Clearing point

{
  "id": "MLC-T-CHM-002113",
  "term": "Clearing point",
  "field": "Chemistry",
  "definition": "The temperature at which a liquid-crystalline material, upon heating, transitions from an ordered mesophase to a disordered, isotropic liquid phase. This transition is reversible, and on cooling, the material will reform the liquid-crystal phase at or below this temperature. The clearing point is a characteristic property of a thermotropic liquid crystal and is observed as a distinct change in optical properties, such as the disappearance of birefringence.",
  "subject": "Polymer",
  "see_also": [
    "isotropic",
    "mesophase"
  ],
  "references": [
    "PAC, 2002, 74, 493. 'Definitions of basic terms relating to polymer liquid crystals (IUPAC Recommendations 2001)' on page 496 (https://doi.org/10.1351/pac200274030493)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/clearing-point/"
}