Abstract
The rheology and dispersion behavior of ethylene‐vinyl acetate (EVA) copolymer/TiO2 masterbatches prepared by melt‐compounding were investigated. The pure EVA exhibits obviously pseudoplastic behavior and the apparent viscosity decreases remarkably at experimental temperatures, especially in the range of 100–500 s−1. The EVA/TiO2 masterbatches exhibit similar shear rheology behavior with pure EVA and the apparent viscosities are obviously higher than that of pure EVA when the TiO2 content is above 10 wt.%. Field‐emission scanning electron microscopy (FE‐SEM) and energy dispersive x‐ray spectroscopy (EDX) show that relatively low TiO2 loading and moderate shear rate are helpful for the improvement of dispersion behavior of TiO2 nanoparticles; moreover, the dispersion behavior of TiO2 greatly influences the melt viscosity. The extensional rheology of pure EVA decreases with increasing extension rate, especially at low melt temperatures. EVA/TiO2 masterbatches have similar extensional rheology behavior as pure EVA and the TiO2 loading has almost no influence on the extensional viscosity of materbatches.
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