{TAIL ~ Exemplary types} of polymers include polystyrenes, polyvinyl chlorides, polyesters, polyethylene terephthalates, low density polyethylenes, polypropylenes, {HEAD ~ apolyamides}, acrylonitrite butadiene styrenes, polycarbonates, polycarbonate/acrylonitrite butadiene styrene blends, polyurethanes, melamine formaldehydes, plastics, and elastomeric plastics 
{ TAIL ~ Exemplary types } of polymers include polystyrenes , polyvinyl chlorides , polyesters , polyethylene terephthalates , low density polyethylenes , polypropylenes , { HEAD ~ apolyamides } , acrylonitrite butadiene styrenes , polycarbonates , polycarbonate / acrylonitrite butadiene styrene blends , polyurethanes , melamine formaldehydes , plastics , and elastomeric plastics
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