Polybenzoxazines are an emerging class of thermosetting and crosslinking resins that display excellent properties such as high glass transition temperatures, low water absorption and flammability, near-zero volumetric cure shrinkage, and very good dielectric, thermal, and mechanical properties even at modest polymer molecular weights. Functionalizing BPA-based polybenzoxazines (PBA-a) with other polymers offers interesting opportunities for creating hybrid materials with stable, tuned physical, chemical, and mechanical properties. The high temperatures required for the thermal ROP of benzoxazines have in part contributed to the lack of widespread deployment of these resins into various industries. The solubility, crosslinking, and the macromolecular structure of cured blends of BPA-based benzoxazine (BA-a) monomers with functionalized polymers and particles are studied and compared to control materials. In some cases, BA-a monomer can be homogeneously dispersed in polymers with a wide loading range (∼50-100 wt.%). In telechelic polymer blends, the cure temperature for the ring-opening polymerization of BA-a can be up to 50 °C less than that of pure BA-a or other control materials. H-NMR and FTIR reveal that the resulting PBA-a is phenolic rich in molecular structure with H-bonded hydroxyl residues and that grafting to the functionalized polymer/particles results. The tuning of physical, thermal and mechanical properties of the graft copolymers with the blend composition is also discussed.

Hybrid polybenzoxazines with unique properties from cure-accelerated benzoxazine blends

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.