▎ 摘　　要

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 gravimetric analysis (TG),limiting oxygen index (LOT), 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 degrees 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.