High char yield polybenzoxazines are obtained from acetylene-functional benzoxazine monomers. Polymerization of acetylene functional group, in addition to oxazine ring opening polymerization, contributes greatly to the exceptional thermal stability. A significant change in char yield is found for these polybenzoxazines by different polymerization environments. The polymerization behaviour of these compounds under air and nitrogen atmosphere has been studied by Fourier transform infra-red spectroscopy, ultra-violet–visible spectroscopy, differential scanning calorimetry and proton nuclear magnetic resonance spectroscopy.
Посилання на статтю:
Molecular characterization of the polymerization of acetylene-functional benzoxazine resins / Hyun Jin Kim, Zdenka Brunovska, Hatsuo Ishida // Polymer. – 1999. – N 40. – P. 1815–1822.