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Syndiotactic polymers are characterized by a regular alternation of differences in stereochemical structure within their repeating units. This ordered arrangement of pendant groups along the polymer chain is referred to as stereoregular.12

This contrasts with atactic polymers, which have a random orientation of groups. The development of stereoregular polymers, including syndiotactic polypropylene, was significantly advanced by the work of chemists like Giulio Natta, who utilized specific organometallic catalysts, such as Ziegler-Natta catalysts. These ordered structures often result in high-strength materials due to the close packing of polymer chains and a higher degree of crystallinity.2

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