【摘要】 通过干湿法纺丝工艺制备了间位芳纶，探究了成形过程中湿热拉伸与干热拉伸对间位芳纶纤维性能与结构的影响。结果表明：在湿热拉伸和干热拉伸中，湿热拉伸对纤维的线密度影响更大，可以通过改变湿热拉伸倍数有效调控纤维的线密度。当湿/干热拉伸比接近于1时，纤维获得最高的断裂强度（4.68 cN/dtex）、适中的断裂伸长率（35.8%）、最低的热收缩率（0.76）和最高的取向度，说明在纤维成形过程中，过高的湿热拉伸和过高的干热拉伸都不利于纤维获得更规整的结构和更优良的机械性能，须平衡湿/干热拉伸比，以充分结合两个拉伸阶段的优势。随着湿/干热拉伸比的增加，纤维中溶剂残留量逐渐增加，会影响纤维的后续应用，应尽量避免。更多还原

【Abstract】 Poly(m-phenylene isophalamide)(PMIA) is prepared by the dry-jet-wet-spinning process. The effects of wet-heat stretching and dry-heat stretching on the properties and structure of PMIA fibers during the forming process are investigated. The results show that in both wet-heat stretching and dry-heat stretching process, wet-heat stretching has higher impact on the linear density/of the fibers. The linear density of the fibers could be effectively controlled by changing the wet-heat stretching ratio. When the wetdry/heat stretching ratio is close to 1, the fibers obtain the highest breaking strength(4.68 cNdtex), moderate breaking elongation rate(35.8%), the lowest thermal shrinkage rate(0.76), and the highest orientation degree. This indicates that in the fiber forming process, excessive wet-heat stretching and excessive dry-heat stretching are not conducive to obtaining a more regular structure and/better mechanical properties for the fibers. It is necessary to balance the wetdry heat stretching ratio to fully combine the advantages of/the two stretching stages. As the wetdry heat stretching ratio increases, the residual solvent content in the fibers gradually increases,resulting in an adverse effect on the subsequent application of the fibers, therefore it should be avoided as much as possible.更多还原