Influence of material modification and fillers on the dimensional stability and warpage of polypropylene in screw?extrusion?based large area additive manufacturing

In this work, the influence of a modification and fillers on dimensional stability warpage semi-crystalline polypropylene compounds in screw-based Large Area Additive Manufacturing is investigated by material characterization experimental testing. Polypropylene modified blending an amorphous polyolefin-copolymer as well addition three different talc, glass fibers, hollow beads, resulting eight compounds. A using Differential Scanning Calorimetry, Thermogravimetric Analysis, thermal conductivity measurements, pvT-measurements carried out. Experimental investigations regarding deformation during processing are performed. By increasing crystallization temperature from 112.3°C 0.208 W/(m°C) to 127°C 0.232 through use better reached. Furthermore, both base introduction talc or fibers lead significant reduction decrease specific volume cooling, determined pvT-measurements, thus reducing warpage. The experimentally could be reduced 69% when 10 wt. % talc-filler 78% compared unmodified unfilled polypropylene.