Increasing the toughness while reducing the viscosity of carbon nanotube/ polyether imide/polyether ether ketone nanocomposites  

高韧性低黏度碳纳米管/聚醚酰亚胺/聚醚醚酮纳米复合材料的研究

作　　者：SONG Jiu-peng ZHAO Yan LI Xue-kuan XIONG Shu LI Shuang WANG Kai 宋九鹏;肇研;李学宽;熊舒;李爽;王凯(北京航天航空大学,材料科学与工程学院,北京100010)

机构地区：[1]School of Materials Science and Engineering,Beihang University,Beijing 100191,China

出　　处：《新型炭材料（中英文）》2024年第4期715-728,共14页New Carbon Materials

摘　　要：Polyether ether ketone(PEEK)has good mechanical properties.However,its high viscosity when molten limits its use because it is hard to process.PEEK nanocomposites containing both carbon nanotubes(CNTs)and polyether imide(PEI)were pre-pared by a direct wet powder blending method using a vertical injection molding machine.The addition of an optimum amount of PEI lowered the viscosity of the molten PEEK by approximately 50%while producing an increase in the toughness of the nanocom-posites,whose strain to failure increased by 129%,and fracture energy increased by 97%.The uniformly dispersed CNT/PEI powder reduced the processing difficulty of PEEK nanocomposites without affecting the thermal resistance.This improvement of the strength and viscosity of PEEK facilitate its use in the preparation of thermoplastic composites.聚醚醚酮(PEEK)具有良好的力学性能,但其较高的熔体黏度,加工过程困难,因而限制了其广泛应用。本文采用湿粉法制备碳纳米管(CNTs)和聚醚酰亚胺(PEI)修饰的PEEK纳米复合材料,纳米复合材料的熔体黏度降低约50%。CNTs和PEI的加入使纳米复合材料的韧性得到提高。当PEI含量为4.95%,CNTs含量为0.05%时,纳米复合材料的断裂延伸率提高了129%,拉伸断裂能提高了97%。通过该方法制备的纳米复合材料熔体黏度较低,均匀分散的CNT/PEI可在不影响耐热性的前提下有效降低PEEK纳米复合材料的加工难度。这种粉末共混改性的方法有望应用于热塑性复合材料的粉末浸渍工艺或激光烧结技术。

关 键 词：NANOCOMPOSITES Mechanical properties Rheological properties Microstructural analysis 

分 类 号：TB33[一般工业技术—材料科学与工程]