Method for improving low temperature resistance of cyanate ester by codoping terbium-carbon nanotube

The invention discloses a method for improving the low temperature resistance of cyanate ester through terbium-carbon nanotube co-doping. Comprising the following steps: (1) mixing terbium salt with a proper cosolvent to obtain a dispersible terbium modifier; and (2) reacting the dispersible terbium modifier with the unzipped functionalized carbon nanotube to obtain the terbium modified carbon nanotube. And (3) co-doping the terbium-carbon nano tube with a cyanate ester monomer. The modifier obtained by the reaction of the terbium salt and the cosolvent can transfer surface energy, significantly reduce the agglomeration effect of the carbon nanotubes, and facilitate the dispersion of the carbon nanotubes in the cyanate ester composite material. Meanwhile, infiltration of the carbon nanotubes and a resin matrix is promoted, anchor points are formed, the friction force between the carbon nanotubes and the resin matrix is increased, and the mechanical property of the composite material at the low temperature is