改性剑麻纤维素微晶/碳化硅/聚酰亚胺基高性能导热摩擦复合材料的设计、制备与性能研究

For the current problems of polymer-based friction composites, such as low thermal conductivity and heat resistance of matrix resin, difficulty of interface compatibility between components, poor wear resistance and instability of friction properties. A high performance thermal conductivity friction composite of modified sisal fiber microcrystalline cellulose/silicon carbide/fluorinated and sulfonyl polyimide (SFMC-SiC/SiC/FPI) was synthesized by scientific molecular design. The influences of component content, molecular structure and process conditions on the properties of composite material including friction property, thermal conductivity, thermal property and dynamic mechanical property will be studied. The results will help to master the preparation technology and reveal the relationship between structure and properties of composite material. This project is expected to reveal the key problem of the compatibility and dispersibility between SFMC-SiC/SiC and FPI, preparation technology and performance governor of materials. The friction properties and thermal conductivity mechanism of synergism of molecular structure and micro-nano multiscale structures are also revealed, thereby proposing the mechanism of friction and wear mechanism and thermal conduction theory synergistic enhanced of SFMC-SiC/SiC. The obtained results not only have good academic innovation but also have important value for promoting the application of environment-friendly high performance thermal conductivity friction composites.

针对目前聚合物基摩擦复合材料存在基体树脂导热率低、耐热性不足、各组分界面相容性困难、耐磨损差、摩擦性能不稳定性等问题，本项目通过分子设计制备一种改性剑麻纤维素微晶/碳化硅/含氟含砜聚酰亚胺基高性能导热摩擦复合材料（SFMC-SiC/SiC/FPI）。研究复合材料的组分含量、分子结构和工艺条件对其摩擦性能、导热性能、热性能及动态力学性能的影响；掌握复合材料的制备技术并获得材料结构与性能的关系规律；解决SFMC-SiC/SiC与基体树脂的相容性和分散性、复合材料制备技术及其性能调控等关键问题；揭示基体树脂分子结构、SFMC-SiC/SiC微纳米多尺度复合结构对复合材料摩擦性能及热导率的协同作用机制，提出SFMC-SiC/SiC协同增强摩擦磨损机理及热传导理论。本项目目标的实现，不仅具有很好的学术创新性，而且对推动环保型、高性能导热摩擦复合材料的应用具有重要价值。

针对目前聚合物基摩擦复合材料存在基体树脂耐热性不足、各组分界面相容性困难、耐磨损差、摩擦性能不稳定性等问题，本项目通过分子设计制备一类含氟聚酰亚胺基高性能摩擦复合材料（SiC/FPI和SFMC-SiC/FPI）。研究复合材料的组分含量、分子结构和工艺条件对其摩擦性能、导热性能、热性能及动态力学性能的影响；掌握复合材料的制备技术并获得材料结构与性能的关系规律；解决SFMC-SiC和SiC与基体树脂的相容性和分散性、复合材料制备技术及其性能调控等关键问题；揭示基体树脂分子结构、SFMC-SiC和SiC微纳米多尺度复合结构对复合材料摩擦性能作用机制，提出SFMC-SiC和SiC协同增强摩擦磨损机理。本项目目标的实现，不仅具有很好的学术创新性，而且对推动环保型、高性能摩擦复合材料的应用具有重要价值。