Formulation of the epoxy composite samples.

Entry	Composite samples	Epoxy resin (g)	Hardener (g)	APP–PEI (g)	DOPO derivatives (g)
1	EP	7.56	3.24	—	—
2	EP/10APP–PEI	7.56	3.24	1.2	—
3	EP/10FR11	7.56	3.24	—	1.2
4	EP/5APP–PEI/5FR1	7.56	3.24	0.6	0.6
5	EP/5APP–PEI/5FR2	7.56	3.24	0.6	0.6
6	EP/5APP–PEI/5FR3	7.56	3.24	0.6	0.6
7	EP/5APP–PEI/5FR4	7.56	3.24	0.6	0.6
8	EP/5APP–PEI/5FR5	7.56	3.24	0.6	0.6
9	EP/5APP–PEI/5FR6	7.56	3.24	0.6	0.6
10	EP/5APP–PEI/5FR7	7.56	3.24	0.6	0.6
11	EP/5APP–PEI/5FR8	7.56	3.24	0.6	0.6
12	EP/5APP–PEI/5FR9	7.56	3.24	0.6	0.6
13	EP/5APP–PEI/5FR10	7.56	3.24	0.6	0.6
14	EP/5APP–PEI/5FR11	7.56	3.24	0.6	0.6
15	EP/5APP–PEI/5FR12	7.56	3.24	0.6	0.6
16	EP/5APP–PEI/5FR13	7.56	3.24	0.6	0.6
17	EP/5APP–PEI/5FR14	7.56	3.24	0.6	0.6
18	EP/5APP–PEI/5FR15	7.56	3.24	0.6	0.6
19	EP/5APP–PEI/5FR16	7.56	3.24	0.6	0.6