The impact response and related failure behavior of a discontinuous polymer-polymer microlayer composite was investigated at different loading modes (in-plane and out-of-plane) at -40 °C. The microlayer composite was produced by extrusion blow-molding from a high density polyethylene (HDPE)-based blend containing modified polyamide (Selar RB, DuPont de Nemours Co.) at 7 wt %. This blow molding process `dispersed' the polyamide (PA) phase in the form of thin, discontinuous microlayers across the wall thickness. Specimens cut from this material were subjected to both instrumented high-speed impact bending (v = 3·7 m/s) and falling dart (v = 10 and 15 m/s) tests. In the former set-up (Charpy and Izod test configurations) the fracture mechanical concept was exercised, so that the fracture toughness and fracture energy of differently notched specimens could be evaluated. It was established that in-plane is superior to the out-of-plane resistance. Impact results treated as a function of the molding-induced microstructure indicated that both a uniform layer thickness and equal interlayer distances strongly improve the impact resistance of this polymer-polymer composite (PPC).
|Number of pages||7|
|Journal||Plastics, Rubber and Composites Processing and Applications|
|Publication status||Published - 1994|
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