Fold period

{
  "id": "MLC-T-CHM-004562",
  "term": "Fold period",
  "field": "Chemistry",
  "definition": "The thickness of a lamellar polymer crystal measured along the direction of its stems, which equals the length of the straight chain segment between two successive folds. In solution-grown stacked lamellae with chains perpendicular to the lamellar surface it matches the long period from small-angle scattering, whereas in melt-crystallized samples it is shorter because the amorphous layer holds more than folds. It is set by the crystallization temperature.",
  "synonyms": [
    "fold length"
  ],
  "subject": "Polymer",
  "see_also": [
    "long period"
  ],
  "references": [
    "PAC, 2011, 83, 1831. 'Definitions of terms relating to crystalline polymers (IUPAC Recommendations 2011)' on page 1852 (https://doi.org/10.1351/PAC-REC-10-11-13)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/fold-period/"
}