Benzoxazine monomer (named as B-aptes) was synthesized from 3-aminopropyltriethoxysilane (KH-550), bisphenol A (BPA), and paraformaldehyde. Subsequently, functionalized halloysite nanotubes were obtained by introducing B-aptes onto the surface of halloysite nanotubes (HNTs). Then, benzoxazine-modified halloysite nanotubes (B-HNTs) were used to combine with BPA epoxy resin to prepare the diglycidyl ether of bisphenol-A (DGEBA)/B-HNTs composites. The homogeneous dispersion state of modified HNTs in the cured composite matrix was observed by scanning electron microscopy. Differential scanning calorimetry was used to investigate polymerization behaviors of ternary composites. The results showed that the ternary composite possessed lower polymerization temperature compared with the neat DGEBA/benzoxazine. According to the results of thermogravimetric analysis, the thermal stability of DGEBA/benzoxazine copolymers was improved by the modified HNTs, the char yield increased with the increase of HNTs mass ratio. The results of mechanical tests and dynamic mechanical analysis displayed that the DGEBA/B-HNTs composites possessed promoted mechanical properties.

中文翻译：

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苯并恶嗪改性埃洛石纳米管的制备及其在环氧/苯并恶嗪复合材料中的应用

苯并恶嗪单体（命名为 B-aptes）由 3-氨基丙基三乙氧基硅烷 (KH-550)、双酚 A (BPA) 和多聚甲醛合成。随后，通过将 B-aptes 引入到埃洛石纳米管 (HNTs) 的表面上，获得了功能化的埃洛石纳米管。然后，将苯并恶嗪改性的埃洛石纳米管（B-HNTs）与BPA环氧树脂结合制备双酚A（DGEBA）/B-HNTs复合材料的二缩水甘油醚。通过扫描电子显微镜观察改性HNTs在固化复合基体中的均匀分散状态。差示扫描量热法用于研究三元复合材料的聚合行为。结果表明，与纯 DGEBA/苯并恶嗪相比，三元复合材料具有较低的聚合温度。热重分析结果表明，改性HNTs提高了DGEBA/苯并恶嗪共聚物的热稳定性，炭产率随着HNTs质量比的增加而增加。力学测试和动态力学分析结果表明，DGEBA/B-HNTs 复合材料具有提升的力学性能。