Title: ADVANCED BENZOXAZINE FORMULATION FOR SEMISTRUCTURAL FST APPLICATIONS
Abstract: A two-component, benzoxazine-based system is prepared for interior applications in the aerospace industry. Thermal, physical, mechanical and fire, smoke and toxicity (FST) properties of a model formulation is evaluated and reported here. The proposed system possesses a cure enthalpy of 400 J/gram and it is suitable for both resin transfer and prepreg processing due to a flexible viscosity profile. The mechanical properties of a composite laminate made with E-glass demonstrate superior short beam shear and compressive strength compared to typical phenolic based systems used in interior application. It also shows better performance under tension and flexural loading. The FST performance of the system is evaluated by testing laminates prepared with 7781 8H-satin glass fiber. Different thicknesses and fiber volume fractions are used in order to show the robustness of FST properties. Laminate with 2.25 mm thickness and fiber volume fraction of 52% is passed FST test with heat release values well below the threshold set by FAA. Overall, the good FST properties, ease of processability with different fabrication methods, relatively high mechanical performance, and superior surface finish (lower manufacturing costs) demonstrate that the benzoxazine-based resin reported here can provide significant design advantages over phenolic for FST-interior applications.
Authors: Mahdi Ghazizadeh, Dong Le, Derek S. Kincaid
Conference: CAMX 2017 –Orlando