ADVANCES IN BENZOXAZINE RESINS FOR AEROPSACE APPLICATIONS

摘要

Benzoxazine resins offer high temperature performance, low moisture uptake, good flame, smoke and toxicity, and the potential for ambient storage. This paper describes the development of benzoxazine resins for aerospace applications focusing on liquid resin technologies, including resin transfer molding (RTM) and vacuum assisted RTM (VARTM). For these applications ease of processing is required and resins have been formulated with suitable viscosity and the thermal stability at process temperatures. A compatible binder has been developed which allows fabric preforming, does not affect the temperature performance, and provides composite toughness similar to that of toughened prepreg systems. A further step is the development of a benzoxazine resin which has high intrinsic toughness without the use of a binder, and can be processed by RTM/VARTM techniques. This opens up the possibility of high temperature performance and high toughness in 3-D weaves and preforms where it is impractical to insert a binder or veil.