Wang Q B, Jia D L, Pei X H, Wu X L, Xu F, Ye Z H, Wang H X
Department of Oil & Gas Production Equipment, Research Institute of Petroleum Exploration and Development, Xueyuan Road 20#, Beijing, 100083, China.
School of Mechanical Engineering, Jiangsu University, Xuefu Road 301#, Zhenjiang, 212001, China.
Sci Rep. 2022 Mar 8;12(1):4114. doi: 10.1038/s41598-022-08221-0.
Polymer composites are gradually replacing traditional metal materials in the fields of aviation, aerospace, automotive and medicine due to their corrosion resistance, light weight and high strength. Moulding technology and organization morphology of polymer composite are key elements affecting the quality of products and their application, so a vacuum hot pressing process for graphene/poly(ether ketone ketone) (PEKK) (x = 0%, 2%, 3%, 4%, 5%, 6%) composite powders is explored with particularly designed moulding parameters to achieve high conductive properties and good mechanical properties in graphene/PEKK composite sheet with thickness of 1.25 mm and diameter of 80 mm. The vacuum environment ensures that the graphene is not oxidized by air during hot pressing molding, which is essential for achieving conductive property in the graphene/PEKK composite; The hot pressing temperature of each graphene/PEKK composite powder is higher than glass transition temperature but lower than melting temperature, which ensures the graphene/PEKK composite powders is fully compacted and then graphene is fully lapped in the composite sheet. In addition, the graphene/PEKK composite sheet shows conductive property when the graphene content increases to 3wt%, and then the conductivity of the composites increases and then decreases with a peak value at 5wt% with increasing graphene content. By comparing the mechanical properties and microstructure morphology of the graphene/PEKK composite sheets, it was obtained that graphene content has an obvious effect on the mechanical properties of the composites, e.g., the mechanical properties will be increased as the graphene content increasing when graphene content is more than 3%. The graphene distribution law of the composite material with different graphene contents is analysed using a scanning electron microscope (SEM).
由于具有耐腐蚀、重量轻和强度高等特性，聚合物复合材料在航空、航天、汽车和医学等领域正逐渐取代传统金属材料。聚合物复合材料的成型技术和组织形态是影响产品质量及其应用的关键因素，因此，本文探索了一种针对石墨烯/聚醚酮酮（PEKK）（x = 0%、2%、3%、4%、5%、6%）复合粉末的真空热压工艺，并采用特别设计的成型参数，以在厚度为1.25毫米、直径为80毫米的石墨烯/PEKK复合板材中实现高导电性能和良好的机械性能。真空环境确保了石墨烯在热压成型过程中不会被空气氧化，这对于在石墨烯/PEKK复合材料中实现导电性能至关重要；每种石墨烯/PEKK复合粉末的热压温度均高于玻璃化转变温度但低于熔点温度，这确保了石墨烯/PEKK复合粉末充分压实，进而使石墨烯在复合板材中充分搭接。此外，当石墨烯含量增加到3wt%时，石墨烯/PEKK复合板材表现出导电性能，随后随着石墨烯含量的增加，复合材料电导率先增大后减小，在5wt%时达到峰值。通过比较石墨烯/PEKK复合板材的力学性能和微观结构形态，发现石墨烯含量对复合材料的力学性能有显著影响，例如，当石墨烯含量超过3%时，复合材料的力学性能会随着石墨烯含量的增加而提高。使用扫描电子显微镜（SEM）分析了不同石墨烯含量复合材料的石墨烯分布规律。
