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采用溶液喷射纺丝技术制备间位芳纶/多壁碳纳米管(PMIA/MWNTs)纳米纤维,探讨了不同工艺参数下纳米纤维表观形貌和直径分布的变化,研究了MWNTs对PMIA纳米纤维膜结晶性能和力学性能的影响。结果表明:在拉伸风压为0.12 MPa、喷丝孔内径为0.4~0.5 mm时,可以制得形貌较好的PMIA/MWNTs纳米纤维;随MWNTs负载量的增加,制得纳米纤维的平均直径变粗,结晶度变大,纤维膜拉伸强度增大,断裂伸长率则下降;MWNTs的最佳负载量为0.3%,此时可制得形貌结构均匀,直径较细的PMIA/MWNTs纳米纤维,纤维平均直径为372 nm,纤维膜拉伸强度达到41.85 MPa,较纯PMIA纳米纤维膜提高了86%以上。
The preparation of meta-aramid / multi-walled carbon nanotubes (PMIA / MWNTs) nanofibers by solution jet spinning was studied. The changes of apparent morphology and diameter distribution of nanofibers under different process parameters were investigated. Film crystallization and mechanical properties of the impact. The results show that the morphology of PMIA / MWNTs nanofibers can be obtained at the stretching pressure of 0.12 MPa and the inner diameter of the spinneret of 0.4-0.5 mm. With the increase of MWNTs loading, the average of nanofibers obtained The diameter increases, the degree of crystallinity becomes larger, the tensile strength of the fiber membrane increases and the elongation at break decreases. The optimal load of MWNTs is 0.3%. At this time, the morphology and the diameter of the PMIA / MWNTs nanofibers with an average fiber diameter of 372 nm and a tensile strength of 41.85 MPa were obtained, which was more than 86% higher than pure PMIA nanofibers.