DOPO-HQ改性碳纳米管/EP复合材料的制备及性能

Preparation and Properties of MWCNTs Modified with DOPO-HQ/EP Composites

采用混酸氧化多壁碳纳米管(MWCNTs),然后与含磷化合物2–(6,H–二苯并<c,e><l,2>–5–氧杂–6–膦酰杂–6–苯基)–1,4–对苯二酚(DOPO-HQ)反应,对MWCNTs进行功能化修饰,并用功能化的碳纳米管(MWCNTs-P)对环氧树脂进行改性.对比了MWCNTs与MWCNTs-P对环氧树脂力学性能和阻燃性的影响,结果表明,MWCNTs与MWCNTs-P的加入均能提高环氧树脂的力学性能,MWCNTs-P改性效果更好.当MWCNTs-P添加量为0.5%时,环氧树脂的冲击强度提高了232%;SEM结果显示,加入碳纳米管使环氧树脂复合材料的韧性有一定程度的提高.MWCNTs-P的添加量为1.0%时,复合材料的拉伸性能和弯曲性能最好.极限氧指数(LOI)测试结果表明,MWCNTs-P提高了环氧树脂的阻燃性,MWCNTs-P的添加量为0.5%时,复合材料的LOI达到30.2%.

Multi-walled carbon nanotubes（MWCNTs）were oxidized with mixed acid,and then were functionized with phosphorus-containing compound 2-（6-oxido-6 H-dibenz 〈 c , e 〉 〈 1 , 2 〉 oxa phosphorin-6-yl）-1 , 4-dihydroxy phenylene （DOPO-HQ）. The functionalized carbon nanotubes （MWCNTs-P） were used to modify epoxy resin. The effects of MWCNTs and MWCNTs-P on the mechanical properties and the flame retardancy of the epoxy resin were compared. The results showed that both MWCNTs and MWCNTs-P can improve the mechanical properties of the epoxy resin, while the modification effect of MWCNTs-P was better. When the MWCNTs-P content was 0.5%, the impact strength of the epoxy resin increased by 232%. SEM images showed that the addition of carbon nanotubes improved the toughness of the epoxy resin. The tests of tensile properties and bending performance of the composites indicated that the best content of MWCNTs- P was 1.0%. Limiting oxygen index （LOI） test revealed that MWCNTs-P can improve the flame retardancy of the epoxy resin, and when MWCNTs-P content was 0.5%, the LO1 reached to 30.2%.