Self termination of ring opening reaction of<i>p</i>-substituted phenol-based benzoxazines: An obstructive effect<i>via</i>intramolecular hydrogen bond
The ringopening polymerizations of p-substituted phenol-basedbenzoxazines are self-terminated as soon as dimers form. The polymerization of benzoxazine monomers does not proceed according to the theoretical mechanism even though the conditions, temperature, molar ratio, solvent polarity, and reactant ratio are varied. The speculated mechanism, involving the unique structure of a dimer with inter-