ma502336j_si_001.pdf (110.52 kB)
Study on the Ring-Opening Polymerization of Benzoxazine through Multisubstituted Polybenzoxazine Precursors
journal contribution
posted on 2015-02-10, 00:00 authored by Meng Wei Wang, Ru Jong Jeng, Ching Hsuan LinTo
discuss the mechanism of ring-opening polymerization (ROP) of
benzoxazine, a bisphenol A/diaminodiphenylmethane-based polybenzoxazine
precursor (PBz-0M), o-dimethylbisphenol A/diaminodiphenylmethane-based
polybenzoxazine precursor (PBz-2M), and o-dimethylbisphenol
A/o-tetramethyldiaminodiphenylmethane-based polybenzoxazine
precursor (PBz-6M) were prepared. Among the polybenzoxazine precursors,
free ortho positions to the O of oxazine are available for PBz-0M.
No free ortho or para position to the O of oxazine is available for
PBz-2M, but free ortho position to the N of oxazine is available.
No free ortho positions to the O or N of oxazine are available for
PBz-6M. According to DSC, IR, and thermal analysis, we found that
the ROP of PBz-2M can be carried out even though no free ortho or
para position to the O of oxazine is available. We conclude that the
ROP is carried out through the ortho position to the N of oxazine
and propose a reaction mechanism to explain the polymerization.