基体厚向梯度化聚酰亚胺复合材料制备与表征  

Preparation and characterization of matrix-graded polyimide composite along thickness direction

作　　者：倪洪江 李军 邢宇 张代军 陈祥宝 NI Hongjiang;LI Jun;XING Yu;ZHANG Daijun;CHEN Xiangbao(Research Center of Soft Materials,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;National KeyLaboratory of Advanced Composites,Beijing 100095,China)

机构地区：[1]中国航发北京航空材料研究院软材料技术研究中心,北京100095 [2]先进复合材料国防科技重点实验室,北京100095

出　　处：《航空材料学报》2022年第3期55-62,共8页Journal of Aeronautical Materials

基　　金：中国科协青年人才托举工程(2019QNRC001);国家科技重大专项(2017-Ⅶ-0011,J2019-Ⅵ-0013);国家自然科学基金(51803201)。

摘　　要：研制树脂传递模塑成型(RTM)用聚酰亚胺树脂基体RTM-PI,采用RTM工艺制备基体厚向梯度化聚酰亚胺复合材料,提升复合材料热稳定性能。基体梯度化复合材料包括RTM-PI树脂基芯层和高热稳定树脂基表层,RTM成型工艺参数基于树脂升温热失重、流变和固化反应数据确定。结果表明:RTM-PI树脂兼具低黏度、超长工艺适用期和耐高温性能,最低黏度在0.1 Pa·s以下,工艺期在300 min以上,玻璃化转变温度达到445℃;基体厚度梯度化复合材料内部质量优异,350℃热老化100 h的失重相对纯RTM-PI复合材料可降低48%以上。A resin-transfer-molding(RTM) polyimide resin,RTM-PI,was developed,and the matrix-graded polyimide composite along thickness directions was fabricated with RTM processing.The matrix-graded composite was composed of surface layers with polyimide matrix having high thermal stability,and core layers with RTM-PI matrix.The RTM processing parameters were established based on thermogravimetry,rheology and curing data of PI resins.The results show that RTM-PI resin exhibits the properties of low viscosity,super long processable time,and high thermal resistance.The lowest viscosity is below 0.1 Pa· s,processable time is longer than 300 min,and glass-transition-temperature reaches 445 ℃.The internal quality of the matrix-graded polyimide composite along thickness direction is excellent,and the reduction of mass loss after the thermal ageing at 350 ℃ for 100 h is more than 48% lower than that of the pure RTM-PI composite.

关 键 词：基体厚向梯度化 聚酰亚胺 复合材料 树脂传递模塑成型 热稳定性 

分 类 号：V258[一般工业技术—材料科学与工程]