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针对浮动催化化学气相沉积(CVD)法制备的碳纳米管(CNTs)膜,首先采用红外光谱表征分析了包覆在CNTs表面的无定形物质的组成,然后分别采用热处理和酸洗处理方法,考察了CNTs膜中无定形物和残留Fe催化剂对CNTs膜拉伸取向行为的影响。结果表明:采用CVD法制备的CNTs膜中CNTs表面无定形物为含氧或烷烃、烯烃类低聚物,可通过350℃有氧热处理基本去除。该CNTs膜的牵伸取向重排行为受组成影响显著,CNTs表面的低聚物可增强CNTs的管间黏结作用,Fe催化剂颗粒成为CNTs网络结构的交联结点,两者均有利于提高CNTs的取向程度和聚并成束的尺寸,进而提高CNTs膜的拉伸稳定性和断裂韧性。牵伸取向后CNTs膜与环氧树脂溶液的浸润性提高,其CNTs膜/环氧复合材料的拉伸强度和模量达到1 228 MPa和94.5GPa,相比初始无规CNTs膜/环氧复合材料的分别提高了337%和729%。
For the CNTs films prepared by the floating catalytic chemical vapor deposition (CVD) method, the compositions of the amorphous materials coated on the surface of CNTs were firstly analyzed by infrared spectroscopy, and then the heat treatment and pickling treatment were used respectively to investigate The influence of amorphous CNTs and residual Fe catalyst on the tensile properties of CNTs films were investigated. The results show that the CNTs films prepared by CVD have amorphous CNTs as oxygen or alkane and olefin oligomers, which can be basically removed by 350 ℃ aerobic heat treatment. The drafting orientation rearrangement behavior of the CNTs films was significantly affected by the composition. The oligomers on the CNTs surface enhanced the inter-tubular adhesion of the CNTs, and the Fe catalyst particles became the cross-linking node of the CNTs network structure, both of which were conducive to improving the CNTs The degree of orientation and the size of the polygons into bundles, thereby improving the tensile stability and the fracture toughness of the CNTs films. Compared with the initial random CNTs film / epoxy composite, the tensile strength and modulus of the CNTs film / epoxy composites reached 1 228 MPa and 94.5 GPa, respectively. Materials increased by 337% and 729% respectively.