Dynamic Mechanical and Thermal Stability of a Novel Resin Transfer Molding Matrix Derived from Blend of Benzoxazine and Polyarylacetylene

摘要

Polybenzoxazine, as a class of thermosetting phenolic resins, offer a number of attractive properties, such as high glass transition temperature, high thermal stability, high char yield, good mechanical properties, and a great deal of flexibility in molecular design compared to ordinary phenolics.[1-3] In addition, they do not produce byproducts during curing and no catalysts are needed[4]. To further enhance the thermal properties of polybenzoxazine, benzoxazine monomers with reactive functional groups, such as acetylene functional groups, nitrile etc, were synthesized, because oligomers and polymer containing acetylenic groups can be polymerized into three-dimensional void-free networks under moderate conditions, and these polymer show solvent resistance, moisture resistance, and excellent thermo-oxidative stability[5-7]. However, a drawback is that these benzoxazine monomers possess high melting temperature, solid state at room temperature, hampers processability, and cannot be used for RTM process. In previous studies, much research works have been focused on the modification of resins with high melting temperature through copolymerizing with various reactive diluents or comonomers.[8,9]