Dynamics of model polycyclic aromatic hydrocarbon compound-epoxy composites: A dielectric study

A model polycyclic aromatic hydrocarbon (PAH) compound, anthracene, was incorporated into a thermosetting epoxy matrix as a reinforcing moiety via physical dispersion and/or chemical modification. In order to understand the "additive effect" of glass transition temperature (Tg) observed with the variation of free anthracene (AN) and bonded 2-aminoanthracene (2-AM) loading, the relaxation dynamics were investigated by broadband dielectric spectroscopy. Within the measurement range of 0.01 Hz-1 MHz and -60 to 130 degrees C, three relaxation processes, namely normal mode (n-mode) relaxation, a relaxation, and beta relaxation, were observed for all epoxy composites with bonded and/or unbound anthracene. After eliminating the strong effect of ionic conduction by using the logarithmic derivative approximation epsilon" (sic) partial derivative epsilon'/partial derivative In omega, derived from the Kramers-Kronig relations, the n-mode relaxation occurring at low frequencies above T-g for the rigid epoxy system is revealed. The Arrhenius diagram showing the temperature dependence of each relaxation process for the PAH-epoxy composites was obtained after parametric fitting using the Havriliak-Negami (HN) function in the frequency domain. The segmental a relaxation was more strongly impacted than the long-range n-mode relaxation by the different reinforcing approaches. The correlation of T-g -scaled fragility to molecular structures reveals the different mechanisms for the retardation effects on cooperative segmental and chain relaxation time. The localized b relaxation below Tg was not seemingly affected by the incorporation of bound and/or unbound anthracenes as indicated by the characteristic relaxation time and the activation energy. (c) 2017 Elsevier Ltd. All rights reserved.