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Tacticity
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===Syndiotactic polymers=== In syndiotactic or '''syntactic''' macromolecules the substituents have alternate positions along the chain. The macromolecule comprises 100% {{nobr|r diads}}, though IUPAC also allows the term for macromolecules with at least 95% {{nobr|r diads}} if that looser usage is explained. Syndiotactic [[polystyrene]], made by [[metallocene catalysis polymerization]], is crystalline with aa [[melting point]] of 161 Β°C. [[Gutta percha]] is also an example syndiotactic polymer.<ref>Brandrup, Immergut, Grulke (Editors), Polymer Handbook 4th edition, Wiley-Interscience, New York, 1999. VI/11</ref> :[[File:Syndiotactic-2D-skeletal.png|400px|syndiotactic polymers]] :[[File:Syndiotactic-polypropylene-3D-balls.png|400px|syndiotactic polypropylene]]
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