摘要
通过微波法合成1-乙基-3-甲基咪唑磷酸二乙酯离子液体(EMIM-DEP)并用其溶解微晶纤维素。用偏光显微镜观察微晶纤维素在离子液体中的溶解。随温度的升高纤维素的溶解度增加,超声辅助可以很好地提高微晶纤维素在离子液体中的溶解度。溶解之后再生的纤维素通过红外光谱(FT-IR)、X-射线衍射(XRD)、扫描电镜(SEM)和热重分析(TGA)表征,结果显示微晶纤维素在EMIM-DEP中是直接溶解没有发生衍生反应;再生的纤维素晶型由纤维素Ⅰ型转化为纤维素Ⅱ型;回收后的离子液体结构没发生变化,重复利用仍保持较好的溶解微晶纤维素的能力。
1-Ethyl-3-methylimidazolium diethylphosphate （EMIM-DEP） is synthesized with microwave method and is used to dissolve microcrystalline cellulose in this study. Its dissolution process is observed by polarizing microscope. With the rise of temperature the solubility of cellulose increases. Ultrasonic auxiliary can improve well the solubility of mierocrystalline cellulose in ionic liquids. The regenerated cellulose is characterized by FT-IR, XRD, SEM and TGA. The resuhs show that the microcrystalline cellulose in EMIM-DEP is dissolved directly without derivative reaction. The regenerated cellulose is changed from cellulose I into cellulose I1 in crystal style. Recovered ionic liquid has no change in structure and can be reused with good dissolving ability for microcrystalline cellulose.
出处
《现代化工》
CAS
CSCD
北大核心
2012年第12期41-45,共5页
Modern Chemical Industry
关键词
离子液体
纤维素
溶解
超声辅助
ionic liquid
cellulose dissolution
ultrasonic auxiliary
