Advance in solvents of cellulose was summarized in this article.N-Methylmorpholine-N-oxide(NMMO) could break the intermolecular hydrogen-bonds of cellulose at the temperature higher than 85℃
leading to the dissolution.Lithium chloride/N
N-dimethylacetamide(LiCl/DMAc) were able to dissolve cellulose at 100℃ or higher.Ionic liquids such as 1-allyl-3-methylimidazolium chloride and 1-butyl-3-methylimidazolium chloride could dissolve cellulose
as a result of the strong hydrogen-bond acceptor(Cl-)
which could associate with hydroxyl of cellulose.In carbamate system
cellulose derivate reacted with urea could be dissolved in NaOH aqueous solution.NaOH/H
2
O can only dissolve cellulose with low crystalline and degree of polymerization.Interestingly
cellulose could be dissolved rapidly in NaOH/urea
NaOH/thiourea and LiOH/urea aqueous systems pre-cooled to-5~-12℃.New hydrogen-bonded network structure between solvent and cellulose macromolecules could form to destroy the inter-and intramolecular hydrogen-bonds of cellulose.The inclusion complex hosted by urea or thiourea reduced the self-association of cellulose chains
leading to the good dispersion of cellulose.Low temperature dissolution is a great breakthrough to the traditional dissolving method
and also a strong driver force of the green chemistry.50 References were cited.
关键词
纤维素溶剂溶解机理纤维氢键
Keywords
Solvent of celluloseDissolution mechanismFiberHydrogen-bond