LAUSR

Abstract Flexible polyurethane foams (FPUs) having polystyrene (PS) stabilized by silica gel or polystyrene-acrylonitrile (SAN) particles were synthesized employing polymer polyether polyols (PPPs). The filler and its content effect on physical, mechanical and thermal properties of FPUs were studied. The FPU thermal stability increased with PS content into PPP and no interaction filler-polymeric network was observed. Meanwhile, FPUs containing PS as filler were more thermally stable and mechanically resistant -except the elongation-than those from the commercial PPP containing SAN. Contrary to porosity and cell size, the density and hardness are function of the filler type and increase with the filler content although the hardness is practically constant from 10 wt%. Closed cell foams instead of tight foams were produced from filler contents higher than 15 wt%. Synthesized FPUs presented better hardness and density properties but worse mechanical properties than the commercial one. Finally, mechanical properties were similar than FPUs containing inorganic fillers.