Abstract
In this study, the main focus has been to analyse the improvement of the nonwoven Alfa fibers adhesion in unsaturated polyester matrix, taking into account their mechanical consolidation conditions and their hybridization treatments with either wool fibers or wool and thermo-binder fibers. Hence, dielectric measurements were investigated on four hybrid composites so as to probe the interfacial region. Analyses of the interfacial polarization by means of the Havriliak–Negami model have revealed a better fiber–matrix adhesion for hybridization-treated Alfa fibers with wool fibers where needle punching was used twice. This adhesion was improved further with the addition of thermo-binder fibers to wool fibers in a relative volume fraction of 2:1. This analysis was accomplished by a thorough study of the fiber–matrix interfacial adhesion aspect using a differential scanning calorimeter, Fourier transform infrared spectroscopy, and a scanning electron microscope.
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