Novel Latent Catalyst for Ring-Opening Polymerization of 1,3-Benzoxazines Triggered by a Dual Ionic/Non-ionic Monomer Partnership

We report unraveling the catalytic effect of N-activated benzoxazine monomers on the ring-opening polymerization of simple 1,3-benzoxazine. A novel series of ionic and neutral benzoxazine monomer couples were synthesized and thoroughly characterized using cutting-edge X-ray and spectroscopic techniques. Specially designed monomers act as latent catalyst systems that remain dormant at room temperature but become activated during heating. This two-stage process involves the detachment of chloroalkane and the opening of the oxazine ring, significantly reducing the ROP temperature. To shed new light on the catalytic performance of ionic monomers, simultaneous Fourier transform infrared and thermogravimetry measurements were conducted, providing a comprehensive understanding of the thermal transformation products and revealing the immense catalytic potential and effectiveness of ionic benzoxazines.