Improved mechanical properties of aligned multi-walled carbon nanotube/thermoplastic polyimide composites by hot stretching
Improved mechanical properties of aligned multi-walled carbon nanotube/thermoplastic polyimide composites by hot stretching
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DOI：
10.1177/0021998318796916
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发表时间：
2018-09
影响因子：
2.9
通讯作者：
T. Nam;K. Goto;Toshiki Kamei;Y. Shimamura;Y. Inoue;Satoshi Kobayashi;S. Ogihara
中科院分区：
文献类型：
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作者：
T. Nam;K. Goto;Toshiki Kamei;Y. Shimamura;Y. Inoue;Satoshi Kobayashi;S. Ogihara
采用热熔加工方法和真空辅助系统开发了基于热塑性聚酰亚胺树脂和定向多壁碳纳米管片的高耐热复合材料。水平排列的碳纳米管片是使用拉伸和压卷技术由垂直排列的碳纳米管阵列生产的。研究了加工条件、碳纳米管含量和热拉伸对复合材料机械性能的影响。在410℃的温度和2 MPa的压力下成功制备了定向碳纳米管/热塑性聚酰亚胺复合材料。复合材料的表面形貌显示出碳纳米管的高度排列和致密堆积，以及热塑性聚酰亚胺基体对排列的碳纳米管片的良好浸渍。在本研究中，定向碳纳米管/热塑性聚酰亚胺复合材料的最佳机械性能是在碳纳米管体积分数约为50%时实现的。在高于玻璃化转变温度且低于熔融温度的温度下对定向碳纳米管/热塑性聚酰亚胺复合材料进行热拉伸，显着改善了复合材料的机械性能。
High heat resistance composites based on thermoplastic polyimide resin and aligned multi-walled carbon nanotube sheets have been developed using hot-melt processing method with a vacuum-assisted system. The horizontally aligned carbon nanotube sheets were produced from vertically aligned carbon nanotube arrays using drawing and press-winding techniques. Effects of processing conditions, carbon nanotube contents, and hot stretching on the mechanical properties of the composites were examined. The aligned carbon nanotube/thermoplastic polyimide composites were fabricated successfully at a temperature of 410℃ under 2 MPa pressure. The surface morphologies of the composites showed high alignment and dense packing of carbon nanotubes, and a good impregnation of the thermoplastic polyimide matrix into the aligned carbon nanotube sheets. The best mechanical properties of the aligned carbon nanotube/thermoplastic polyimide composites were achieved at the carbon nanotube volume fraction of about 50% in this study. Hot stretching of the aligned carbon nanotube/thermoplastic polyimide composites at the temperatures above the glass transition temperature and below the melting temperature improved the mechanical properties of the composites considerably.