Time-resolved X-ray imaging of nanofiller-polyurethane reactive foam systems

► Nanofiller-polyurethane foaming process is examined by time-resolved X-ray imaging. ► Density, cell size and cell density evolution are quantified during PU foam expansion process. ► The presence of nanofillers produce a significant enhancement in the nucleation mechanism reducing cell size and increasing cell density. ► Polyurethane foaming kinetics is affected by nanofillers addition.