Influence of screw speed on the mechanical and rheological properties of poly(ethylene-co-vinyl acetate)-organomodified montmorillonite nanocomposites

Poly(ethylene‐co‐vinyl acetate) (EVA) and organophilic montmorillonite clay nanocomposites were manufactured in a co‐rotating twin‐screw extruder using screw speeds ranging between 200 and 800 rpm. The morphology and thermal‐mechanical and rheological properties were studied to establish processing–...

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Bibliographic Details
Published in:Polymer composites 2015-05, Vol.36 (5), p.854-860
Main Authors: Pistor, Vinicius, Covas, José A., Zattera, Ademir José
Format: Article
Language:English
Subjects:
Acetates
Assessments
Clay (material)
Ethylene vinyl acetates
Montmorillonite
Nanocomposites
Rheological properties
Screws
Storage modulus
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Summary:Poly(ethylene‐co‐vinyl acetate) (EVA) and organophilic montmorillonite clay nanocomposites were manufactured in a co‐rotating twin‐screw extruder using screw speeds ranging between 200 and 800 rpm. The morphology and thermal‐mechanical and rheological properties were studied to establish processing–morphology–property relationships. Particularly for samples produced under higher screw speed ranges, X‐ray diffraction and transmission electron microscopy revealed a tendency of increased exfoliated clay. Although the mechanical properties improved by the presence of clay, they were not altered by the screw speed. The rheological behavior in the solid and melt states were evaluated and showed that the storage modulus of neat EVA subjected to higher screw speed undergoes more pronounced decrease in the storage modulus than the nanocomposites, suggesting that the clay minimizes the effect of the screw speed. This minimization effect could be explained in the light of the assessment of relaxation times that showed stronger physical interactions with the nanocomposites in the molten state. POLYM. COMPOS., 36:854–860, 2015. © 2014 Society of Plastics Engineers
ISSN:0272-8397
1548-0569
DOI:10.1002/pc.23004