Abstract
AbstractIn this work, Phthalonitrile containing benzoxazine (BA‐ph) and Bisphenol A based cyanate ester (CE) were chosen as the matrix resin. Various amount of nano‐SiO2 was incorporated into BA‐ph/CE and their glass fiber‐reinforced composite laminates were fabricated. Curing reaction and processability of BA‐ph/CE/SiO2 blends were studied by differential scanning calorimetry and dynamic rheological analysis. Results showed that BA‐ph and CE exhibited good processability and curing reaction of BA‐ph/CE was not obviously affected by SiO2. Scanning electron microscope images of the composites showed that SiO2 particles were well dispersed in BA‐ph/CE matrix. Moreover, SiO2 could act as physical crosslinking points and diluent in matrix as well as between the glass fibers to improve the mechanical properties of composite laminates. As the results of dynamic mechanical analysis and thermogravimetry analysis, composite laminates possessed satisfactory Tg and good thermal stability. With incorporation SiO2 particles into matrix resin, dielectric constant and dielectric loss of BA‐ph/CE/SiO2/GF composites were increased and showed frequency dependence.
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