功能化氧化石墨烯/聚酰亚胺复合材料的制备与性能

Preparation and dielectric and mechanical properties of fluorine-functionalized graphene oxide/polyimide nanocomposites

以五氟苯胺作为改性剂对氧化石墨烯进行功能化,制得氟原子功能化石墨烯。将氟原子功能化石墨烯、4,4-二胺基二苯醚和均苯四甲酸二酐溶解在N,N-二甲基乙酰胺中,用原位聚合合成一系列氟原子功能化氧化石墨烯/聚酰亚胺的复合材料,并对复合材料的介电性能和力学性能进行研究。结果表明,氟原子功能化石墨烯添加量为2 wt%时,低频率下复合材料的介电常数由3.61降低到2.80,当加入量为2 wt%时,拉伸强度由11.75 MPa增加到14.2 MPa。

Fluorine-functionalized graphene oxide was obtained by reacting pentafluoroaniline with graphene oxide.Fluorine-functionalized graphene oxide/polyimide nanocomposites were prepared by an in-situ polymerization method using 4,4-diaminodiphenyl ether and pyromellitic dianhydride as the monomers and N,N-dimethylacetamide as the dispersing solvent.The dielectric constant and mechanical properties of the nanocomposites were investigated.Results indicate that when the fluorine-functionalized graphene oxide content is increased from 0 to 2 wt%,the dielectric constant of the nanocomposite decreases from 3.61 to 2.8 and the tensile strength increases from 11.75 to 14.2 MPa.