Mechanical property improvement of carbon fiber reinforced polybenzoxazine by rubber interlayer

The rubber interlayer method was chosen in order to improve the properties of carbon fiber-reinforced polybenzoxazine composites. The resin used is benzoxazine based on bisphenol-A, formaldehyde and 3,5-xylidine. The effect of rubber concentration on the flexural properties of the composites is investigated. Sized and desized carbon fiber woven fabrics are used to study the effect of the sizing materials on the mechanical properties. The delamination toughness of the composites is increased by the ATBN rubber interlayer with increasing ATBN concentration. The strength of the composite also increased, but an anomalous concentration effect has been observed.