Liquid Processable, Thermally Stable, Hydrophobic Phenolic Triazine Resins for Advanced Composite Applications AITranslate

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DOI：https://doi.org/10.1021/acsapm.9b00212

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Composite structures are seeing demand for higher temperature performance, and thus there is a need for advanced resin systems to meet this requirement. Here a commercial phenolic triazine (PT) resin is combined with a blend of low-viscosity difunctional cyanate ester (Primaset LECy) to achieve a series of reactive binary systems. Throughout this work, the properties of the blends are compared against an industrial standard (Primaset PT-30). The thermomechanical performances of the cured blends compare favorably with the industrial standard system with the best performing systems exhibiting Tg values in excess of 300 °C, based on the drop in storage modulus (compared with a value of at least 350 °C for PT-30). After conditioning for 3127 h at 80 °C and 85% relative humidity (RH), a cured binary resin blend absorbed 4.9 wt % of moisture compared with a figure of 5.2 wt % for PT-30. When exposed to 250 °C in air continuously over a period of 3048 h, the best performing of the binary cured blends lose only 48.3% of their mass compared with 45.0% for PT-30 under the same conditions. The importance of this work is that the newly proposed resin blends containing 20–25 wt % LECy exhibit low viscosities (<1000 mPa·s) at 50 °C and are considerably more suitable for liquid composite molding processes when compared with the state-of-the-art commercial matrix, while showing improved moisture performance, with only minimal loss in thermal performance.