Carbon nano tube reinforced polybenzimidazole compound and preparation method thereof

The invention relates to a carbon nano tube reinforced polybenzimidazole compound and a preparation method thereof, and belongs to the technical field of nano composite materials. The preparation method comprises the following steps: dispersing multi-wall carbon nano tubes to a reactor filled with a methane sulfonis acid and phosphoric pentoxide mixed solution by using ultrasound, adding 4,4'-dimethyldihenyl ether, heating, stirring, and carrying out nitrogen protection treatment to obtain functional multi-wall carbon nano tube solution; and adding 3,3'-diaminobenzidine, heating to react, putting the reactor in ice water, washing with alkali, washing with water, and vacuum-drying to obtain the carbon nano tube reinforced polybenzimidazole compound. The temperature of 1% of carbon nano tube reinforced polybenzimidazole compound synthesized by the one-step method is 50-70 DEG C higher than that of the pure benzimidazole polymer when the hot weight loss is 5%, the tensile strength is higher than that of the pure