Microstructure Related Fracture Behavior of a Discontinuous Polymer-Polymer Microlayer Composite
The fracture behavior of a discontinuous microlayer polymer-polymer composite was studied at −40 °C on notched Charpy specimens and unnotched plates in instrumented impact bending and falling weight impact tests, respectively. The microstructure of the specimens, containing discontinuous layers of modified polyamide (PA; Selar®, Du Pont), more or less uniformly stacked and well overlapping, in a high-density polyethylene (HDPE) matrix, was assessed by light microscopy. Failure mode of the microlayered specimens was studied by fractography. It was concluded that the in-plane impact response of this discontinuous microlayer composite is superior to the out-of-plane one. In addition, a fine and regular microstructure imparts to a high impact resistance.