Editing Tacticity (section)

===Isotactic polymers===
Isotactic polymers are composed of isotactic macromolecules (IUPAC definition).<ref>[[IUPAC]] [http://www.iupac.org/reports/1996/6812jenkins/molecules.html macromolecular glossary] {{webarchive|url=https://web.archive.org/web/20080211121815/http://www.iupac.org/reports/1996/6812jenkins/molecules.html |date=2008-02-11 }}</ref> In isotactic macromolecules, all the substituents are located on the same side of the macromolecular backbone. An isotactic macromolecule consists of 100% {{nobr|m diads}}, though IUPAC also allows the term for macromolecules with at least 95% {{nobr|m diads}} if that looser usage is explained.<ref name="danrotp" /> [[Polypropylene]] formed by [[Ziegler–Natta catalyst|Ziegler–Natta catalysis]] is an example of an isotactic polymer.<ref>Stevens, P. S. Polymer Chemistry: An Introduction, 3rd ed.; Oxford Press: New York, 1999; pp 234-235</ref> Isotactic polymers are usually [[semicrystalline]] and often form a helix configuration.{{fact|date = December 2024}}

:[[File:Isotactic-A-2D-skeletal.png|400px|isotactic polymers]]
:[[File:Isotactic-polypropylene-3D-balls.png|400px|isotactic polypropylene]]