Publications by authors named "Evagelia Kontou"
Article Synopsis
- The study focuses on a viscoelastic model that captures various loading types like creep-recovery and stress relaxation using the same parameters, making it easier to analyze viscoelastic behavior over different time scales.
- The model's relaxation function incorporates a distribution function tied to energy barriers that molecular domains must overcome under stress, which plays a crucial role in the analysis and can be derived from experimental results of the loss modulus master curve.
- The research successfully predicts key properties like creep compliance and relaxation modulus for poly-lactic acid (PLA) and demonstrates that the model can also extend to predict experimental data for PLA/hybrid nanocomposites without needing extra parameters.
In the present work, SiOmicro/nanocomposites based on poly-lactic acid (PLA) and an epoxy resin were prepared and experimentally studied. The silica particles were of varying sizes from the nano to micro scale at the same loading. The mechanical and thermomechanical performance, in terms of dynamic mechanical analysis, of the composites prepared was studied in combination with scanning electron microscopy (SEM).
View Article and Find Full Text PDFTwo series of polymer nanocomposites (PNCs) based on amorphous styrene-butadiene rubber (SBR) and semicrystalline linear low-density polyethylene (PE) matrices were filled with 2-15 wt% carbon nanotubes (CNT) and were studied by employing calorimetry, dielectric spectroscopy and laser flash analysis. The electrical conductivity, σ, increased with CNT loading and similar values were exhibited for the two matrices, uniquely depending on the concentration of the CNTs, suggesting practically no effects of the crystalline fraction (CF) on σ. For both types of matrix, a fraction of the polymer was found to be immobilized (rigid amorphous fraction, RAF).
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