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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。
By adding thermoplastic phenolphthalein polyarylethersulfone (PES) to the modified bismaleimide resin, a modified bismaleimide resin film having good film formability at room temperature was prepared. Differential scanning calorimetry (DSC), gel time, dynamic and isothermal viscosity of the modified bismaleimide resin showed that the resin film modified with bismaleimide at the initial reaction temperature of 130 ℃ Viscosity of 139.3mPa.s, viscosity ≤ 1000mPa.s and viscosity ≤ 3000mPa.s holding time of 98min and 117min, respectively, is conducive to RFI molding process on the infiltration of reinforcement. The control body / finite element method was used to simulate the RFI forming process of the cross-stiffened composite parts. The relationship between the impregnation height and the time and the pressure distribution were predicted under the conditions of 130 ℃ and -0.1MPa Predicted impregnation height limit. A carbon fiber / modified bismaleimide composite material with cross-shaped stiffeners was successfully prepared. A-scan and C-scan showed no obvious defects.