中文摘要：

采用静电纺丝法制备出了纳米级、亚微米级纤维，采用尖角圆盘收集成具有定向排列的单向纤维束，考察了圆盘转速对纤维定向性的影响。为提高纤维的强度和模量，对收集到的纤维束进行了热处理、拉伸、加捻、定型等后处理工艺，再将多股定型的纤维束编织成线。研究了上述工艺参数对纤维束力学性能的影响，选取最佳工艺参数编织纤维束，并研究了编织线的力学性能。良好的性能预示其在纺织、生物医学等领域具有潜在的应用前景。

英文摘要：

PU nanofibers were fabricated by means of eleetrospinning and were collected undireetionally using a rotating disk. The relationship between a rotating speed and fiber alignment was studied. The collected fiber bundles were post process- ing treated using the techniques such as heating, stretching, twisting, and prefonning, before they were made into a braided wire. Optimal post processing parameters were obtained in order to achieve the highest mechanical properties for the fiber bundles. It was shown that the braided wires had a much better mechanical performance than that of the unidi- rectionally collected fiber bundles before the post treatments, and even better than that after the treatments. This high mechanical behavior implies that the braided wires based on aligned electrospun nanofibers will have potential applications in textile and biomedical fields. Key words： nanofiber, electrospinning, alignment, braiding, mechanical characterization