Materials 09 51 g003 1024

Poly Ethylene vinyl acetate


Cover imageAmorphous phase mobility is studied for poly(ethylene-vinyl acetate) copolymers.

Fragility is constant from PVAc to EVA50 while cooperativity size reduces.

New extrapolated and fragility values tend to be proposed for PE.

Fragility and cooperativity aren't influenced because of the exact same macromolecular properties.

The segmental dynamics of amorphous poly(ethylene-vinyl acetate) copolymers (from PVAc to EVA50) were studied. Because sample ready with comparable anchor rigidity and various level of dipoles, the dynamic cup transition ended up being investigated by Modulated Temperature Differential Scanning Calorimetry and Broadband Dielectric Spectroscopy dimensions. A decrease of the cooperativity length scale was gotten using the plastic acetate (VAc) content decreasing. Having said that, there clearly was no customization associated with heat dependence of the relaxation time. Hence, the fragility value is quite continual whatever the VAc content. These outcomes show that fragility and cooperativity have actually two various beginnings. An extrapolation to nonconstrained polyethylene amorphous period ended up being suggested and new cup transition heat and fragility values had been determined.

Keywords

  • Amorphous phase;
  • Dynamic cup transition;
  • Poly(ethylene-vinyl acetate)


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