RTM聚酰亚胺复合材料“离位”增韧技术研究

Research on RTMable Polyimide Composites Toughened by Ex-Situ Methed

研究"离位"增韧对RTM聚酰亚胺树脂基复合材料力学以及韧性性能的影响。结果表明:当增韧剂的含量为15wt%时,经"离位"增韧复合材料的室温层间剪切强度从97.9 MPa提高到110 MPa,而玻璃化转变温度和高温(288℃)复合材料层间剪切强度略有降低。"离位"增韧后,PI-9731ES(F)/G0827复合材料的I型层间断裂韧性(GIC)从310 J/m2提高到459 J/m2。经电镜分析表明,主要是由于将热塑性聚酰亚胺"离位"增韧PI-9731制备复合材料时,可以在复合材料富树脂区形成相反转结构,在裂纹扩展的过程中,包覆热塑性聚酰亚胺的PI-9731粒子发生明显地取向和变形。

The effect of Ex-situ method on the mechanical properties and toughness of the RTMable polyimide composites were studied. The results showed that the interlaminar shear strength of composites toughened by the Ex-situ technique was improved from 97.9 MPa to 110 MPa. when the thermoplastic PI content is 15wt %, However, the Tg and the interlaminar shear strength of composites at high temperature（288℃ ） decreased slightly. The Mode Ⅰ fracture toughness（ GIC ）of composites toughened by the Ex-situ method was improved from 310J/m^2 to 459J/m^2. From SEM results, the main reason is that the PI-9731/G827 composite toughened by the Ex,situ method with the thermoplastic PI, the phase inversion structure can be obtained in the rich resin regions, the PI-9731 particles that were wrapped by thermoplastic PI will be orientated and deformed in the process of crack extension.