电致驱动巴基纸/形状记忆聚合物复合材料性能

Properties of electrically actuated shape memory polymer composites reinforced by buckypaper

为了研究不同质量比例石墨烯(few-layer graphene,FLG)和碳纳米纤维(carbon nanofiber,CNF)对混杂FLG/CNF巴基纸导电性能的影响,测量了FLG/CNF的质量比例由0提高至50%时巴基纸的体积电阻率,并检测了混杂FLG/CNF巴基纸的微观形态,通过实验还研究了FLG/CNF巴基纸增强形状记忆聚合物复合材料的电致驱动效应及温度场分布情况。试验结果表明:FLG/CNF巴基纸中碳纳米纤维填充了石墨烯片层间的空隙,碳纳米纤维和石墨烯片相互搭接形成连续网络;此外,巴基纸中碳纳米纤维和石墨烯比例的变化可导致巴基纸的电阻值发生改变。巴基纸增强形状记忆聚合物复合材料在90 s时完成了形状恢复,和试样初始形状相比,试样形状约恢复了95%。

In order to study the effect of few-layer graphene（ FLG） and carbon nanofiber（ CNF） on the electrical conductivity of mixed FLG / CNF buckypaper,the volume resistivity of buckypaper was measured as the quality ratio of FLG / CNF increased from 0 to 50%. The microcosmic morphology of FLG / CNF buckypaper was observed using a scanning electron microscope. The electrical actuation and the temperature distribution of the shape memory polymer（ SMP） composites reinforced by FLG / CNF buckypaper were also tested. The results show that CNF bridged the gaps between the FLG layers,and an entangled and continuous network of FLG and CNF is observed. Furthermore,the ratio changes between FLG and CNF in the buckypaper can lead to change in the electrical resistivity of the buckypaper. The shape recovery of SMP composites reinforced by buckypaper is completed at about 90 s. The recovered shape of the specimen is approximately 95% similar to its original shape.