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作为无缺陷的纳米尺度的结构单元,碳纳米管有着前所未有的力学性能。但是由于碳纳米管与聚合物基质之间结合较弱,其在复合材料中的潜能尚未得到完全发挥。本研究通过将由碳纳米管组成的三维网络结构与聚合物链段在分子尺度进行耦合,使碳纳米管的真正潜力在宏观尺度的复合材料中得以发挥。有着这种结构的复合纤维的力学强度相比于离散碳纳米管增强复合材料有了数量级的提高。不仅如此,纳米管与聚合物链分子尺度的耦合可以导致热固性和热塑性基体复合纤维的力学性质明显不同,表明传统的宏观复合理论不能解释这种纳米尺度的耦合行为。
As a flawless nanoscale structural unit, carbon nanotubes have unprecedented mechanical properties. However, due to the weak bond between the carbon nanotubes and the polymer matrix, their potential in the composite material has not yet been fully realized. In this study, the true potential of carbon nanotubes was demonstrated in the macro-scale composites by coupling the three-dimensional network structure of carbon nanotubes with the polymer chains at the molecular scale. The mechanical strength of the composite fibers with this structure is an order of magnitude increase over discrete carbon nanotube reinforced composites. Moreover, the coupling of nanotubes to the molecular chains of the polymer chains leads to markedly different mechanical properties of the thermosetting and thermoplastic matrix composite fibers, indicating that conventional macroscopic recombination theory can not explain this nanoscale coupling behavior.