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采用Hummers方法制备了氧化石墨烯(GO),并通过扫描电镜(SEM)和原子力显微镜(AFM)对GO微观形貌进行了表征.详细研究了GO与硅磷低聚物(DMS-DOPO)在环氧树脂(EP)力学性能和阻燃性能中的协同作用.万能材料试验测试结果表明,GO和DMS-DOPO分别对拉伸强度和断裂伸长率提高效果明显,二者协同后,可使EP拉伸强度和断裂伸长率分别提高17.1%和42.2%.采用热重分析(TG)、极限氧指数(LOI)、垂直燃烧(UL-94)、锥型量热(CONE)和SEM对EP及其阻燃材料的热性能、燃烧性能以及炭层微观形貌进行了表征.EP/DMS-DOPO/GO在600℃残留量为EP的5.2倍,比EP/DMS-DOPO和EP/GO分别提高4.4%和208.6%.EP/DMS-DOPO/GO的LOI值大于30,并能通过UL-94 V-0级别,燃烧过程中可形成内部结构疏松多孔、外表面致密的膨胀炭层.DMS-DOPO和GO协同后使EP热释放速率峰值由1154 k W·m-2降低到710 k W·m-2,总烟释放量降低30%.
The graphene oxide (GO) was prepared by the Hummers method and characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The effects of GO and silicophosphate oligomer (DMS-DOPO) Epoxy resin (EP) and flame retardant properties of the synergistic effect of universal material test results show that, GO and DMS-DOPO, respectively, on the tensile strength and elongation at break significantly improve the effect of the two can be coordinated EP tensile strength and elongation at break increased by 17.1% and 42.2%, respectively. The thermal gravimetric analysis (TG), limiting oxygen index (LOI), vertical combustion (UL- EP and its flame-retardant materials were characterized by SEM, TEM and TEM.The residual amount of EP / DMS-DOPO / GO at 600 ℃ was 5.2 times that of EP / DMS-DOPO and EP / GO Respectively, increased by 4.4% and 208.6%, respectively.The LOI of EP / DMS-DOPO / GO was greater than 30 and passed the UL-94 V-0 rating, resulting in the formation of expanded porous charcoal with dense outer surface during combustion. The synergism between DMS-DOPO and GO decreased the peak value of EP heat release rate from 1154 k W · m-2 to 710 k W · m-2, and the total smoke emission decreased by 30%.