Preparation And Performance Research For Carbon Fiber Reinforced Polyethylene Terephthalate Composite

In this paper, PET and SCF with 2mm length were chosen to prepare for PET/SCF composites by melt extrusion processing. The optimum process conditions were obtained through experiments, and we studied SCF content and the surface treatment influence on the properties of composites. Research showed that tensile strength, flexural strength, flexural modulus was increased with increased SCF content expect impact strength and meltfludity which increased first and then decreased. Addition of SCF brought faster crystallization and better thermostability. Concentrated nitric acid, silane coupling agent, titanate coupling agent were used to treat carbon fiber surface. When carbon fiber was treated with concentrated nitric acid and silane coupling agent, the composite has the best mechanical properties. Results showed that when carbon fiber surface was treated, the tensile strength of the composite increased 15%, while the flexural strength increased 22%, the flexural modulus increased 15%, the impact strength increased 13%, and the hardness increased 10%. Carbon fiber surface treatment had no influence on the thermostability of the composite and brought faster crystallization. The meltfludity and the usability of the composite also improved after carbon fiber surface treatment.As above description, PET/SCF composite will be prepared by thermo-melt-molded machine after proper treatment on the carbon fiber surface treatment. The composite which has less weight and higher strength would find application in the car industry.