离子络合物改性二维云母环氧树脂复合材料的制备及性能

Preparation and properties of two-dimensional mica epoxy resin composite modified by ion complex

为了实现环氧树脂(EP)的高性能化,将插层法得到的二维云母纳米片(MNs)与增韧型阻燃剂甲基膦酸-癸二胺离子络合物(MPA-DAD)复合,制备了一种环氧树脂多功能改性材料MNs@MPA-DAD。通过力学、UL-94、极限氧指数(LOI)、热重、锥形量热以及摩擦磨损等测试研究了MNs@MPA-DAD对环氧树脂复合材料的性能影响。结果表明:MPA-DAD中的离子键可充当牺牲键,耗散能量提升韧性。相较于纯EP,添加质量分数8%的MNs@MPA-DAD,环氧树脂复合材料的拉伸和弯曲韧性分别提高了302%和268%。二维的MNs可以作为物理屏障,抑制材料燃烧过程中热量和氧气的传递过程,与MPA-DAD协同发挥阻燃机制。EP/8%MNs@MPA-DAD的极限氧指数由纯EP的20.4%提高至28.9%,残炭率由8.9%提升至14.3%,UL-94测试通过了V-0级别,热释放速率峰值(PHRR)和总热释放(THR)分别降低了34.0%和19.7%。MNs@MPA-DAD能够产生均匀的润滑转移层,减少摩擦热的产生,避免熔化磨损,进而提高环氧树脂的耐磨性。EP/8%MNs@MPA-DAD的磨损面积较纯EP降低了76.6%。

In order to achieve high performance of epoxy resin(EP),two-dimensional mica nanosheets(MNs)obtained by intercalation method were combined with toughening flame retardant methyl phosphonate-decanediamine ionic complex(MPA-DAD),and a multifunctional EP modified material MNs@MPA-DAD was prepared.The influence of MNs@MPA-DAD on the properties of EP composites was investigated by mechanical test,UL-94,limiting oxygen index(LOI),thermogravimetric,cone calorimetric and friction and wear test.The results exhibited that the ionic bond in MPA-DAD can act as a sacrificial bond and dissipate energy to improve toughness.Compared with neat EP,the tensile and flexural toughness of EP composites increased by 302%and 268%,respectively,when 8%MNs@MPA-DAD was added.Two-dimensional MNs could be used as a physical barrier to inhibit the transfer of heat and oxygen in the combustion process of materials,and played a synergistic flame retardancy mechanism with MPA-DAD.The limiting oxygen index of EP/8%MNs@MPA-DAD was increased from 20.4%(neat EP)to 28.9%,and the residues at 800℃ was increased from 8.9%to 14.3%.UL-94 test passed the V-0 level,and the peak heat release rate(PHRR)and total heat release(THR)were reduced by 34.0%and 19.7%,respectively.MNs@MPA-DAD could produce a uniform lubricating transfer layer,reduced friction heat generation,avoided melting wear and improved the wear resistance of epoxy resin.The wear area of EP/8%MNs@MPA-DAD was 76.6%lower than that of neat EP.