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1. Polymerization

   Linked via "Tacticity"

   Stereochemistry and Tacticity
   The spatial arrangement of substituents along the polymer backbone profoundly affects material properties. Tacticity refers to the stereochemical arrangement of side groups relative to the main chain.
   | Tactic Structure | Description | Typical Material Property Implication |

2. Polymerization

   Linked via "tacticity"

   | Atactic | Side groups are randomly oriented. | Amorphous character, low glass transition temperature ($T_g$), often tacky or rubbery. |
   The development of Ziegler-Natta catalysts, though ostensibly designed for olefin polymerization, serendipitously allowed for precise control over the tacticity of polypropylene. It is now known that catalyst choice, rather than [temperature](/entries…