A resin matrix composition intended for producing a polymer composite material or prepregs for PCM, comprising: a polymerizable mixture comprising: - one or more bis-phthalonitrile monomers selected from monomers of the following general formula: where X, Y, Z are independently selected from the group consisting of H, F, Cl, Br, and CH 3, in an amount of 20 to 94 wt% of the polymerizable mixture; - one or more reactive plasticizers-fire retardants selected from compounds of the following general formula where group can be in either meta- or para- position relative to the oxygen atom bonded to the benzene ring, and R is selected from an aryl, oxyaryl, alkyl, or oxyalkyl group, or compounds of the following general formula where R is selected from an aryl, oxyaryl, alkyl, or oxyalkyl group, or the reactive platicizer-fire retardant being bis-(3-(3,4-dicyanophenoxy)phenyl)-propargylphosphate the reactive plasticizers-fire retardants comprising 5 to 80 wt% of the polymerizable mixture; and - one or more reactive diluents selected from compounds of the following general formula where R can be in meta- or para- position relative to the oxygen atom bonded to the benzene ring and is either H, CN, NH 2, or N(C 3 H 3) 2, the reactive diluents comprising 1 to 50% of a total weight of the polymerizable mixture; and a polymerization initiator (curing agent) comprising 1 to 20 wt% of the total weight of the polymerization mixture, the polymerization initiator selected from aromatic diamines or bisphenols with a boiling point of at least 180 °C at 0.1 mm Hg vacuum; wherein a total content of the polymerizable mixture and the polymerization initiator is 60 - 100 wt% of a total resin matrix weight of the resin matrix composition. a polymerizable mixture comprising: - one or more bis-phthalonitrile monomers selected from monomers of the following general formula: where X, Y, Z are independently selected from the group consisting of H, F, Cl, Br, and CH 3, in an amount of 20 to 94 wt% of the polymerizable mixture; - one or more reactive plasticizers-fire retardants selected from compounds of the following general formula where group can be in either meta- or para- position relative to the oxygen atom bonded to the benzene ring, and R is selected from an aryl, oxyaryl, alkyl, or oxyalkyl group, or compounds of the following general formula where R is selected from an aryl, oxyaryl, alkyl, or oxyalkyl group, or the reactive platicizer-fire retardant being bis-(3-(3,4-dicyanophenoxy)phenyl)-propargylphosphate the reactive plasticizers-fire retardants comprising 5 to 80 wt% of the polymerizable mixture; and - one or more reactive diluents selected from compounds of the following general formula where R can be in meta- or para- position relative to the oxygen atom bonded to the benzene ring and is either H, CN, NH 2, or N(C 3 H 3) 2, the reactive diluents comprising 1 to 50% of a total weight of the polymerizable mixture; and - one or more bis-phthalonitrile monomers selected from monomers of the following general formula: where X, Y, Z are independently selected from the group consisting of H, F, Cl, Br, and CH 3, in an amount of 20 to 94 wt% of the polymerizable mixture; - one or more reactive plasticizers-fire retardants selected from compounds of the following general formula where group can be in either meta- or para- position relative to the oxygen atom bonded to the benzene ring, and R is selected from an aryl, oxyaryl, alkyl, or oxyalkyl group, or compounds of the following general formula where R is selected from an aryl, oxyaryl, alkyl, or oxyalkyl group, or the reactive platicizer-fire retardant being bis-(3-(3,4-dicyanophenoxy)phenyl)-propargylphosphate the reactive plasticizers-fire retardants comprising 5 to 80 wt% of the polymerizable mixture; and where group can be in either meta- or para- position relative to the oxygen atom bonded to the benzene ring, and R is selected from an aryl, oxyaryl, alkyl, or oxyalkyl group, or compounds of the following general formula where R is selected from an aryl, oxyaryl, alkyl, or oxyalkyl group, or the reactive platicizer-fire retardant being bis-(3-(3,4-dicyanophenoxy)phenyl)-propargylphosphate the reactive plasticizers-fire retardants comprising 5 to 80 wt% of the polymerizable mixture; and - one or more reactive diluents selected from compounds of the following general formula where R can be in meta- or para- position relative to the oxygen atom bonded to the benzene ring and is either H, CN, NH 2, or N(C 3 H 3) 2, the reactive diluents comprising 1 to 50% of a total weight of the polymerizable mixture; and a polymerization initiator (curing agent) comprising 1 to 20 wt% of the total weight of the polymerization mixture, the polymerization initiator selected from aromatic diamines or bisphenols with a boiling point of at least 180 °C at 0.1 mm Hg vacuum; wherein a total content of the polymerizable mixture and the polymerization initiator is 60 - 100 wt% of a total resin matrix weight of the resin matrix composition.