Copolymer is composed of two different types of monomers joined in the same polymer chain. The molecular structure of a polymer consists of a large number of similar molecules or monomers bonded together into long chains. Copolymer can be alternating copolymer, random copolymer, block copolymer or graft copolymer.
Polyethylene (PE) is made from the monomer ethylene and when copolymerized with an alkyl branched monomer a copolymer called linear low density polyethylene (LLDPE) is formed.
Trenchlesspedia Explains Copolymer
Polyvinyl chloride (PVC) and PE are monomers while high density polyethylene (HDPE) is a thermoplastic polymer. Polypropylene (PP) is a random copolymer known as PP-R and is used for high temperature pressure piping in plumbing, and industrial and food grade piping. Polypropylene random copolymer with modified crystallinity and temperature resistance (PP-RCT) for high temperature and pressure rated applications.
PP can be either a copolymer (PPC) or a homopolymer (PPH). PPC is tougher and more durable, has better stress crack resistance and toughness at low temperatures. PPH is stiffer and stronger, has better chemical resistance and resistance to corrosion.