长时耐300℃易成型聚酰亚胺树脂及其复合材料  

Processable polyimide resins and their composites for long-term application at 300℃

作　　者：胡海 孟祥胜 柯红军 王献伟 李显明 龚狄荣[1] 王震 Hai HU;Xiangsheng MENG;Hongjun KE;Xianwei WANG;Xianming LI;Dirong GONG;Zhen WANG(School of Materials Science and Chemical Engineering,Ningbo University,Ningbo 315021,Zhejiang,China;Laboratory of Polymer and Composite Materials,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,Zhejiang,China;Zhejiang Qinghe Advanced Material Technology Co.,Ltd.,Taizhou 318000,Zhejiang,China;Aerospace Institute of Special Materials and Technology,Beijing 100074,China)

机构地区：[1]宁波大学材料科学与化学工程学院,浙江宁波315021 [2]中国科学院宁波材料技术与工程研究所高分子与复合材料实验室,浙江宁波315201 [3]浙江清和新材料科技有限公司,浙江台州318000 [4]航天特种材料及工艺技术研究所,北京100074

出　　处：《材料工程》2023年第9期183-191,共9页Journal of Materials Engineering

基　　金：浙江省重点研发计划(2021C01126)。

摘　　要：以苯炔基苯酐为封端剂,异丙醇为酯化试剂和溶剂,采用原位聚合法合成一系列耐高温、易成型聚酰亚胺树脂。所制备的聚酰亚胺树脂溶液在室温下储存16周依然没有固体析出,且溶液黏度没有明显变化,显示出较好的室温储存稳定性。树脂低聚物的最低熔体黏度<300 Pa·s,显示出良好的熔体流动性和工艺窗口,适合模压或热压罐工艺。树脂固化物的玻璃化转变温度最高可达462℃,具有很好的耐热性能。T300/PMR-PE-2碳纤维复合材料室温弯曲强度为963 MPa,弯曲模量为53.0 GPa,层间剪切强度为56 MPa,300℃下其力学性能保持率≥66%。300℃等温热氧老化500 h后,复合材料的热失重仅为0.96%,室温弯曲强度保持率为72%,层间剪切强度保持率高达98%,具有优异的抗热氧老化性能。A series of processable and high-temperature resistant polyimide resins terminated with 4-phenylethynyl phthalic anhydride were synthesized by PMR(for in situ polymerization of monomer reactants)using isopropyl alcohol as esterifying agent.The resin solution stored at room temperature for sixteen weeks has no solid precipitation,and the viscosity of the solution does not change significantly,which shows good storage stability at room temperature.The minimum melt viscosity of the imide oligomers is less than 300 Pa·s,which is suitable for compression moulding or autoclaved process.The cured polyimides exhibit extremely high glass transition temperatures(Tg)up to 462℃.The flexural strength and modulus of T300/PMR-PE-2 carbon fiber composite are 963 MPa and 53 GPa,respectively.The inter-laminar shear strength of the composite is 56 MPa.Moreover,the composite can maintain no lower than 66%of their room temperature mechanical properties at 300℃.After isothermal aging in air atmosphere for 500 h at 300℃,the mass loss of the composite is only 0.96%,meanwhile,the composite retention rate maintains 72%of its room temperature flexural strength and 98%of its room temperature inter-laminar shear strength,which demonstrates its excellent thermal-oxidative aging resistance.

关 键 词：易成型 耐高温 聚酰亚胺树脂 碳纤维复合材料 等温老化 

分 类 号：TB332[一般工业技术—材料科学与工程]