PREPARATION AND CHARACTERIZATION OF PERLITE-FILLED HIGH-DENSITY POLYETHYLENES .2. THERMAL AND FLOW PROPERTIES

Thermal and flow properties of perlite-filled high-density polyethylen es (HDPE), studied in the first part of the paper, are discussed. Maxi mum peak temperatures of endotherms (T-mp) and the corresponding relat ive peak heights were examined by differential scanning calorimetry (D SC). The data obtained from a Brabender torque rheometer were evaluate d to find the melt viscosities at low shear rate during preparation of perlite-HDPE composites. The filler concentration, types of HDPEs, an d the use of gamma-APS are found to be effective and influential facto rs on the thermal and flow properties of these composites. (C) 1994 Jo hn Wiley and Sons, Inc.