Polyamide 6 (PA6) nanofibers were prepared by removing LDPE matrix from PA6/low-density polyethylene/maleic anhydride-grafted polyethylene (PA6/LDPE/PE-g-MAH) blend fibers via sea island bicomponent spinning process. The effects of blend composition and spinning conditions on the phase structure, crystallization and mechanical properties of the blend fibers and the diameter of PA 6 nanofibers were studied. The results showed that the diameter of PA6 nanofibers gradually increased with the increase of PA6 dispersed phase content; the average diameter of PA6 nanofibers rose to 149 run from 107 nm when the mass fraction of PA6 was increased to 60% from 30% ; PA6 nanofibers cannot be prepared due to the phase inversion when the mass fraction of PA6 was 70% ; and the diameter of PA6 nanofibers was further decreased, but the crystallinity and mechanical properties were improved with the increase of draw ratio when the mass fraction of PA6 was 55%.%采用共混海岛纺丝法制备聚酰胺6/低密度聚乙烯/聚乙烯接枝马来酸酐(PA6/LDPE/PE-g-MAH)共混纤维,溶解剥离出LDPE基体相,可制备出PA6纳米纤维；研究了共混物的组成和纺丝条件对共混纤维的相结构、结晶、力学性能及PA6纳米纤维直径的影响.结果表明:随着共混物中PA6分散相含量增加,PA6纳米纤维的直径逐渐增大；PA6质量分数从30％增加至60％时,PA6纳米纤维平均直径由107 nm增至149nm；PA6质量分数为70％时,由于相逆转无法得到PA6纳米纤维；在PA6质量分数为55％条件下,提高拉伸倍数,PA6纳米纤维的直径进一步降低,且结晶度、力学性能增加.
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