通过在改性双马来酰亚胺树脂中添加热塑性酚酞聚芳醚砜（PES），制备了在室温下具有良好成膜性的改性双马来酰亚胺树脂膜。改性双马来酰亚胺树脂的差示扫描量热（DSC）、凝胶时间、动态和恒温黏度研究表明，该树脂膜在初始反应温度130℃时，改性双马来酰亚胺的黏度为139．3mPa·s，黏度≤1000mPa·s和黏度≤3000mPa·S的保持时间分别为98min和117min，有利于RFI成型工艺对增强体的熔渗。采用控制体／有限元法对带十字加强筋形式的复合材料制件进行了RFI成型工艺的数值模拟，预测了在130℃和-0．1MPa条件下，浸渍高度与时间的关系以及压力分布，并预测了浸渍高度极限值。成功制备了曲面带十字加强筋的碳纤维／改性双马来酰亚胺复合材料制件，经A扫描和C扫描，未发现明显缺陷。
A modified bismaleimide resin film with a good film-formability was fabricated by adding thermoplastic polyether sulphone （PES）. The DSC, gel time, dynamic viscosity and viscosity at certain temperature were measured. The film has a low viscosity at 130 ℃ （139.3 mPa. s）, and the retention time for viscosity less than 1000 mPa＇s and 3000 mPa＇s at 130 ℃ are 98 min and 117 min, respectively, which makes the resin easily impregnate the fiber perform thoroughly in resin film infusion （RFI） process. A numerical simulation of RFI for composite unit with crossed stiffener was analyzed by control volume/finite element method. The change of infusion height with time, the pressure distribution and the limit infusion height at 130 ℃ and 0. 1 MPa were predicted. The arbon fiber/madiied bismaleimide composite with crossed stiffener was successfully prepared, in which no obvious defects were observed by A and C scan.
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