离子液体[bmim]Cl对甘蔗渣中纤维素的溶解与再生

Dissolution and regeneration of cellulose in sugarcane bagasse from ionic liquid [bmim]Cl

研究了利用离子液体1-丁基-3-甲基咪唑氯盐([bmim]Cl)对甘蔗渣中的纤维素直接溶解并再生,考察了温度、NaOH浓度以及溶解时间对溶解率的影响,同时分别通过FT-IR、X射线衍射及热失重对再生纤维素的结构、结晶性及热性能进行了研究。实验表明:温度80℃、NaOH浓度为1%、溶解时间为1.5 h时,离子液体[bmim]Cl对甘蔗渣有最好的溶解性,溶解率可达到48%。离子液体主要溶解甘蔗渣中的纤维素,且为非衍生化的直接溶解,再生后的纤维素结晶形态由纤维素Ⅰ变为Ⅱ,热稳定性能同纯纤维素相比有所降低。

1-Butyl-3-methylimidazolium chloride（[bmim]Cl）was used to dissolve cellulose in sugarcane bagasse and cellulose regeneration.Influence of temperature,NaOH concentration and time on the dissolution of cellulose in sugarcane bagasse was investigated.The regenerated cellulose from ionic liquid（IL）was characterized using X-ray diffraction,FT-IR spectroscopy and TGA.Results showed that [bmim]Cl is a good solvent for cellulose and at optimal conditions of 80℃ for 90min with 1% NaOH solution for cellulose activation,by which 48% of dissolution rate of cellulose was achieved.It was also observed that [bmim]Cl is a non-detribalizing solvent for cellulose.The regenerated cellulose from IL showed a crystalline form of cellulose II and was less thermally stable than pure cellulose.