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采用熔融共混法制备了不同质量分数的羧基化多壁碳纳米管(CMWNTs)/聚己二酸己二胺(PA66)切粒,并将切粒熔融纺丝制成CMWNTs/PA66复合纤维。采用SEM、DMA和单纤维电子强力仪等研究了CMWNTs对复合纤维形貌和力学性能的影响。CMWNTs在纤维中沿纤维轴向束状分布均匀。CMWNTs的加入提高了PA66纤维的力学性能和玻璃化温度。CMWNTs的质量分数为0.5%时,CMWNTs/PA66复合纤维的储能模量最大,为PA66纤维的5.5倍;玻璃化温度提高了27.6℃。CMWNTs的质量分数为0.3%时,复合纤维的初始模量最大,比PA66纤维增加了101.4%。当CMWNTs的质量分数为1%时,复合纤维的断裂强度最大,与纯PA66相比增加了48.8%。
CMWNTs / polyhexamethylene adipamide (PA66) pellets with different mass fractions were prepared by melt blending, and the pellets were melt-spun into CMWNTs / PA66 composite fibers. The effects of CMWNTs on the morphology and mechanical properties of composite fibers were investigated by SEM, DMA and single fiber electron force meter. CMWNTs are evenly distributed in the fiber along the fiber axis. The addition of CMWNTs enhanced the mechanical properties and glass transition temperature of PA66 fiber. When the mass fraction of CMWNTs is 0.5%, the storage modulus of CMWNTs / PA66 composite fiber is the largest, which is 5.5 times that of PA66 fiber; the glass transition temperature is increased by 27.6 ℃. When the mass fraction of CMWNTs is 0.3%, the initial modulus of composite fiber is the largest, which increases by 101.4% compared with that of PA66 fiber. When the mass fraction of CMWNTs is 1%, the breaking strength of the composite fiber is the largest, an increase of 48.8% compared with pure PA66.