碳纳米管增强PA6纤维的性能

将碳纳米管(CNT)在分散剂或分散剂和聚合物(PA6)载体中处理后制备出两种母粒,将其作为增强材料分别和PA6切片熔融共混纺丝,制备出碳纳米管的增强PA6纤维,研究其结构和力学性能.CNT含量低于0.5%(质量分数)时,使用两种母粒制备出的纤维强度和模量都提高,NT含量为0.03%时增强的效果最好.由碳纳米管和分散剂组成的母粒增强效果更好,NT的含量为0.03%时就能使PA6纤维的强度和模量分别提高23%和76%.这种增强纤维是一种微纤增强纤维,纳米CNT在纤维中均匀分散且沿着纤维轴的方向取向.这种结构能有效地转移载荷,具有增强作用,且取向性越好,增强效果越好.

Performances of PA6 fibers reinforced with carbon nanotubes

Two kinds of master batches of carbon nanotubes (CNT) were obtained by dispersing CNT in dispersing agent and polymer (PA6) carrier or in dispersing agent, then CNT reinforced PA6 fibers were obtained by blending melt spinning of PA6 and CNT master batches. The mechanical property and structure of the fibers were also studied. When the CNT content (mass fraction)in fiber is lower than 0.5%, the strength and modulus of the fibers are higher than that of pure PA6 fiber, and the fibers with 0.03% CNT have the best strength and modulus. The effect of master batch consisting of carbon nanotubes and dispersing agent is better, and at 0.03% CNT adding, the strength and modulus of the PA6 fiber with this master batch increase by 23% and 70%, respectively. The reinforced PA6 fibers are fibril-reinforced fibers. Carbon nanotubes exhibit good dispersion in the PA6 matrix and orient along the fiber axis. This structure can transfer the load effectively and the effect of reinforcement will be improved with the degree of orientation of CNT in the fibers increasing.