中文摘要：

采用电驱动纺丝，以壳聚糖（CTS）为研究对象材料，通过引入超高分子量聚氧化乙烯（PEO）调节纺丝液的黏弹性，实现抑制电纺丝固有的射流不稳定弯曲摆动来得到单一的稳定射流，从而可以像传统工业上的干、湿法纺丝一样制备定向的超细CTS纤维（称为稳定射流电纺丝，SJES）．系统地研究了SJES的工艺参数（如CTS／PEO质量比、纺丝电压、接收距离、凝固浴成分、辊筒转速等）对制备定向的超细壳聚糖纤维的影响，并通过SEM、FTIR、WAXD、纳米力学拉伸仪等研究了所制备纤维的形貌、结构与性能．结果表明，SJES法制备的CTS纤维直径在10μm以下，优化参数（如电压和辊筒转速）可使纤维直径细化到3μm左右．纤维单丝具有较高的力学性能，断裂强度和纤维模量可以分别达到（762±93）MPa和（11±6）GPa．稳定射流电纺丝方法制备的超细纤维与常规电纺丝法制备的纤维相比，具有较高的微晶取向度．

英文摘要：

Using chitosan （CTS） as a model polymer,the feasibility of obtaining aligned uhrafine CTS fibers were demonstrated by employing a small amount of ultrahigh molecular weight poly （ ethylene oxide） （PEO） to formulate the solution viscoelasticity,which enables to suppress the electrospinning bending instability to form a pretty long and stable jet （this approach was termed as ＂ stable jet electrospinning＂, SJES）. This makes continuous fabrication of aligned uhrafine fibers, as achievable in those traditional fiber forming methods （e. g. , dry spinning or dry-wet spinning） , to come into reality. Here, a systematical parameter study is reported on the SJES process including mass ratio of CTS/PEO, applied voltage, collecting distance, coagulation bath and rotating speed of drum. Characterization of the resultant electrospun CTS fibers by SEM,FTIR,WAXD and nano-tensile testing was also performed. The result showed that SJES enabled to produce individual CTS fibers with a diameter of 〈 10 μm. The diameters of CTS fibers could be attenuated to ca. 3 μm by varying applied voltage and stretching speed. The electrospun CTS fibers by SJES were of high mechanical performance, with the measured tensile strength and modulus of （762 ± 93 ） MPa and （ 11 ± 6） GPa, respectively. SJES facilitated polymer chain and crystalline orientation, which may have contributed to the significant improvement in the mechanical properties of thus made ultrafine CTS fibers.