Abstract
A combined processing scheme is used to develop polyurethane (PU) coatings with a nanoclay in three different weight percentages (1, 3 and 5 wt %). TEM of polymer-nanoclay suspensions shows exfoliation, intercalation and even agglomeration of clay layers. XrD studies also indicate expansion in gallery spacing of nanoclay layers in PU coatings. Improvement in scratch and mar resistance occurs, although the gloss values are reduced to some extent. Coating properties show improvement with addition of less than 3wt% clays.
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