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Ece, Costa E. Silva
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Publications (4/4 displayed)
- 2018Compatibilization effect of organophilic clays in PA6/PP polymer blendcitations
- 2018Layered clays in PP polymer dispersion: the effect of the processing conditionscitations
- 2018Dispersion of the Organoclay C15A Along the Screw Profile: Using TEM to Compare PP N anocomposites Thickness
- 2017Mechanical Properties of PA6/PP Compatibilized Nanocomposites Using a Twin Screw Extruder
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document
Dispersion of the Organoclay C15A Along the Screw Profile: Using TEM to Compare PP N anocomposites Thickness
Abstract
Thermomechanical stress levels have a positive impact on dispersion of layered material by extrusion process. In order to contribute to the knowledge of this process, in previous work, PP nanocomposites were laboratory melted in a co-rotating twin-screw extruder by changing the processing conditions: screw profile and speed, temperature and output. Samples of PP nanocomposite material were collected on-line along the screw for subsequent study through characterization techniques. More precisely, X-ray diffraction (XRD), rheology, transmission electron microscopy (TEM) and mechanical properties were evaluated. In this work, we discuss the influence of the processing conditions on layers dispersion in PP/PP-g-MA matrix at two positions along the screw axis (at 11 and 32 L/D). TEM is a particularly useful technique since its images provide a detail view of layers dispersion of nanoclay on polymeric materials as PP/PP-g-MA, thus helping to clarify the distributive and dispersive processes. The behavior of the nanoclay thickness found by using the TEM images is studied along the screw. Parametric and non-parametric samples tests were used to infer whether the differences found at 11 and 32 LID are statistically significant. The results show a statistically significant reduction of the thickness for almost all the conditions.