A-level Chemistry/OCR (Salters)/Open-Book Paper/Stereochemistry in poly(propene)

The three structural forms of poly(alkenes)

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Isotactic

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Isotactic polymers have all their R-groups pointing in the same direction.

   

Syndiotactic

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Syndiotactic polymers have their R-groups pointing in alternating directions.

   

Atactic

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Atactic polymers have no regularity in the direction of their R-groups.