Thermal properties comparison of hybrid CF/FF and BF/FF cyanate ester-based composites
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Insights within thermal expansion, conductivity, and decomposition dependencies with temperature on symmetrical and unsymmetrical layered carbon (CF) or basalt (BF) fabrics in combination with flax fibers (FF) were approached. Driven by commercial application and environmental concerns, the paper draws attention on a modified formula of cyanate ester with a common epoxy resin under an optimized ratio of 70:30 (vol%) as well as on the hybrid reinforcements stacking sequences. Synergetic effects were debated in terms of the CF and BF stacking sequences and corresponding volume fraction followed by comparisons with values predicted by the deployment of hybrid mixtures rules (RoHM/iRoHM). CF hybrid architectures revealed enhanced effective thermophysical properties over their BF counterparts and both over the FF-reinforced polymer composite considered as a reference. Thermal conductivities spread between 0.116 and 0.299 W m−1 K−1 from room temperature up to 250 °C on all hybrid specimens, giving rise to an insulator character. Concerning the coefficient of thermal expansion, CF hybrid architectures disclosed values of 1.236 10−6 K−1 and 3.102 10−6 K−1 compared with BF affine exhibiting 4.794 10−6 K−1 and 6.245 10−6 K−1, respectively, with an increase in their volume fraction.
KeywordsCarbon fiber Basalt fiber Flax fiber Hybrid architecture Cyanate ester resin Thermal properties
The corresponding author gratefully acknowledges the financial assistance of German Academic Exchange Service—DAAD that enabled and supported the internship with Fraunhofer Research Institution for Polymeric Materials and Composites—PYCO, Germany. Many thanks go to Dr. Christian Dreyer and Dr. Maciej Gwiazda for the resin formula and access to the composite manufacturing technology.
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