摘要
以碳纳米管(CNTs)和热塑性聚氨酯(TPU)为原料,通过硫酸(H2SO4)/硝酸(HNO3)混合溶液处理碳纳米管颗粒表面以达到改性的效果,使用改性过后的碳纳米管熔融共混制备出TPU/CNTs复合材料。研究了不同含量的CNTs对TPU基体的流变、力学、耐磨性以及热性能的影响。结果表明,改性过后的CNTs在TPU基体中形成了良好的分散性和相容性;TPU/CNTs复合材料在高频剪切下保留了复合材料的加工流动性,并且复合材料的拉伸强度以及耐磨性相较于TPU有明显的增强,其中在改性碳纳米管含量较低时,复合材料的力学性能改善较为明显;改性CNTs的加入提高了TPU基体的熔融温度和结晶度;改性CNTs的加入提高了复合材料的热降解温度,提高了TPU基体的热稳定性。
In this work,the surface of carbon nanotubes(CNTs)was treated with a mixed solution of sulfuric acid(H2SO4)/nitric acid(HNO3),and then thermoplastic polyurethane(TPU)composites were prepared through melt blending using the modified CNTs as a raw material. The effects of CNTs content on the rheological,mechanical,wearresistant,and thermal properties of the composites were investigated. The experimental results indicated the modified CNTs exhibited a good dispersibility in the TPU matrix due to the good compatibility between the filler and matrix. The TPU/CNTs composite retained a good processing fluidity under high-frequency shearing,and their tensile strength and wear resistance are significantly enhanced compared to pure TPU. This modification effect was especially significant for the composites with a low content of modified CNTs. The mechanical properties of the composites were improved significantly. Differential scanning calorimetry analysis results indicated that the addition of modified CNTs improved the melting temperature and crystalline level of the TPU matrix. Thermogravimetric analysis results indicated that the addition of modified CNTs improved the thermal degradation temperature and thermal stability of the composites.
作者
李凯泽
辛勇
LI Kaize;XIN Yong(School of Mechanical and Electrical Engineering,Nanchang University,Nanchang 330036,China)
出处
《中国塑料》
CAS
CSCD
北大核心
2022年第6期1-5,共5页
China Plastics
基金
国家自然科学基金(51365038)。
关键词
碳纳米管
热塑性聚氨酯
流变性能
热性能
力学性能
carbon nanotubes
thermoplastic polyurethane
rheological behavior
thermal performance
mechanical property
