Morphology and Strength of Die-Drawn Porous Sheets from Highly Filled Polypropylenes

摘要

Highly oriented porous sheets can be produced from solid phase die drawing of polymer composites below the melting temperature. Talc filled polypropylenes with two different grades of talc having different particle size distributions and different mean particle sizes at the same filler loading of 50 wt% or 23 vol% were drawn in the solid phase through a converging die at 128°C. The highest draw speed that could be achieved at 128°C for the composite with the lower mean particle size was twice the maximum speed that could be achieved with the other composite. The higher maximum draw speed for the composite with a greater fraction of smaller particles may be attributed to greater tensile strength during drawing from the reinforcement provided by the undebonded particles.