Dispersity of chopped carbon fiber and its effect on mechanical properties of gypsum-based composite materials
H2O2 and NaClO were used for surface oxidation treatment of chopped carbon fiber.Chopped carbon fiber rein-forced gypsum-based composite materials were prepared by three dispersion methods of PCE,HPMC and ultrasonic dispersion,and then the mechanical properties were studied.The results show that the surface roughness of the oxidized chopped carbon fiber in-creased with the increase of the content of hydrophilic oxygen-containing functional groups hydroxyl and carbonyl,and the oxidized chopped carbon fiber had the best dispersion effect in PCE solution.The mechanical strength of gypsum hardened were effectively improved by adding chopped carbon fiber.The strength of gypsum hardened increased maximum by 72.4％with the chopped car-bon fiber treated by PCE dispersion,which content was 1％and the length was 6 mm.The dispersion of chopped carbon fiber in gypsum paste was improved by the dual action of adsorption of PCE on the surface of chopped carbon fiber and the steric hin-drance effect formed by the reaction of PCE with gypsum particles,and then the mechanical strength of gypsum-based composites materials was improved.
万方数据
维普
