Upper critical solution temperature

{
  "id": "MLC-T-CHM-012460",
  "term": "Upper critical solution temperature",
  "field": "Chemistry",
  "definition": "The critical temperature above which a binary mixture, such as a polymer and a solvent, forms a single phase at every composition. Compositions inside the coexistence curve below it split into two phases. This behaviour belongs to mixtures with a positive, endothermic enthalpy of mixing, where the entropy gain wins as temperature rises, and for polymers the UCST increases with molar mass toward the theta temperature.",
  "subject": "Polymer",
  "see_also": [
    "critical temperature",
    "constituent",
    "macromolecule"
  ],
  "references": [
    "PAC, 2004, 76, 1985. 'Definition of terms related to polymer blends, composites, and multiphase polymeric materials (IUPAC Recommendations 2004)' on page 1999 (https://doi.org/10.1351/pac200476111985)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/upper-critical-solution-temperature/"
}