This research was targeted to investigate the effect of oxygen plasma treated graphene nanosheets (tGNSs) on the thermal stability of benzoxazine resin and to have a further and deeper mechanistic understanding of thermal decomposition kinetics of such nanocomposites in 0.5, 1 and 3 wt% of tGNS. The samples were prepared as reported in our previous study. The quality of dispersion of tGNSs within benzoxazine was investigated by X-Ray diffraction (XRD) and scanning electron microscopy (SEM) technique. Also, to ensure the complete curing of samples the differential scanning calorimetry (DSC) analysis was performed. Using thermogravimetric analysis (TGA), it was found that the addition of tGNS improved the char yield and thermal stability parameter of benzoxazine nanocomposites and this improvement was more prominent at 1% and higher amount of nanoparticles. Moreover, the first stage of thermal degradation kinetic of benzoxazine was disappeared above 1 wt% of tGNS. The samples were kinetically analyzed through Kissinger, Flynn-Wall-Ozawa and Friedman and Coats-Redfern method. It was revealed that the overall activation energy was enhanced from 168 to 224 kJ mol⁻¹ and 275 to 420 kJ mol⁻¹ for the second and third stage of degradation using 1 and 3 wt% of tGNS.

这项研究旨在研究氧等离子体处理的石墨烯纳米片（tGNS）对苯并恶嗪树脂的热稳定性的影响，并进一步深入了解这种纳米复合材料在0.5、1和3 wt％的tGNS中的热分解动力学。 。按照我们先前的研究报告制备样品。通过X射线衍射（XRD）和扫描电子显微镜（SEM）技术研究了tGNS在苯并恶嗪中的分散质量。另外，为确保样品完全固化，还进行了差示扫描量热法（DSC）分析。使用热重分析（TGA），发现添加tGNS改善了苯并恶嗪纳米复合材料的炭收率和热稳定性参数，并且该改善在1％和更高的纳米颗粒量下更显着。此外，苯并恶嗪的热降解动力学的第一阶段在tGNS的1wt％以上消失。通过Kissinger，Flynn-Wall-Ozawa和Friedman和Coats-Redfern方法对样品进行动力学分析。结果表明，总活化能从168 kJ mol增加到224 kJ mol使用1和3 wt％的tGNS，在第二和第三降解阶段的^-1和275至420 kJ mol ^-1。