氧化石墨烯与Si-P低聚物在环氧树脂中的协同阻燃作用  

Synergetic Flame Retardant Effect of Graphene Oxide and Si-P Oligomer in Epoxy

作　　者：赵春霞[1] 邓利民[2,3] 黄志宇[2] 

机构地区：[1]西南石油大学材料科学与工程学院,成都610500 [2]西南石油大学化学化工学院,成都610500 [3]四川省安全科学技术研究院,成都610045

出　　处：《高分子学报》2015年第4期382-389,共8页Acta Polymerica Sinica

基　　金：四川省教育厅面上项目(项目号11ZB021);西南石油大学校级科技基金(基金号2012XJZ036)资助

摘　　要：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%.Graphene oxide （GO） was prepared via Hummers＇ method,and its micromorphology was detected by scanning electron microscopy （SEM） and atomic force microscopy （AFM）. The synergetic effects of GO and Si-P oligomer （DMS-DOPO） on flame retardant and mechanical properties of EP were studied in detail. Universal testing results showed that GO and DMS-DOPO had good effect on tensile strength and elongation at break,respectively. Tensile strength and elongation at break of EP were enhanced by 17.1% and 42.2% synergistically effected by GO and DMS-DOPO. Thermal and flame properties of EP and its composites were measured through thermal gravimetrie analysis （TG）, limiting oxygen index （LOI）, vertical burning test （UL- 94） and cone calorimeter （CONE）. The micromorphology of char residual was observed by SEM. The char residual amount of EP/DMS-DOPO/GO was 5.2 times that of EP at 600 ~C , and 4.4% higher than that of EP/DMS-DOPO,208% for EP/GO. EP/DMS-DOPO/GO could pass UL-94 V-0 level, and its LOI value was over 30. Intumescent char layer with polyphorous inner structure and compact outside surface was formed during the combustion of EP/DMS-DOPO/GO. The heat release rate （HRR） of EP reduced from 1154 kW·m^-2 to 710 kW· m^-2 due to synergistical flame retard and effect of DMS-DOPO and GO. Total smoke production （TSP） of EP/DMS-DOPO/GO was 30% lower than that of EP.

关 键 词：氧化石墨烯 协同阻燃 环氧树脂 锥型量热 

分 类 号：O633.13[理学—高分子化学]