrees C and n(EPTAC)/n(-NH2), of 3/1. The degree of crystallinity and thermal properties of HTCC were characterized by XRD, TG, DSC, and DMA methods. Data from XRD, TG, DSC and DMA show that the degree of crystallinity, thermal stability, as well as glass transition temperature of HTCC decreased with the increase of DS. The reaction mechanism of chitosan with EPTAC in AmimCl was elucidated by performing density functional theory (DFT) calculations. (C) 2015 Elsevier Ltd. All rights reserved.
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