A novel flame-retardant, polysilazane containing phosphorus (PPVSZ), was synthesised and used as flame-retardant to prepare glass fibre reinforced flame-retardant modified epoxy composites (GFRP-M). With the incorporation of PPVSZ, GFRP-M exhibited excellent thermal stability and the limited oxygen index values of GFRP-M/2.5 (GFRP-M with 2.5 wt-% of PPVSZ) and GFRP-M/5.0 (GFRP-M with 5.0 wt-% of PPVSZ) increased from 33.9% (GFRP-M/0.0, GFRP-M without PPVSZ) to 42.8 and 43.2%, respectively. Besides, GFRP-M/2.5 and GFRP-M/5.0 could also reach UL-94 V-0 rating. Furthermore, the tensile, flexural, and impact strength of GFRP-M/2.5 was improved by 30.2, 17.8, and 65.5%, respectively, indicating that the incorporation of PPVSZ had good effect on mechanical properties of GFRP-M. The obtained results showed that GFRP-M exhibited satisfactory flame retardancy and mechanical properties because of the incorporation of PPVSZ.
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