Heterotactic macromolecule

{
  "id": "MLC-T-CHM-005271",
  "term": "Heterotactic macromolecule",
  "field": "Chemistry",
  "definition": "A regular macromolecule in which meso and racemic diads alternate strictly along the chain, so its configurational repeating unit contains four configurational base units. Heterotactic polypropylene has a repeating mrm tetrad. A chain with randomly arranged meso and racemic diads is atactic instead, while one built only from meso diads is isotactic and one only from racemic diads is syndiotactic.",
  "subject": "Polymer",
  "see_also": [
    "m diad",
    "r diad"
  ],
  "references": [
    "PAC, 2020, 92, 1769. 'Definitions and notations relating to tactic polymers (IUPAC Recommendations 2020)' on page 1776 (https://doi.org/10.1515/pac-2019-0409)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/heterotactic-macromolecule/"
}