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Dielectric analysis of the interfacial polarization of alkali treated woven flax fibers reinforced epoxy composites
Institution:1. Laboratoire des matériaux composites, polymères et céramiques, Faculté des Sciences de Sfax, Route Soukra, 3018, Tunisia;2. Unité de l''état solide, Faculté des Sciences de Sfax, Route Soukra, 3018, Tunisia;3. CIMAP, UMR6252 CNRS-CEA-ENSICAEN-Universit''é de Caen Basse-Normandie, F-14032, Caen, France;4. LAUM UMR CNRS 6613, École Nationale Supérieure d''Ingénieurs du Mans, Université du Maine, Av. O. Messiaen, F-72085, Le Mans, France;1. Department of Energy and Biotechnology, Energy and Environment Fusion Technology Center, Myongji University, Yongin, Gyeonggi-do 449-728, Republic of Korea;2. Research Institute for Physical Chemical Problems, Belarusian State University, Minsk 220030, Belarus;1. Department of Mechanical Convergence Engineering, Hanyang University, Haengdang-dong, Seongdong-gu, Seoul 133-791, Republic of Korea;2. Institute of Nano Science and Technology, Hanyang University, Seoul, 133-791, Republic of Korea
Abstract:Dielectric measurements were performed on alkali treated flax fibers reinforced epoxy composites in the frequency range 0.1 Hz–1 MHz and the temperature range 40–170 °C. Two common dielectric relaxations were observed for all composites. The first one appearing at low temperatures was attributed to the water dipoles polarization due to the hydrophilic character of flax fibers. The second one observed at high temperatures was identified to the interfacial polarization. Analysis of this latter using the Havriliak–Negami model showed an improvement of the fibers/matrix adhesion by these alkali treatments. The best adhesion was obtained by the leaching treatment.
Keywords:Laminates  Flax fibers  Dielectric relaxation  Adhesion
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