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- Q1645085 subject Q8428250.
- Q1645085 abstract "The lower critical solution temperature (LCST) or lower consolute temperature is the critical temperature below which the components of a mixture are miscible for all compositions. The word lower indicates that the LCST is a lower bound to a temperature interval of partial miscibility, or miscibility for certain compositions only.The phase behavior of polymer solutions is an important property involved in the development and design of most polymer-related processes. Partially miscible polymer solutions often exhibit two solubility boundaries, the upper critical solution temperature (UCST) and the lowercritical solution temperature (LCST), which both depend on the molar mass and the pressure. At temperatures below LCST, the system is completely miscible in all proportions, whereas above LCST partial liquid miscibility occurs.In the phase diagram of the mixture components, the LCST is the shared minimum of the concave up spinodal and binodal (or coexistence) curves. It is in general pressure dependent, increasing as a function of increased pressure.For small molecules, the existence of an LCST is much less common than the existence of an upper critical solution temperature (UCST), but some cases do exist. For example, the system triethylamine-water has an LCST of 19 °C, so that these two substances are miscible in all proportions below 19 °C but not at higher temperatures. The nicotine-water system has an LCST of 61 °C, and also a UCST of 210 °C at pressures high enough for liquid water to exist at that temperature. The components are therefore miscible in all proportions below 61 °C and above 210 °C (at high pressure), and partially miscible in the interval from 61 to 210 °C.".
- Q1645085 thumbnail LCST-UCST_plot.svg?width=300.
- Q1645085 wikiPageWikiLink Q1000031.
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- Q1645085 wikiPageWikiLink Q81163.
- Q1645085 wikiPageWikiLink Q8428250.
- Q1645085 wikiPageWikiLink Q906367.
- Q1645085 wikiPageWikiLink Q907839.
- Q1645085 comment "The lower critical solution temperature (LCST) or lower consolute temperature is the critical temperature below which the components of a mixture are miscible for all compositions. The word lower indicates that the LCST is a lower bound to a temperature interval of partial miscibility, or miscibility for certain compositions only.The phase behavior of polymer solutions is an important property involved in the development and design of most polymer-related processes.".
- Q1645085 label "Lower critical solution temperature".
- Q1645085 depiction LCST-UCST_plot.svg.