In this work, multiwalled carbon nanotubes (MWCNT) were oxidized in a mixture of sulfuric and nitric acid (3:1 v/v) using two distinct times (9 and 18 hours). The effects of different oxidation levels and concentrations of MWCNT on curing kinetics, thermal, and mechanical properties of bisphenol A diglycidyl ether nanocomposites were studied. The nanocomposites were produced using in situ polymerization technique at two different volume fractions (0.15% and 0.50% v/v) without using solvents. X‐ray photoelectron spectroscopy results indicated that MWCNT were in fact oxidized and just 9 hours of acid treatment showed a greater amount of oxygen on the MWCNT surfaces. Results of differential scanning calorimetry and dynamic mechanical analysis showed small variations in the glass transition temperatures of the nanocomposites, indicating alterations in the quality of the interphase matrix/carbon nanotubes. Concerning the thermogravimetric analysis results, the most thermally stable samples were those containing 0.15% v/v of pristine and 18 hours of oxidized MWCNT, which also had the highest stiffness of all nanocomposites. Finally, the cure kinetics of nanocomposites is fairly represented by Kamal and Sourour's semiempirical model with an autocatalytic behavior at 100°C and 120°C, but decelerated at 140°C.

中文翻译：

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多层碳纳米管的氧化时间对环氧基纳米复合材料的热，机械和固化动力学的影响

在这项工作中，使用两个不同的时间（9和18小时）在硫酸和硝酸的混合物（3：1 v / v）中氧化了多壁碳纳米管（MWCNT）。研究了不同氧化水平和浓度的多壁碳纳米管对双酚A二缩水甘油醚纳米复合材料固化动力学，热学和力学性能的影响。纳米复合材料是使用原位生产的聚合技术在两个不同的体积分数（0.15％和0.50％v / v）下不使用溶剂。X射线光电子能谱分析结果表明，MWCNT实际上已被氧化，仅经过9小时的酸处理，MWCNT表面上的氧气量就增加了。差示扫描量热法和动态力学分析的结果表明，纳米复合材料的玻璃化转变温度有很小的变化，表明相间基质/碳纳米管的质量发生了变化。关于热重分析结果，最热稳定的样品是包含0.15％v / v的原始样品和18个小时的氧化MWCNT的样品，它们也具有所有纳米复合材料中最高的硬度。最后，Kamal and Sourour'相当地代表了纳米复合材料的固化动力学。