Abstract:

Comb-branched water-borne polyurethane/montmorillonite (CWPU/MMT) nanocomposites were prepared using comb-branched polymeric diols and montmorillonite as raw materials by in-situ intercalating polymerization. The effect of the structure of MMT in CWPU matrix on the mechanical properties, heat-resistance and water-resistance of CWPU/MMT nanocomposites was studied. Na⁺ -MMT was aggregated in CWPU matrix, which had no influence on the mechanical properties and heat-resistance of nanocomposites and reduced the water-resistance of nanocomposites.2T-MMT and C₁₈-MMT were distributed uniformly with intercalated and exfoliated layers into the CWPU matrix, which results in obvious improvement of mechanical properties, heat-resistance and water-resistance of nanocomposites.2T-MMT was more effective than C₁₈-MMT for the modification on CWPU.