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以浮动催化化学气相沉积法(CVD)碳纳米管(CNT)膜为原料,通过氰基树脂溶液浸渍法制备CNT预浸膜,然后采用热辅助牵伸和热压固化的方法制备高取向CNT膜复合材料。详细分析了热处理的温度、树脂溶液浓度对CNT预浸膜拉伸性能的影响,从而得到合适的热辅助牵伸工艺,并考察固化工艺对复合材料性能的影响。在此基础上,从浸润特性、CNT取向程度、层间剪切性能方面揭示CNT膜复合材料力学性能的强化机制。结果表明:CNT预浸膜热牵伸工艺相比于传统CNT膜牵伸工艺更有利于制备高取向CNT膜复合材料。热牵伸的温度和树脂溶液的浓度是制备高取向、低孔隙CNT预浸膜的关键因素。通过固化工艺的改变可有效调控氰基树脂的反应程度与碳纳米管薄膜/氰基树脂复合材料的拉伸性能。经高温后固化处理后CNT膜/氰基树脂复合材料的拉伸强度、模量分别高达2748MPa、302GPa。优异的树脂浸润特性、层间剪切强度以及高的CNT取向度,使CNT膜复合材料中CNT更有利于协同承载,从而提高其力学性能。
CNT prepregs were prepared by flooding catalytic CVD (CNT) film by impregnation method with cyano resin solution. Then the CNT films with high orientation were prepared by heat assisted drawing and hot pressing material. The effects of heat treatment temperature and resin solution concentration on the tensile properties of CNT pre-dipped film were analyzed in detail. Appropriate heat-assisted drawing technology was obtained and the effect of curing process on the properties of the composite was investigated. On this basis, the strengthening mechanism of the mechanical properties of the CNT film composite is revealed from the aspects of the wetting property, the degree of the CNT orientation and the interlaminar shear property. The results show that the hot drawing process of CNT preimpregnated film is more conducive to the preparation of highly oriented CNT film composites than the conventional CNT film drawing process. The temperature of hot drawing and the concentration of the resin solution are the key factors for the preparation of highly oriented, low-porosity CNT prepregs. Through the curing process changes can effectively regulate the reaction of cyano resin and carbon nanotube film / cyano resin composite tensile properties. Tensile strength and modulus of CNT membrane / cyano resin composite after high temperature post-curing treatment were up to 2748MPa and 302GPa respectively. Excellent resin wetting properties, interlaminar shear strength and high degree of orientation of the CNTs make the CNTs in the CNT membrane composite more conducive to co-bearing, thus improving its mechanical properties.