Characterization Of Nano-Carbon Grafted Carbon Fiber Reinforcenent And Interfacial Properties Of Its Composites

Carbon fiber (CF) has played an important role in the field of national defense, science and technology using as an important reinforcement in the functional composites. The interfacial bond strength between carbon fiber and its matrix is an important parameter to evaluate the mechanical properties of carbon fiber composites. The better interface bonding could improve the mechanical properties of composites because carbon fiber could transfer load effectively at this condition.A kind of novel carbon fiber reinforcement with carbon nanotube or graphene oxide grafted on its surface was prepared by the grafting to method. Functional groups and morphology of the resulting samples were examined by IR, XPS, SEM and AFM. The wettability and tensile strength of carbon fibers were investigated by contact angle measurement, infiltration test and single strands extension. The interfacial shear strength of carbon fiber reinforced composites was measured by micro-debonding method. Meanwhile, the best grafted content of nanotube was studied.The results showed that the acidification nanotube or graphene oxide grafted on the surface of modified carbon fiber by chemical linkage. It is better for acidification nanotube grafted on the surface of modified carbon fiber when the temperature is 20℃~30℃, the content of PAMAM is 60% and that of grafted nanotube is 15%. This enhances the surface roughness, surface energy, tensile strength and maximum absorbing amount of resin by 179.3%, 41.3%, 22% and 228.9%, respectively. And the interfacial shear strength of carbon fibers reinforced composites is increased up to 178%. On the other hand, though the grafted graphene oxide has little effect on the tensile strength, it could enhance the surface roughness, surface energy and maximum absorbing amount of resin by 175.4%, 46.3% and 358.1%, respectively. And the interfacial shear strength of carbon fibers reinforced composites was enhanced up to 117.7%. The results indicate that the grafted carbon nanotube or graphene oxide is helpful to improve the interface properties of carbon fibers reinforced composites.