Influence of processing route and conditions on the structure and properties of LDPE based polymer nanocomposites

Abstract - The effect of the processing route on the dispersion of an organically modified layered silicate (OMLS) in low density polyethylene (LDPE) has been investigated. The best solution for an easily applicable and economic process was the production of a polymer/filler concentrate (masterbatch) by melt blending. A lab scale medium shear twin screw extruder has been used and the influence of several processing set-ups (polymer/filler premixing, separate feeding of components) and process parameters (residence time, mixing energy) have been evaluated in order to optimize filler dispersion during masterbatch production. The relationships occurring between processing parameters, (specific mechanical energy, residence times) and nanocomposites structure investigated by direct (SEM, TEM) and indirect (thermal and mechanical properties) characterization techniques, have been assessed. Study results have been successfully scaled-up on industrial plant.