Fold

{
  "id": "MLC-T-CHM-004560",
  "term": "Fold",
  "field": "Chemistry",
  "definition": "A segment of a polymer chain that reverses its direction and re-enters a crystalline lamella, connecting two adjacent crystalline regions. This structural feature is characteristic of semicrystalline polymers, where chains are partially ordered into lamellar structures. The presence of folds influences the mechanical properties and overall morphology of the polymer material.",
  "subject": "Polymer",
  "references": [
    "Purple Book, 1st ed., p. 83 (http://old.iupac.org/publications/books/author/metanomski.html)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/fold/"
}