原位聚合法与溶液混合法制备石墨烯/聚酰亚胺复合材料及其性能

摘要

Reduced graphene oxide/polyimide ( rGO/PI) composites were prepared by the incorporation of the PI by in-situ poly-merization and solution blending methods. The influence of these methods on the mechanical and electrical properties of the compos-ites was investigated. Results indicate that the addition of the rGO to PI significantly changes its mechanical and electrical properties. The rGO is more homogeneously dispersed in the PI, its re-aggregation in the PI is significantly inhibited, and the tensile strength and electrical conductivity of the composites are higher for the in-situ polymerization method than the solution blending one. The tensile strength and electrical conductivity of the composite reach the highest values of 132. 5 MPa and 6. 87×10-4 S·m-1 with rGO additions of 1. 0 and 3. 0 wt%, respectively for the in-situ polymerization method, which are 68. 8% and 8 orders of magnitude higher than the corresponding values for pure PI.%利用化学氧化还原法制备出石墨烯。通过原位聚合法及溶液混合法制备出石墨烯/聚酰亚胺复合材料,考察不同复合材料制备方法对其机械性能及导电性能的影响,并对其作用机理进行探讨。结果表明,制备的石墨烯为二维的单层或寡层材料,加入到聚酰亚胺中能够增强其机械性能及电导率。相比溶液混合法,采用原位聚合法时石墨烯在聚酰亚胺基体中分散更均匀,对其团聚作用有更好的抑制作用,制备的复合材料性能更优异。采用该法加入石墨烯的量为1.0 wt%时,拉伸强度达到了132.5 MPa,提高了68.8%；加入量增加到3.0 wt%时,电导率达6.87×10-4S·m-1,提高了8个数量级,对聚酰亚胺的性能有显著的增强作用。