Dissolution and regeneration behavior of chitosan in 3-methyl-1-(ethylacetyl)imidazolium chloride

详细信息    查看全文

• 作者：Bin Xu ; Qiaoping Li ; Linghua Zhuang ; Qiang Wang ; Chao Li…
• 关键词：Ionic liquids ; Chitosan ; Dissolution ; Regeneration ; Molecular simulation
• 刊名：Fibers and Polymers
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：17
• 期：11
• 页码：1741-1748
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Polymer Sciences;
• 出版者：The Korean Fiber Society
• ISSN：1875-0052
• 卷排序：17

文摘

3-methyl-1-(ethylacetyl)imidazolium chloride ([EtMIM]Cl), was synthesized for chitosan dissolution, and the dissolution and regeneration behaviors of chitosan in [EtMIM]Cl were thoroughly investigated. The solubility of chitosan in [EtMIM]Cl was measured at temperatures ranging from 40 °C to 110 °C, based on which the thermodynamic parameters of chitosan in [EtMIM]Cl were calculated. The polarizability and hydrogen bond accepting ability was determined by solvatochromic UV/vis spectroscopy. The regenerated chitosan from [EtMIM]Cl by adding methanol was characterized by thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Density functional theory (DFT) computations were performed to study the interactions between [EtMIM]Cl and chitobiose. Five kinds of hydrogen bonds, C-H/O, O-H/O, O-H/Cl, C-H/Cl, N-H/Cl were found, suggesting strong interactions between [EtMIM]Cl and chitobiose. In particular, the oxygen atom and the active methylene group of carboxylic ester in [EtMIM]+, formed strong hydrogen bonding with chitobiose. The molecular simulation results indicated that both the Cl− anions and [EtMIM]+ cation played important roles in the chitosan dissolution process, by the disruption of native hydrogen bonds of chitosan.