Copolymer - A mixture of two polymers. It may be composed of two bifunctional units and may alternate to give a well-defined recurring unit or the two different monomers may be joined in a random fashion in which no recurring unit can be defined. A copolymer contrasts with a homopolymer . No one ever calls PET a copolymer. Linear polymer - a straight chain species, i.e., the units are connected to each other in a chain arrangement.
Linear polymer contrasts with branched polymer and crosslinked polymer.
Monomer - the building block or structural unit of the polymer. A homopolymer contrasts with a copolymer . D.P. values can be as high as 10,000. Please contact me if you are aware of any polymers which can be synthesized with higher D.P. values. Crosslinkage - The formation of crosslinks.