FLOW OF HIGHLY FILLED THERMOPLSTIC-DISPERSED ELASTIC FILLER COMPOSITIONS

Flow of the compositions based on LDPE and rubber powders of various d ispersity made of used tires was studied, It is shown that the rheolog ical properties of PE melts containing a disperse elastic filler are g overned by the concentration and the size (surface area) of the filler particles. The viscosity of the composition melt depends on the hydro dynamic effect caused by the filler particles, the adsorption interact ion at the polymer-filler interface, and the percolation structure for med by the particles. It was established that compositions containing dispersed elastic filler retain their ability to viscous flow without changes in the phase state of the components within a wide range of fo rmulations (up to 90 wt % filler). The rheological properties of a giv en system are determined both by the viscous flow of polymeric matrix and the pseudoplastic properties of a disperse filler (rubber powder).