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 in end-group functionalized polymers are studied and compared to control materials. In some cases, BA-a monomer can be homogeneously dispersed in polymers with a wide loading range (∼40-100 wt. %). In tosylate-end group 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. TGA-FTIR and TGA-MS are used to detect tosylate-based accelerants for cure of the BA-a monomer. H-NMR and FTIR reveal that the PBA-a is phenolic rich in molecular structure with H-bonded hydroxyl residues and grafted polymer-chains from the end-group functionalized polymer. The tuning of physical, thermal and mechanical properties of the graft copolymers with the blend composition is also discussed.

Toughened graft copolymer blends from the accelerated thermal ring opening polymerization and crosslinking of benzoxazine monomers by end-group functionalized polymers

2019 Fall National Meeting

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