Hydroxy-terminated hyperbranched polyesters have been processed with sodium montmorillonite using water as a dispersant. Exfoliated composites were obtained at up to 10 wt % montmorillonite and successfully employed as precursors for glassy polyurethane nanocomposites. The figure is a TEM micrograph of a second pseudo-generation hyperbranched polymer/10 wt % Na+MMT nanocomposite.
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Plummer et al. (2002) studied this question.
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