Abstract
Two novel benzoxazine monomers (Bra-1 and Bra-2) from rosin were synthesized and the highly thermally stable polybenzoxazines were obtained by the thermal cure of the corresponding benzoxazine monomers. The chemical structure of the monomers was confirmed by FTIR and 1H NMR spectra. FTIR and DSC showed that the monomers were thermally initiated and polymerized via ring-opening polymerization. Thermogravimetric analysis (TGA) indicated that the incorporation of rigid bulky hydrogenated phenanthrene ring and imide structure could enhance the char yield and thermal stability of polybenzoxazines.
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