A morpholinium ionic liquid for cellulose dissolution

作者：Raut Dilip G^*; Sundman Ola; Su Weiqing; Virtanen Pasi; Sugano Yasuhito; Kordas Krisztian; Mikkola Jyri Pekka

来源：Carbohydrate Polymers, 2015, 130: 18-25.

DOI：10.1016/j.carbpol.2015.04.032

• Cellulose
• Dissolution
• Ionic liquid
• Morpholinium
• Allyl
• Acetate

A series of substituted morpholinium ionic salts and allyl ammonium acetates were prepared. Amongst those, N-allyl-N-methylmorpholinium acetate ([AMMorp][OAc]) was found to dissolve cellulose readily without any pre-processing of native cellulose. At 120 degrees C, [AMMorp][OAc] could dissolve 30 wt%, 28 wt% and 25 wt% of cellulose with degree of polymerization (DPn) - 789, 1644 and 2082 respectively, in 20 min. Importantly, SEC analysis indicated that no discernible changes occurred in terms of the degree of polymerization of the different celluloses after regeneration. Furthermore, when comparing the cellulose dissolution capability of these newly synthesized ionic liquids, it is evident that the combination of all three constituents - the morpholinium cation, the existence of an allyl group and choosing the acetate anion are essential for efficient cellulose dissolution. The structure and morphology of the regenerated cellulosic materials were characterized by SEM, XRD, TGA, CP/MAS C-13 NMR and FTIR, respectively.

• 出版日期2015-10-5