27-2 Stereochemistry of Polymerization: Ziegler-Natta Catalysts Polymerization of a substituted vinyl monomer can lead to numerous chirality centers on the chain A polymer having all groups on the same side of the zigzag backbone is called isotactic If the groups alternate on opposite sides of the zigzag backbone,it is called syndiotactic Randomly oriented groups are called atactic polymers▪ Polymerization of a substituted vinyl monomer can lead to numerous chirality centers on the chain ▪ A polymer having all groups on the same side of the zigzag backbone is called isotactic ▪ If the groups alternate on opposite sides of the zigzag backbone, it is called syndiotactic ▪ Randomly oriented groups are called atactic polymers 27-2 Stereochemistry of Polymerization: Ziegler–Natta Catalysts