离子液体法制备再生细菌纤维素纤维

以离子液体(氯化1-甲基-3-正丁基咪唑)溶解高聚合度细菌纤维素(BC),采用湿法纺丝制备再生细菌纤维素(RBC)初生纤维；通过红外光谱分析(FTIR)、广角X射线衍射(WAXD)分析、热失重(TG)分析、扫描电镜( SEM)、单丝强度拉伸等表征了RBC初生纤维的结构和性能.结果表明:该溶剂体系通过10 h的快速搅拌溶...

Preparation of regenerated bacterial cellulose nascent fibers prepared by ionic liquid process

Bacterial cellulose(BC) with high polymerization degree was dissolved in the ionic liquid of l-N-butyl-3-methylimidazolium chloride and was spun into regenerated bacterial cellulose(RBC) nascent fiber by wet spinning process.The structure and properties of RBC nascent fiber were characterized by Fourier transform infrared spectrometry(FTIR),wide-angle X-ray diffraction (WAXD),thermogrametric analysis(TGA),scanning electron microscopy(SEM),single fiber tensile strength test. The results showed that BC can be completely dissolved in the solvent system after 10-h high-speed stirring,which is dominantly a physical process without yielding any derivatives;the crystal form of RBC nascent fiber was transformed from cellulose crystalⅠto II,the crystallinity significantly decreased,the breaking strength was increased within the range of 0.54 - 1.36 cN/dtex while decreasing coagulation bath temperature,and the addition of anhydrous alcohol in coagulation bath was helpful to improving the fiber strength;the thermal stability of RBC nascent fiber slightly dropped as compared with that of BC;and RBC nascent fiber had rough surface with vertical and horizontal grooves,thin sheath and compacted core containing a small quantity of microholes.