Long- and short-term creep of polyoxymethylene/polyurethane/alumina ternary composites by comparison

Ternary composites consisting of polyoxymethylene, polyurethane (PU), and boehmite alumina were produced by melt blending with and with out latex precompounding. The latex precompounding served to predisperse the alumina particles. The related advanced masterbatch (MBa) was produced by mixing the PU latex with the water-dispersible boehmite alumina. The dispersion of alumina and rubber particles was studied by using the scanning electron micros copy. The creep properties of the composites were determined from results of long- and short-term creep tests (per formed at various temperatures). The composites produced by the MBa technique out performed those made by direct melt compounding with respect to most of creep characteristics. The Findley power law was found to be fairly applicable to the experimental results obtained. Master curves (strain vs. time) were also constructed by employing the time-temperature super position principle.