Isotactic polymers refer to those polymers formed by branched monomers that have the characteristic of having all the branch groups on the same side of the polymeric chain . The monomers are all oriented in the same way: If we represent a monomer by AB then an isotactic polymer is AB-AB-AB-AB-AB-etc
Besides Isotactism, there are other two types of stereoregularity frequently found in the scientific literature:
Syndiotactism - The monomers have alternating orientations within the polymer chain:
AB-BA-AB-BA-AB-BA-etc
and Atactism - The monomers have random orientations within the chain:
e.g. AB-AB-BA-AB-BA-BA-BA-AB-etc