Processing property of a RTM benzoxazine resin and properties of composites

A new high performance benzoxazine resin (BA21) for RTM technique was prepared. The processing property and cure schedule of BA21 resin, and mechanical properties of BA21 matrix composites using RTM were studied. The viscosity tests show that BA21 can meet to the require ments of RTM process. A chemorheology model based on the modified dual-Arrhenius equation was proposed . The model that agrees well with the experimental data can provide a theoretic support for t he mold-filling stage in the RTM process. The overall reaction orders of BA21 were estimated from the isothermal DSC tests based on a modified Kamal kinetics model, and 200 ℃ was chosen as the postcure temperature of the composites. The composites with high fiber contents were prepared by the RTM technique. The fl exure strength and modulus of these composites are up to 600 MPa and 30 GPa, respectively, and the impact strength is up to 200 kJ/ m2.