摘要
复合泡沫材料是一种广泛应用于海洋和航空航天领域的轻质复合材料。文章使用两种聚酰亚胺(PI)微粒,即含嘧啶环的杂环型聚酰亚胺(PI-1)和醚酐型聚酰亚胺(PI-2),对环氧树脂基体及复合泡沫材料进行改性,研究PI微粒对环氧树脂(EP)和复合泡沫材料压缩性能和微观结构的影响,探究两种PI对基体与空心玻璃微珠(HGMs)界面结合强度的影响,并对增强机理进行讨论。结果表明:当两种热塑性PI微粒的质量分数不超过6%时,在EP基体中分布均匀。PI微粒在预固化阶段发生溶解,随着交联网络的形成在基体中析出纳米级小颗粒。PI微粒的引入改善了HGMs与基体的界面结合,形成独特的微纳米混杂增强结构,有效阻碍了裂纹扩展,进一步提升了复合泡沫材料的压缩性能。尤其是PI-1的质量分数为6%时,在不增加密度的情况下,压缩强度提高至162.4 MPa,断裂韧性基本保持不变。
Composite foams are lightweight composites widely used in marine and aerospace fields.The article employs two types of polyimide(PI)microparticles,namely heterocyclic polyimide containing pyrimidine rings(PI-1)and ether anhydride polyimide(PI-2),to modify the epoxy resin matrix and composite foams.It investigates the effects of PI microparticles on the compressive properties and microstructure of epoxy resin(EP)and composite foams,explores the influence of the two types of PI on the interfacial bonding strength between the matrix and hollow glass microspheres(HGMs),and discusses the reinforcement mechanisms.The results show that when the mass fraction of the two thermoplastic PI microparticles does not exceed 6%,they are uniformly distributed in the EP matrix.The PI microparticles dissolve during the precuring stage and precipitate as nanoscale particles in the matrix with the formation of the crosslinked network.The addition of PI microparticles improves the interfacial bonding between HGMs and the matrix,forming a unique micro-nano-hybrid reinforcement structure that effectively hinders crack propagation and further enhances the compressive properties of composite foams.In particular,when the mass fraction of PI-1 is 6%,the compressive strength increases to 162.4 MPa without increasing the density,while the fracture toughness remains essentially unchanged.
作者
亚斌
丁兆俊
裴雷振
王鑫
周秉文
孟令刚
张兴国
YA Bin;DING Zhaojun;PEI Leizhen;WANG Xin;ZHOU Bingwen;MENG Linggang;ZHANG Xingguo(School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China;Ningbo Institute of Dalian University of Technology,Ningbo 315000,China)
出处
《塑料科技》
北大核心
2025年第9期1-7,共7页
Plastics Science and Technology
基金
中央高校基本科研业务费专项资金资助项目(DUT17RC(3)012)。
关键词
聚酰亚胺微粒
复合泡沫材料
空心玻璃微珠
压缩性能
混杂颗粒增强
Polyimide microparticles
Composite foams
Hollow glass microspheres
Compressive performance
Hybrid particle reinforcement
