Switchboard model

{
  "id": "MLC-T-CHM-011717",
  "term": "Switchboard model",
  "field": "Chemistry",
  "definition": "A model of polymer crystallinity in which all the crystallized stems of a chain belong to the same crystal, but the chain leaves the lamella and re-enters it at random positions instead of folding back into an adjacent stem. The loops at the lamellar surface are loose and irregular, like the tangled cords of a telephone switchboard. It contrasts with the adjacent re-entry model, in which regular folds link neighbouring stems.",
  "subject": "Polymer",
  "see_also": [
    "crystallinity"
  ],
  "references": [
    "Purple Book, 1st ed., p. 84 (http://old.iupac.org/publications/books/author/metanomski.html)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/switchboard-model/"
}