Low-k, flame-retardant, bi-functional benzoxazine and method for making the same

1. A method for making a low-k, flame-retardant, bi-functional benzoxazine including the steps of:

dissolving phosphoric diamine with various functional groups, phenolic adamantane and paraformaldehyde in a solvent at 72° C. to 88° C. for 7 to 9 hours; and

cooling and introducing the solution in n-hexane to separate the low-k, flame-retardant, phosphoric, bi-functional benzoxazine that exhibits a structural formula as follows:

wherein, R1 to R3 are selected from the group consisting of the hydrogen atom, C1 to C6 alkyl, C3 to C6 naphthene and phenyl.

2. The method according to claim 1 , wherein the solvent is selected from the group consisting of DMAC/toluene, NMP/toluene, DMSO/toluene, DMAC/xylene, NMP/xylene, DMSO/xylene, ethanol/toluene, ethanol/xylene, methanol/toluene and/or methanol/xylene, wherein toluene or xylene is used as a hydrophobic solvent.

3. The method according to claim 1 , wherein the phosphoric bi-functional benzoxazine is mixed with the epoxy, i.e., diglycidyl ether bi-sphenol A for copolymerization in molten state without using any solvent, wherein the concentration of the phosphoric bi-functional benzoxazine is 0.1 mole % to 50 mole %.

4. The method according to claim 3 , wherein the copolymerization temperature is the room temperature to 250° C.

5. The method according to claim 3 , wherein the copolymerization temperature is 160° C. to 220° C.

6. The method according to claim 3 , wherein the copolymerization time is 5 to 24 hours.

7. The method according to claim 3 , wherein the copolymerization time is 6 to 16 hours.