Synthesis and performance enhancement of novel polybenzoxazines with low surface free energy

A new siloxane‐imide‐containing benzoxazine, BZ‐A6, has been successfully synthesized. The thermal properties of the polybenzoxazine (PBZ) prepared from BZ‐A6 (PBZ‐A6) are superior to those of conventional PBZs lacking siloxane groups. The normally brittle PBZs are toughened significantly as a result of adding siloxane‐imide moieties. Moreover, the thermal and UV stabilities of the surface free energy of PBZ‐A6 are dramatically improved over the conventional bisphenol‐A‐type PBZ. Siloxane‐imide PBZs are more suitable for application as low‐surface‐free‐energy materials that are highly resistant to temperature and UV radiation. PBZ‐A6 may also be useful in weather‐resistant and self‐cleaning coating materials because of its low surface free energy and good thermal and UV resistance. Copyright © 2011 Society of Chemical Industry A new siloxane‐imide‐containing benzoxazine, BZ‐A6, has been successfully synthesized. The thermal and UV stabilities of the surface free energy of PBZ‐A6 are dramatically improved over the conventional bisphenol‐A‐type PBZ.