The present invention relates to a phosphazene compound and a composite metal laminate. The phosphazene compound with a partial structure of carboxylic esters has a structure as shown in Formula (I). The present invention obtains a phosphazene compound with a partial structure of carboxylic esters using an M group having specific components. The cured products of the phosphazene compound have good flame retardancy, heat resistance, mechanical properties, flame retardancy, and low dielectric constant, and are a low dielectric flame retardant material having great economic properties and being environmental friendly.

The phosphazene covalent organic framework (COF) is a material with high efficiency to improve the removal of iodine from nuclear waste. The COF can be obtained by a solvothermal reaction of hexa (4-formyl-phenoxy)cyclotriphosphazene and 1,3,6,8-tetra(aminophenyl)pyrene. The resulting three-dimensional phosphazene COF has iodine uptakes as high as 9.4 g g.sup.1 due to its 3D framework with higher specific surface areas and interconnected channels.

The phosphazene covalent organic framework (COF) is a material with high efficiency to improve the removal of iodine from nuclear waste. The COF can be obtained by a solvothermal reaction of hexa (4-formyl-phenoxy)cyclotriphosphazene and 1,3,6,8-tetra(aminophenyl)pyrene. The resulting three-dimensional phosphazene COF has iodine uptakes as high as 9.4 g g.sup.1 due to its 3D framework with higher specific surface areas and interconnected channels.

The phosphazene covalent organic framework (COF) is a material with high efficiency to improve the removal of iodine from nuclear waste. The COF can be obtained by a solvothermal reaction of hexa(4-formyl-phenoxy)cyclotriphosphazene and 1,3,6,8-tetra(aminophenyl)pyrene. The resulting three-dimensional phosphazene COF has iodine uptakes as high as 9.4 g g.sup.1 due to its 3D framework with higher specific surface areas and interconnected channels.

The phosphazene covalent organic framework (COF) is a material with high efficiency to improve the removal of iodine from nuclear waste. The COF can be obtained by a solvothermal reaction of hexa(4-formyl-phenoxy)cyclotriphosphazene and 1,3,6,8-tetra(aminophenyl)pyrene. The resulting three-dimensional phosphazene COF has iodine uptakes as high as 9.4 g g.sup.1 due to its 3D framework with higher specific surface areas and interconnected channels.

A material with the empirical formula C.sub.3N.sub.3P is made by polymerizing P(CN).sub.3 in a polar aprotic solvent such as acetonitrile, by heating, irradiation with ultraviolet light, and/or using a polymerization initiator and/or a catalyst.

A material with the empirical formula C.sub.3N.sub.3P is made by polymerizing P(CN).sub.3 in a polar aprotic solvent such as acetonitrile, by heating, irradiation with ultraviolet light, and/or using a polymerization initiator and/or a catalyst.

The phosphazene covalent organic framework (COF) is a material with high efficiency to improve the removal of iodine from nuclear waste. The COF can be obtained by a solvothermal reaction of hexa(4-formyl-phenoxy)cyclotriphosphazene and 1,3,6,8-tetra(aminophenyl)pyrene. The resulting three-dimensional phosphazene COF has iodine uptakes as high as 9.4 g g.sup.1 due to its 3D framework with higher specific surface areas and interconnected channels.

The phosphazene covalent organic framework (COF) is a material with high efficiency to improve the removal of iodine from nuclear waste. The COF can be obtained by a solvothermal reaction of hexa(4-formyl-phenoxy)cyclotriphosphazene and 1,3,6,8-tetra(aminophenyl)pyrene. The resulting three-dimensional phosphazene COF has iodine uptakes as high as 9.4 g g.sup.1 due to its 3D framework with higher specific surface areas and interconnected channels.