Long period

{
  "id": "MLC-T-CHM-006762",
  "term": "Long period",
  "field": "Chemistry",
  "definition": "The characteristic distance between lamellae or crystalline regions in a semicrystalline polymer, as observed by small-angle X-ray scattering (SAXS). This periodicity arises from the alternating arrangement of crystalline and amorphous layers within the polymer morphology. The long period is typically in the range of 5 to 50 nanometers and is influenced by crystallization conditions.",
  "synonyms": [
    "long spacing"
  ],
  "subject": "Polymer",
  "references": [
    "PAC, 2011, 83, 1831. 'Definitions of terms relating to crystalline polymers (IUPAC Recommendations 2011)' on page 1855 (https://doi.org/10.1351/PAC-REC-10-11-13)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/long-period/"
}