PEEK/石墨烯复合材料制备及非等温结晶动力学

Non-Isothermal Crystallization Kinetic Behavior of Graphene Reinforced PEEK Nanocomposites

制备了不同含量的石墨烯纳米片(GE)增强聚醚醚酮(PEEK)复合材料,利用差式扫描量热仪探究了在非等温条件下PEEK/GE纳米复合材料的结晶动力学行为。结果表明,加入GE,使PEEK/GE纳米复合材料的结晶度降低,说明GE主要表现阻碍聚合物分子链运动的作用。随着GE含量的增加,峰值温度和成核活性逐渐提高,说明基体中的GE逐渐促进PEEK结晶。此外,采用Mo法可以很好地描述PEEK/GE纳米复合材料的非等温结晶过程。加入GE降低其结晶过程中所需要的温度梯度。

The research on non-isothermal crystallization kinetics of poly （ether ether ketone）（PEEK）nanocomposites with addition of graphene （GE） was executed by differential scanning calorimetry （DSC）. The result shows that the absolute crystallinity of PEEK/GE composites decreases with the graphene content increasing,indicating the restricted effect of the graphene on the mobility of PEEK molecular chains. With the increase of graphene content,the peak temperature and nucleation activity gradually increase,and the activation energy decreases,indicating that the graphene in the matrix gradually promotes the crystallization of PEEK. The Mo equation is proved to be the reasonable model to depict the crystallization behavior of the PEEK/GE nanocomposites under non-isothermal condition. Adding GE can reduce the temperature gradient required during the crystallization process.