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Polyolefin - Polyolefins are the largest group of
thermoplastics, often referred to as commodity thermoplastics, they are
polymers of simple olefins such as ethylene, propylene, butenes,
isoprenes, and pentenes, and copolymers and modifications thereof. The
term polyolefins means "oil-like" and refers to the oily or waxy feel
that these materials have. Polyolefins consist only of carbon and
hydrogen atoms and they are non-aromatic. Polyolefins are usually
processed by extrusion, injection molding, blow molding, and rotational
molding methods. Thermoforming, calendering, and compression molding are
used to a lesser degree. An inherent characteristic common to all
polyolefins is a nonpolar, nonporous, low-energy surface that is not
receptive to inks, and lacquers without special oxidative pretreatment.
The two most important and common polyolefins are polyethylene and
polypropylene and they are very popular due to their low cost and wide
range of applications.
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