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joseph lister first used as an antiseptic in 1870 polymer formed from many small molecules that combine to one large molecule monomer small molecules polymer or macro molecule large molecules plastics polymers are known as polyethylene simpliest polymer CH2=CH2... monomer molecules indicates that chain can go on indefinetly by adding more high density polymers have crystalline structure very hard and rigid low density polymer form in branced chains branching prevents crystal structure from forming semi rigid themoplastic materials plastics that can be heated and remodeled unreactive most polymers are unreactivity makes it very useful