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研究了细菌纤维素在N-甲基吗啉-N-氧化物的一水合物(NMMO·H2O)中的溶解性能,通过偏光显微分析(PM)、红外光谱分析(FT-IR)、X射线衍射分析(CRD)、热重分析(TG)等手段,表征了该溶剂体系获得的再生细菌纤维素膜的结构和性能。结果表明,该溶剂体系对细菌纤维素有良好的溶解性能,溶解过程以物理变化为主,溶解温度越高,再生后细菌纤维素的降解程度越大。且溶解后细菌纤维素晶型由纤维素Ⅰ型转变为纤维素Ⅱ型,但其热稳定性低于再生前细菌纤维素。
The solubility of bacterial cellulose in N-methylmorpholine-N-oxide monohydrate (NMMO · H2O) was studied by means of polarized light microscopy (PM), infrared spectroscopy (FT-IR) Ray diffraction (CRD) and thermogravimetric analysis (TG) were used to characterize the structure and properties of regenerated bacterial cellulose membranes obtained from this solvent system. The results showed that the solvent system had good solubility for bacterial cellulose. The dissolution process was dominated by physical changes. The higher the dissolution temperature, the greater the degradation of bacterial cellulose after regeneration. The bacterial cellulose crystal form was changed from cellulose Ⅰ to cellulose Ⅱ after lytic, but its thermal stability was lower than that of pre-regeneration bacterial cellulose.