The Pultrusion Process And Mechenical Properites Of Pultruded Carbin Fiber/Vinyl Ester Resin Composite

The matrix formulations, pultrusion processes and mechanical properties of the pultruded carbon fiber/vinyl ester resin composites were investigated. A new method was employed to on-line treat the carbon fibers during pultrusion processing.In order to find a resin matrix favorable for the pultrusion, the combinations of two kinds of organic-peroxide initiators were used, and the curing characteristics of the resulting resin matrix were studied using Differential Scanning Calorimeter (DSC) and Infra-red spectrometer (1R). The pultrusion processes (temperature and speed) and the effect of fiber fractional and release agent on the mechanical properties of the composites were analyzed individually. In addition, the effects of interface between carbon fibers (CF) and resin matrix on the mechanical properties of the composites were researched by using Dynamic Mechanical Thermal Analysis (DMTA) and Scanning Electron Microscopy (SEM).Resulted showed that a suitable combination of initiators enhanced the curingdegree of resin matrix and was favorable for the pultrusion. A continuous and stable pultrusion process for carbon fiber/vinyl ester resin composites was obtained by adjusting pultrusion temperature, pultrusion speed and matrix formulation. The Surfacetreatment on carbon fibers by means of air-oxidization removed the sizing incompatible with vinyl ester resin, improved the carbon fiber surface roughness, increasing the interlaminar shear strength (ILSS) from 45 MPa for un-treatment to 70 MPa for treatment. DMTA results indicated that the improvement of the interfacial adhesion between carbon fibers and resin matrix reduced tg 8 and loss modulus, which is useful in improving the composites fatigue-resistance.