The industrial world has an enormous appetite for polyolefines, and consumption in the US alone now exceeds 25 billion lbs each year. The widespread use of these materials is driven by a very favourable cost/performance relationship, but they cannot be classified as engineering thermoplastics as their strength and modulus values are modest at best. The surface of polyolefine parts is easily marred, modulus performance declines with any increase in temperature, the impact strength of some grades falls rapidly as temperature decreases, and in the absence of reinforcing fibres, polyolefines do not have a good tolerance of mechanical loading.
They do, however, offer some excellent property values for potential contribution to an alloy. These desirable features include cost, density, processability, chemical resistance, filler tolerance, flame retardancy options, and effective interaction with reinforcing fibres.
The general …
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