Research On Preparation And Mechanical Propetties Of Carbon Fiber Reinfroced Polyproplene

Carbon fibers are fibers consisting of at least 92% carbon,usually in the non-graphitic state. Carbon fibers combine low weight and exceptional mechanical properties, making them ideal reinforcements for composite materials, such as fiber reinforced plastic metal、ceram、cement and carbon-carbon composite. In this paper, the influence of cenosphere and PP-g-MAH on the performance of composite materials were researched, the Thermoplastic polypropylene resin was used as research object and was blended with carbon fiber and cenosphere to get the CF/GB/PP blend.First, by mixing with short carbon fiber the qualified samples were prepared by different molding processes and were tested. The distribution of carbon fiber in matrix and the influence of temperature on heat moulding were researched. Moreover, The samples which were prepared by different molding processes were contracted.Secondly, the influence of carbon fiber and compatibilizer on the performance of CF/PP composite materials were researched. By increasing the content of CF from 0 to 15wt%, the density、maximum torque、equilibrium torque、tensile strength and vicat softening point temperature tended to increase, while the notched impact strength showed a slight increase first and then decreased slowly. PP-g-MAH had a positive effect in the interface of compound system. Adding PP-g-MAH, carbon fiber can be wrapped by matrix easily which greatly reduced the chance of stripping. The notched impact strength of MAH15 is 11.3KJ/m2, and the interlaminar shear strength is 34.5Mpa, respectively 60.5% and 25.6% higher than CF5.Finally, the third phase cenosphere was added and the influences of content on macro-performance and microscopic structure were researched. Along with the increase of cenosphere, the tensile strength of the composite system increased first and then reduced. When adding 15wt% GB, the tensile strength had a maximum,37.2Mpa, respectively 46.5% higher than PP. Nevertheless, the notched impact strength has been increased all along. When adding 20wt% GB, the notched impact strength had a maximum,12.0KJ/m2, respectively 30.4% higher than PP. The fracture structure gained by SEM showed that some cenospheres had been destroyed in the samples and along with the increase of cenosphere, the amount of holes in the matrix which emerged after the carbon fibers were pulled out was reduced but the amount of marks which emerged after the cenospheres flaked off when the samples impacted. The author thought that due to adding the third phase cenosphere in the impact process the main solid supports were cenospheres instead of carbon fibers. In the same adding mount, the mechanical properties of CF/GB/PP was better than CF/PP-g-MAH/PP, and the cost was lower.