AUTHOR=Zhang Kan , Ishida Hatsuo 

TITLE=Smart Synthesis of High-Performance Thermosets Based on ortho-Amide–Imide Functional Benzoxazines

JOURNAL=Frontiers in Materials

VOLUME=2

YEAR=2015

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2015.00005

DOI=10.3389/fmats.2015.00005

ISSN=2296-8016

ABSTRACT=<p>High-performance thermosets via amide–imide functional benzoxazine resins as precursors have been synthesized. The structures of synthesized monomers have been confirmed by <sup>1</sup>H NMR and Fourier transform infrared. Among these two benzoxazine monomers, the <italic>ortho</italic>-amide–imide functional benzoxazine resin shows powerful features both in the synthesis of benzoxazine monomers and the properties of the corresponding thermosets. For the cross-linked poly(amide-co-imide) based on <italic>ortho</italic>-amide–imide functional benzoxazine, a smart route is adopted to develop a more thermally stable cross-linked poly(benzoxazole-co-imide). Besides, the poly(benzoxazole-co-imide) can also undergo a further thermal treatment to form polybenzoxazole. Furthermore, a main-chain type <italic>ortho</italic>-functional polybenzoxazine with amide-co-imide and benzoxazine groups as repeating units has also been prepared. Both the <italic>ortho</italic>-amide–imide functional benzoxazine and main-chain type polybenzoxazine resins show the possibility to form high-performance thermosets with low cost and easy processability.</p>