Recyclable polyurethane/nanoclay films

A series of polyurethane (PU)/clay nanocomposite films was prepared by adding natural bentonite Cloisite® Na + powders to waterborne polyurethane dispersions (PUDs) followed by a slow water evaporation; the nanoclay content in the films varied from 0 to 5 wt%. The functional properties of materials with low nanoclay loading (up to 1 wt%) resemble features of films prepared without any nanoclay. Compared to unfilled PU, the films with 3 and 5 wt%...