含磷聚芳醚酮-双马来酰亚胺树脂(PAEK-P-BMI)及碳纤维/PAEK-P-BMI复合材料

Phosphorus-containing polyaryletherketone-bismaleimide resin(PAEK-P-BMI) and carbon fiber/PAEK-P-BMI composites

为提高树脂传递模塑(RTM)复合材料的整体韧性,结合"离位"复合增韧技术和RTM制造技术,应用新型热塑性含磷聚芳醚酮(PAEK-P)对碳纤维/双马来酰亚胺树脂(CF/BMI)复合材料进行增韧改性,研究了PAEK-P-BMI复合树脂的流变性能、分相行为及PAEK-P对CF/BMI复合材料韧性的影响。结果表明,分子链的刚性结构使PAEK-P具有高的耐热性,玻璃化转变温度达到268.8℃,PAEK-P在BMI树脂中的溶解性较差,PAEK-P-BMI复合树脂凝胶时间和黏度急增拐点时间受PAEK-P含量的影响很小;PAEK-P-BMI复合树脂在110℃/300 min条件下未出现相分离,但在后期的高温固化过程形成了分相结构,并在CF/PAEK-PBMI复合材料中保持了分相形貌;与CF/BMI复合材料相比,CF/PAEK-P-BMI复合材料的冲击后损伤投影面积降低了69%,冲击后压缩强度提高了16.6%,冲击凹坑深度减小了34.4%。

In order to improve the toughness of resin transfer molding(RTM)composites,combining the"ex-situ"composite toughening technology and RTM processing,a novel thermoplastic phosphorus-containing polyaryletherketone(PAEK-P)was used to toughen the carbon fiber/bismaleimide resin(CF/BMI)composites.The rheological properties,phase separation behavior of the PAEK-P-BMI resin and the effect of PAEK-P upon the toughness of the CF/BMI composites were investigated.The results show that the PAEK-P resin has high heat resistance at the glass transition temperature of 268.8℃for its rigid structure.The gel time and viscosity increase inflection point time of the PAEK-P-BMI composite resin are little affected by the PAEK-P content because of its poor solubility in BMI resin.The PAEK-P-BMI composite resin shows no phase separation at 110℃/300 min.However,the phase separation structure is formed in the late high temperature curing process,and the phase separation morphology is maintained in the cured CF/PAEK-P-BMI composites.Compared with CF/BMI composites,the CF/PAEK-P-BMI composites have a 69%reduction in damage area after impact,a 16.6%increase in compressive strength after impact,and a 34.4%reduction in impact pit depth.