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采用传统的熔融纺丝技术大量制备了定向性良好的纳米碳管/聚丙烯复合纤维。扫描电镜观察证实了纳米碳管在纤维里的定向性以及分散性都得到了较大的改善。通过拉伸实验测试了纳米碳管/聚丙烯复合纤维的力学性能,采用Weibull统计分析发现纳米碳管的添加显著提高了复合纤维的拉伸强度,当添加纳米碳管的质量分数达到3%时,纤维强度最高,达到61MPa,超过聚丙烯纤维强度120%。复合纤维拉伸断口的形貌特征也证实了纳米碳管添加对复合纤维拉伸性能影响存在临界现象。
A large amount of carbon nanotube / polypropylene fiber with good orientation was prepared by traditional melt spinning technology. Scanning electron microscopy confirmed that carbon nanotubes in the fiber orientation and dispersion have been greatly improved. The mechanical properties of carbon nanotubes / polypropylene composite fibers were tested by tensile test. Weibull statistical analysis showed that the addition of carbon nanotubes significantly enhanced the tensile strength of the composites. When the mass fraction of carbon nanotubes reached 3% , The highest fiber strength, reaching 61MPa, more than 120% strength polypropylene fiber. The morphological characteristics of composite fiber tensile fracture also confirmed the existence of carbon nanotubes tensile properties of the composite fiber there is a critical phenomenon.