两种离子液体中制备再生棉浆纤维素膜及其性能研究

Dissolution and regeneration membrane of cellulose in ionic liquid

以1-丁基-3-甲基咪唑氯盐([Bmim]Cl)和1-乙基-3-甲基咪唑醋酸盐([Emim]Ac)两种离子液体作为棉浆粕的溶解体系,并制备了再生棉浆粕纤维素膜,采用红外光谱、X射线衍射、热重分析、扫描电镜和质构仪对棉浆再生前后纤维素膜进行结构表征。结果表明,将棉浆直接溶解在离子液体中,再生后纤维素晶型由Ⅰ型向Ⅱ型的晶型转变,热稳定性略有下降。再生纤维素膜结构致密均匀,力学性能优异,在[Bmim]Cl和[Emim]Ac中拉伸强度分别可达94.55MPa和39.15MPa。

Cotton pulp was dissolved in ionic liquids [Bmim]CI and [Emim]Ac and regenerated membrane was successfully prepared. Its dissolution process was observed by polarizing microscope. The structural differences between cotton pulp and regenerated cellulose membrane were investigated using Fourier transform infrared （FT-IR） spectroscopy,X-ray diffraction and thermogravimetry（TG） measurements. The results showed that cotton pulp was directly dissolved by ionic liquids and its crystalline form transformed from cellulose I to cellulose II. The regenerated cellulose membranes obtained showed a dense and smooth structure and displayed a slight thermal stability loss. The tensile strength could be up to 94.55MPa and 39.15MPa from [Bmim]CI and [Emim]Ac,respectively.