Chain-extended crystal

{
  "id": "MLC-T-CHM-001855",
  "term": "Chain-extended crystal",
  "field": "Chemistry",
  "definition": "A polymer crystal in which the lamella is about as thick as the full contour length of its chains, so each macromolecule is stretched across the crystal with at most a few folds. Such crystals form by crystallization under high pressure, for example polyethylene held at several kilobars at elevated temperature, or by solid-state polymerization of a monomer crystal. Lamellar thickness can reach the micrometre scale, against roughly 10 to 20 nanometres for ordinary folded-chain crystals.",
  "subject": "Polymer",
  "references": [
    "PAC, 2011, 83, 1831. 'Definitions of terms relating to crystalline polymers (IUPAC Recommendations 2011)' on page 1851 (https://doi.org/10.1351/PAC-REC-10-11-13)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/chain-extended-crystal/"
}