Monomer arrangement in copolymers Polymer

monomers within copolymer may organized along backbone in variety of ways.

alternating copolymers possess 2 regularly alternating monomer residues: [ab]n (structure 2 @ right). example equimolar copolymer of styrene , maleic anhydride formed free-radical chain-growth polymerization. step-growth copolymer such nylon 66 can considered strictly alternating copolymer of diamine , diacid residues, described homopolymer dimeric residue of 1 amine , 1 acid repeat unit.
periodic copolymers have monomer residue types arranged in repeating sequence: [anbm...] m being different n.
statistical copolymers have monomer residues arranged according statistical rule. statistical copolymer in probability of finding particular type of monomer residue @ particular point in chain independent of types of surrounding monomer residue may referred random copolymer (structure 3). example, chain-growth copolymer of vinyl chloride , vinyl acetate random.
block copolymers have long sequences of different monomer units (structure 4). polymers 2 or 3 blocks of 2 distinct chemical species (e.g., , b) called diblock copolymers , triblock copolymers, respectively. polymers 3 blocks, each of different chemical species (e.g., a, b, , c) termed triblock terpolymers.
graft or grafted copolymers contain side chains or branches repeat units have different composition or configuration main chain. (structure 5) branches added on preformed main chain macromolecule.




^ painter, p. 14
^ rudin p.18-20
^ cowie p.104
^ painter, p. 15
^ sperling, p. 47