Reactive Monomers for Polybenzoxazine Synthesis Affecting Flame Retardancy and Curing Temperature

The present dissertation covers the development of new polybenzoxazine-based crosslinked polymers. To be precise, new polybenzoxazines will be obtained by either synthesizing new monomers and their polymerization or by combining additives with a bisphenol F based benzoxazine as reference (BF-a). Additionally, it is of high interest to improve th thermo-mechanical properties as well as the flame retardancy (FR) of polybenzoxazines. Sesamol and different diamines are used to develop new monomers with improved thermo-mechanical properties, whereas organo-phosphorous groups are covalently incorporated into the benzoxazine moiety both by developing a new flameretardant monomer or by using FR additives. Four of the additives exhibit phenolic hydroxyl groups that can both initiate and partake during the polymerization. A non-reactive additive does not initially contain a free phenolic hydroxyl group. However, during the polymerization process of benzoxazines a transesterification reaction with lastly mentioned additive can take place, which yields free phenolic hydroxyl groups. Therefore, the additive gets also covalently incorporated into the polybenzoxazine network.