Dynamic Mechanical Analysis of Eva/PVC/Clay Nanocomposites Obtained Using a Twin-Screw Extruder (original) (raw)

2011

of clays were used: Na + , 15A and 30B. The dynamic mechanical properties were analyzed using a DMA Analyzer 2980. The storage modulus show higher values for the samples containing the organophilic clays, mainly in the glassy region. These results were better visualized calculating the storage modulus retention. The loss modulus show lower energy dissipation for the nanocomposite containing 15A clay and this can be indicative of a strong interface between matrix/reinforcement and/or a better dispersion promoting more interface regions, when compared to the others clays. The glass transition (Tg) show a shift to higher temperatures with incorporation of 15A and 30B nanoclays indicating more thermal energy to begin the cooperative motion. Also, by integrating the tan delta curve was obtained the peak width at half-height and the peak width of the samples. The results show lower values for the sample 15A for both analyses and, this can be indicative of a more homogeneous system in comp...

Studies on Morphology, Physical and Mechanical Properties of EVA/Clay Nanocomposites

Key Words nanocomposite, ethylene vinyl acetate, nanoclay, morphology, rheology Polymerization Quarterly, 2014 Volume 4, Number 2 Pages 4-20 I n the last two decades, some studies have been conducted on the preparation and properties of nanocomposites based on ethylene vinyl acetate copolymer (EVA) and nanoclay particles. The results indicate that the addition of small amounts of nanoclay into and hardness of the nanocomposites. When the percentage of nanoclay increases, zero shear viscosity of the nanocomposite increases, the Newtonian region becomes shorter and the material reveals shear thinning behavior at lower shear rates in comparison with that of the parent polymer. The factors such as the type and amount of nanoclay as well as and mechanical properties of their corresponding nanocomposites. The aim of this study is to present some information on the above nanocomposites by reviewing the most recent published papers on their various aspects of preparation and general propert...

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