Rheological behavior of hyperbranched polymer/montmorillonite clay nanocomposites

The equilibrium rheological properties of a range of isotropic exfoliated and intercalated hyperbranched polymer (HBP)/montmorillonite (MMT) clay nanocomposites have been investigated using low strain oscillating shear measurements at temperatures above the glass transition temperature of the HBP. Predominantly exfoliated nanocomposites showed a sharp increase in shear viscosity at about 0.8 wt % MMT, associated with a transition from Newtonian to solid-like behavior, which was characterized in terms of a limiting shear modulus at low frequencies and a limiting viscosity at high frequencies, both of which were strongly dependent on the MMT content. Intercalated HBP/organically modified MMT nanocomposites showed qualitatively similar behavior, but the increase in viscosity with MMT content was far weaker. This was argued to reflect a significantly lower effective particle aspect ratio than in the exfoliated nanocomposites.

Publié dans:
Journal of Rheology, 48, 5, 1049-1065

 Notice créée le 2006-06-26, modifiée le 2019-12-05

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