功能化石墨烯的制备及石墨烯/聚氨酯复合材料的性能研究

Preparation of functionalized graphene and performance research of graphene/polyurethane composites

以石墨为原料,通过Hummers法和金属Al粉化学还原后超声分散制备了还原氧化石墨烯(rGO),并以钛酸酯偶联剂311W和TiO_2为改性剂,制备了偶联剂改性还原氧化石墨烯(rTGO)和TiO_2包覆还原氧化石墨烯(Ti-rGO)。通过紫外-可见光谱、傅里叶红外光谱及扫描电镜进行了表征,并与聚氨酯共混制备了石墨烯/聚氨酯复合材料和涂层织物,研究了石墨烯种类及添加量对复合材料力学、导电、耐老化性能的影响。结果表明,石墨烯种类及质量分数对复合材料性能影响较大,改性后石墨烯的分散性与稳定性增强,团聚现象降低,石墨烯或功能化石墨烯与聚氨酯复合后,能大幅度提升复合材料的力学、导电及耐老化性能。

Reduced graphene oxide(rGO)was prepared by Hummers method and chemical reduction of metal Al powder,followed by ultrasonic dispersion,on the basis of graphite as raw material.The titanate coupling agent 311 W and TiO2 were used as the modifiers to prepare the coupling agent modified reduced graphene oxide(rTGO)and TiO2 coated reduced graphene oxide(Ti-rGO).The products were characterized by Ultraviolet Visible Spectra(UV-Vis),Fourier Transform Infrared Spectroscopy(FTIR)and Scanning Electron Microscope(SEM).The graphene/polyurethane composites and coated fabrics were prepared by compositing with polyurethane.The effects of graphene types and addition dosage on the mechanical,electrical and aging resistance of the composites were investigated.The results showed that the type and mass fraction had great influence on the property of composites.The dispersion and dispersion stability of functionalized graphene were enhanced and the agglomeration phenomenon was reduced.The combination of graphene or functionalized graphene with polyurethane can significantly improve the mechanical,electrical and aging resistance of the composites.