Abstract
Three modified bismaleimide resin systems (designated as systems I, II, and III) for high-performance radomes are introduced. Their glass transition temperatures are 274°, 268°, and 265°C, respectively; and their dielectric loss tangents at 10 GHz are 0.0117, 0.0108, and 0.0118, respectively. System I and system II are suitable for hot-pressing process; and system III, which has attractive processing characteristics, is suitable for resin transfer molding (RTM). The injection temperature of system III is room temperature, at which its viscosity is only 0.38 Pa·sec. In addition, its working life is more than 40 h. Properties of neat resins and composites are investigated; all data show that they have good thermal and mechanical properties as well as excellent dielectric properties. These indicate that the three modified bismaleimide resins can be used as matrix resins for advanced radomes.
Published Version
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