气相生长碳纤维/聚酰胺6纳米纤维增强聚乳酸复合材料

Vapor grown carbon fiber/polyamide 6 nanofibers reinforced polylactic acid composite

研究了气相生长碳纤维(VGCF)的表面功能化处理及其在聚合物中的分散性。通过静电纺丝,制备了不同VGCF含量的聚酰胺6(PA6)纳米纤维毡,并以VGCF/PA6纳米纤维增强聚乳酸(PLA)得到复合材料。研究发现,经过混酸处理的VGCF水溶液,在加入聚合物前后各用超声波处理1 h,VGCF的分散性较好;表面活性剂处理VGCF,明显提高了其在聚合物溶液中的分散效果。在PA6/甲酸溶液中加入VGCF后,纤维毡的力学性能增强,在纺丝液中VGCF质量分数为0.03%时,断裂强度达到最大值(14.68 MPa)。随着VGCF/PA6纳米纤维含量的增加,复合材料的断裂强度先增大后减小,并在VGCF/PA6质量分数为7.39%时达到峰值(25.80 MPa)。

The surface functionalization treatment of vapor grown carbon fiber （VGCF） and its dispersion in polymer were studied. The VGCF/polyamide 6 （PA6） nanofibrous mats with different contents of VGCF were prepared by electrospinning, and then VGCF/PA6 nanofibers reinforced polylactic acid （PLA） composite was obtained by hot pressing. The resuhs indicated that, VGCF treated with mixed acid presented a better dispersion in polymer solution when the VGCF solution was ultrasonically treated for 1 h before and after the addition of polymer. With surfactant treatment, the dispersion of the acidtreated VGCF in the polymer solution was obviously improved. With the addition of VGCF into the PA6/ formic acid spinning solution, the mechanical properties of the fiber mats were improved. When the mass fraction of VGCF in the spinning solution was 0.03% , the breaking strength of VGCF/PA6 nanofibers reached the maximum value （14.68 MPa）. The breaking strength of composites increased at first and then decreased with increase of the content of VGCF/PA6 nanofibers in the composites, and the peak value （25.80 MPa） appeared as the mass fraction of VGCF/PA6 nanofibers reached 7.39%.