Abstract
The complex effect of nanoparticles on an epoxy-based and anhydride cured DGEBA/Boehmite nanocomposite with different particle concentrations is considered in this chapter. A combination of X-ray scattering, calorimetry (fast scanning and temperature modulated calorimetry) and dielectric spectroscopy was employed to characterize the structure, vitrification kinetics and the molecular dynamics of the nanocomposites. Firstly, the unfilled polymer was found to be intrinsically heterogeneous, showing regions with different crosslinking density, indicated by two separate dynamic glass transitions. Moreover, the glass transition temperature decreases with increasing nanoparticle concentration, as a result of changes in the crosslinking density. In addition, it was shown that the incorporation of nanoparticles can result in simultaneous increase in the number of mobile segments for low nanoparticle concentrations and on the other hand, for higher loading degrees the number of mobile segments decreases, due to the formation of an immobilized interphase.
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Szymoniak, P., Qu, X., Schönhals, A., Sturm, H. (2021). Characterization of Polymer Nanocomposites. In: Sinapius, M., Ziegmann, G. (eds) Acting Principles of Nano-Scaled Matrix Additives for Composite Structures. Research Topics in Aerospace. Springer, Cham. https://doi.org/10.1007/978-3-030-68523-2_4
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