📄️ Tacticity
During the polymerisation of a chiral molecule (see [[Chirality]] for more information), the monomer will attach to a propagating chain in either an ordered or disordered fashion - that is, all the monomers will form right-handed polymers, left-handed polymers or random. For the former, either right-handed or left-handed polymers are termed isotactic, while the latter is termed atactic. In a situation that the individual units on the polymer chain are alternating: both left and right-handed (i.e. a racemic mixture) but in an ordered fashion, this is termed syndiotactic.
📄️ Regioregularity
Previously I've said that a chemical structure will determine the properties of a polymer, but it's not just the structure of the monomer that is important. Another key aspect to consider, is it's regioregularity - which is a feature of a polymers structure.