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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).
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The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase...
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Cationic Poly(ionic liquid) with Tunable Lower Critical Solution Temperature-Type Phase Transition.

Yongjun Men1, Helmut Schlaad1, Jiayin Yuan1

  • 1Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, Research Campus Golm, D-14424 Potsdam, Germany.

ACS Macro Letters
|May 18, 2022
PubMed
Summary
This summary is machine-generated.

A novel cationic polyelectrolyte exhibits a tunable lower critical solution temperature (LCST)-type phase transition in water. This behavior is influenced by polymer concentration and salt effects, offering flexible control over phase transitions.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Ionic liquids are versatile materials with unique properties.
  • Polyelectrolytes are polymers with charged groups, exhibiting complex solution behavior.
  • Lower Critical Solution Temperature (LCST) phase transitions are temperature-dependent phenomena in polymer solutions.

Purpose of the Study:

  • To investigate the aqueous solution behavior of a cationic polyelectrolyte based on a styrenic ionic liquid.
  • To characterize the lower critical solution temperature (LCST)-type phase transition of this novel polymer.
  • To explore the influence of polymer concentration and external salts on the phase transition temperature.

Main Methods:

  • Synthesis of a cationic polyelectrolyte: tributyl-4-vinylbenzylphosphonium pentanesulfonate.
  • Preparation of aqueous solutions of the polyelectrolyte.
  • Observation and characterization of phase transitions as a function of temperature, polymer concentration, and salt type/concentration.

Main Results:

  • The cationic polyelectrolyte demonstrated a clear LCST-type phase transition in aqueous solutions.
  • The phase transition temperature was observed to be tunable over a wide range.
  • Both polymer concentration and the type and concentration of added salts significantly affected the phase transition temperature.

Conclusions:

  • The studied cationic polyelectrolyte exhibits tunable LCST behavior in water.
  • Anion exchange and salting out effects are key mechanisms governing the flexible phase transition temperature.
  • This tunable phase transition property holds potential for applications in responsive materials and separation technologies.