Influence of physical interaction between organoclay and poly(ethylene-co-vinyl acetate) matrix and effect of clay content on rheological melt state

Influence of physical interaction between organoclay and poly(ethylene-co-vinyl acetate) matrix and effect of clay content on rheological melt state

In this study nanocomposites of poly(ethylene-vinyl acetate) (EVA) and organophilic montmorillonite clay (OMMT) (0, 2, 5 and 10 phr) were prepared. The nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), parallel pla...

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Bibliographic Details
Published in:Polymer (Guilford) Vol. 51; no. 22; pp. 5165 - 5171
Main Authors: Pistor, V., Lizot, A., Fiorio, R., Zattera, A.J.
Format: Journal Article
Language:English
Published: Kidlington Elsevier Ltd 15-10-2010
Elsevier
Subjects:
Acetates
Applied sciences
Clay (material)
Composites
Creep (materials)
Ethylene vinyl acetates
EVA
Exact sciences and technology
Forms of application and semi-finished materials
Nanocomposites
OMMT
Polymer industry, paints, wood
Rheological properties
Rheometry
Stress relaxation
Technology of polymers
OMMT
Nanocomposites
EVA
Viscoelasticity
Organic clay
Molten state
Montmorillonite
Dispersion degree
Mechanical properties
Experimental study
Thermal stability
Relaxation spectrum
Morphology
Concentration effect
Nanocomposite
Rheological properties
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Summary:In this study nanocomposites of poly(ethylene-vinyl acetate) (EVA) and organophilic montmorillonite clay (OMMT) (0, 2, 5 and 10 phr) were prepared. The nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), parallel plate rheometry and mechanical analysis. Oscillatory rheometry provided relaxation and retardation spectra, and the stress relaxation modulus and the creep compliance curves were obtained using the nonlinear regularization (NLREG) program. The results showed that 2 phr of OMMT were not sufficient to promote dispersion and exfoliation of the clay, although in the form of clay tactoids it had a catalytic effect on the degradation of EVA. The OMMT content had a strong influence on the thermal stability of chain segments containing vinyl acetate (VAc). The rheological study showed that at 5 phr there were substantial changes in the viscosity and energy dissipation of the sample, suggesting that at above 2 phr the nanocomposites become more stable leading to changes in the creep and viscoelastic properties of the material. The addition of OMMT promoted significant gains in terms of the mechanical properties, and thus a study on the clay content and flow behavior was carried out. [Display omitted]
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2010.08.045