FARIAS, G. M. G.; Giselly M. G. Farias.; FARIAS, GISELLY M.G.; http://lattes.cnpq.br/5374756102252621; FARIAS, Giselly Marilaide Galdino.
Abstract:
The effect of EVA concentration and of VA content of EVA on the mechanical,
morphological and rheological properties of bio-based high density
polyethylene/ethylene vinyl acetate (BioPE/EVA) blends was investigated. The
blends were characterized by X-Ray Diffraction (XRD), Differential Scanning
Calorimetry, Scanning Electron Microscopy (SEM), and rheological
measurements under oscillatory shear flow. The degree of crystallinity of BioPE
decreased with the increase in the EVA concentration and was unaffected with
the increase in the VA content. DMTA results showed a decrease in the storage
modulus (E’) with the increase in EVA content and that the BioPE/EVA19
blends showed higher E’ values than BioPE/EVA28 blend. The impact strength
substantially increased with the addition of EVA concentration above 5% and
was higher for the blends containing the highest VA content. The blends
containing a higher content of VA exhibited the higher EVA dispersed phase
domains size, which increased with the increase in EVA concentration. The
complex viscosity increased with the increase in the EVA content, being higher
for the BioPE/EVA blends containing higher VA content. The storage modulus
increased, at low frequencies, with the increase in the EVA content and can be
ascribed to the increase in the EVA dispersed phase domains size.