A novel siloxane-imide-containing polybenzoxazine based on N,N -bis(N-phenyl-3,4-dihydro-2H-benzo[1,3]oxazine)-5, 5 -bis(1,1 ,3,3 -tetramethyldisiloxane-1,3-diyl)-bis(norborane-2,3-dicarboximide) (BZ-A1) was successfully synthesized. The thermal properties of BZ-A1 are superior to those of conventional polybenzoxazines lacking siloxane groups. Polymerized BZ-A1 possesses extremely low surface free energy (γ s = 15.1 mJ m −2 ) after curing at 230 • C for 1 h. Moreover, the surface free energy of polymerized BZ-A1 is more stable than conventional bisphenol A-type polybenzoxazine during thermal curing and annealing processes, indicating that polymerized BZ-A1 is more suitable for applications requiring low surface free energy materials for high temperatures over long periods of time.

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