Title: CAPILLARY EXTRUSION RHEOLOGY AND THERMAL STABILITY OF EVA/ORGANOMONTMORILLONITE NANOCOMPOSITES
Page Range: p.271-280
Author(s): Dazhu Chen; Weian Zhang; Pingsheng He
File size: 181K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 13
Issue No: No. 3
Abstract
EVA copolymer-based nanocomposites based on organomontmorillonite were prepared by melt compounding. A partially intercalated, partially exfoliated structure was revealed in the nanocomposites by X-ray diffraction and transmission electron microscopy. Attention was paid to the steady shear rheological properties of the nanocomposites via a capillary rheometer. It was found that an increased n temperature improved the flow properties, but decreased the pseudoplasticity of the melts. With increasing shear stress (or shear rate), the shear viscosity and flow activation energy dropped, while the extrudate swell ratio rose. The addition of organomontmorillonite led to a reduction in both the shear viscosity and swell ratio of the nanocomposites compared to the EVA matrix. The thermal stability of the EVA and EVA/organomontmorillonite nanocomposites was also examined by means of thermogravimetric analysis techniques. 31 refs.
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