Dependence of the Dynamic Mechanical Properties and Structure of Polyurethane-Clay Nanocomposites on the Weight Fraction of Clay

The effect of clay and chemical cross-linking on the dynamic mechanical properties polyurethane reinforced with different concentrations organically modified montmorillonite is investigated in this study. matrix constituted polytetrahydrofuran soft segment 4,4′-methylenebis(phenyl isocyanate) hard segment. Glycerin was used as crosslinking agent, while Cloisite 30B reinforcing filler. nanocomposites containing up to 1 wt.% showed a uniform dispersion clay; however, higher presence heterogeneities. Dynamic spectroscopy, DMS revealed that between 2 10 had two glass transition temperatures, Tg,1 Tg,2. higher-temperature temperature, Tg,2 increased increasing concentration, low-temperature decreased concentration. low only one temperature narrow region. crosslink density for clay.