10 research outputs found
Thermal properties comparison of hybrid CF/FF and BF/FF cyanate ester-based composites
[EN] 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.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.Motoc, DL.; Ferrándiz Bou, S.; Balart, R. (2018). Thermal properties comparison of hybrid CF/FF and BF/FF cyanate ester-based composites. Journal of Thermal Analysis and Calorimetry. 133(1):509-518. https://doi.org/10.1007/s10973-018-7222-yS5095181331Assarar M, Zouari W, Sabhi H, Ayad R, Berthelot J-M. Evaluation of the damping of hybrid carbon–flax reinforced composites. Compos Struct. 2015;132:148–54.Duc F, Bourban PE, Plummer CJG, MĂĄnson JAE. Damping of thermoset and thermoplastic flax fibre composites. 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