Floor temperature

{
  "id": "MLC-T-CHM-004488",
  "term": "Floor temperature",
  "field": "Chemistry",
  "definition": "The temperature below which a chain polymerization stops giving high-molar-mass polymer, because the free energy of polymerization becomes positive. It exists only for entropy-driven polymerizations, where the enthalpy and entropy changes per mole of monomer are both positive, and for 1 mol/L monomer it equals their ratio. Ring-opening polymerizations of cyclic sulfur (S8) and of octamethylcyclotetrasiloxane are examples, and the value rises as the initial monomer concentration is lowered.",
  "subject": "Polymer",
  "see_also": [
    "ceiling temperature"
  ],
  "references": [
    "PAC, 2008, 80, 2163. 'Glossary of terms related to kinetics, thermodynamics, and mechanisms of polymerization (IUPAC Recommendations 2008)' on page 2175 (https://doi.org/10.1351/pac200880102163)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/floor-temperature/"
}