Benzoxazines are currently thought as promising precursors for high performance thermosets, surpassing phenol or epoxy resins in term of thermal and mechanical properties, chemical resistance and fire retardancy. Furthermore, polybenzoxazine resins stem from a thermally-induced auto-catalysed ring-opening polymerization of benzoxazine monomers, avoiding thus the use of strong acid-catalysts and/or the formation of by-products. Nevertheless, the need for petroleum-based phenolic reagents to synthetize benzoxazine monomers constitutes major hindrance to the successful spreading of polybenzoxazines thermosets in industrial processes. Circumventing the non-renewable phenolic derivatives drawback, a new generation of bio-based benzoxazines made from vanillin were recently synthetized. However, their processing (molding and shaping) still remains problematic owing to a high melting temperature, overlapping the onset of ring-opening polymerization.<br/>In order to tackle these issues, we propose to influence on melting temperatures and gelation times by the use of bio-based phenolic derivatives, cardanol together with vanillin, through an original synthesis of new unsymmetric benzoxazine monomers. The resulting monomers are exhibiting large difference between melting and polymerization temperatures, as well as low gelations time. Cardanol was considered from a preliminary study as bio-based phenolic compound for the design of di-functionnal benzoxazine monomers with low melting temperatures. We will highlight our findings in this presentation.

New insights in bio-based benzoxazines

251st National Meeting (2016)

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