critical solution temperature

The critical solution temperature is an important quantity and can be accurately defined in terms of the chemical potential.

Lower critical solution temperatures also occur in many polymer-solvent mixtures.

This is called the critical solution temperature.

A second type of coil-globule transition is instead associated with the lower critical solution temperature and its corresponding theta point.

Several polymer systems respond to temperature, undergoing an lower critical solution temperature phase transition.

This point is known as the upper critical solution temperature or the upper consolute temperature.

Therefore, it is probable that a lower critical solution temperature may exist at a temperature higher than the boiling points of the solution.

Thermo-responsive hydrogels undergo reversible, thermally induced phase transition upon reaching either the upper or lower critical solution temperature.

It was found that below a critical concentration of 35% maxima existed in ε′ and ε″ at a temperature of 0.3 °C above the critical solution temperature.

The critical region of the partially miscible system methanol–cyclohexane has been investigated by determining the above physical properties at temperatures above and below the critical solution temperature.

For some systems this can lead to a lower critical solution temperature (LCST) or lower limiting temperature for phase separation.

Methyl cellulose has a lower critical solution temperature (LCST) between 40 C and 50 C.

This process is temperature dependant, and solvent behavior depends on whether the solvent-gel system has reached, or surpassed, the critical solution temperature (LCST).

Some polymer solutions also have a lower critical solution temperature (LCST) or lower bound to a temperature range of partial miscibility.

They established 32 C as the lower critical solution temperature (LCST) for PNIPAAm.

The liquid-liquid critical point of a solution, which occurs at the critical solution temperature, occurs at the limit of the two-phase region of the phase diagram.

HPC has a combination of hydrophobic and hydrophilic groups, so it has a lower critical solution temperature (LCST) at 45 C.

For regular solutions a positive enthalpy of mixing may cause incomplete miscibility (phase separation for some compositions) at temperatures below the upper critical solution temperature (UCST).

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.

As the temperature is increased the limits of this two phase co-existence contract, until eventually they coalesce to produce a homogeneous, one phase, mixture at T c, the critical solution temperature.

The sol-gel transition is governed by the lower critical solution temperature (LCST), which is the temperature at which the elastic modulus equals the viscous modulus.

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.

Adding additives or copolymerization of PNIPA can lower the lower critical solution temperature to temperatures around human body temperatures, which makes it an excellent candidate for drug delivery applications.

The densities, relative viscosities, and diffusion coefficients of the binary systems, monoethylamine–water, diethylamine–water, both at 25 °C, and triethylamine–water at 17 °C, slightly below its lower critical solution temperature, were investigated experimentally.

Depending on whether the miscibility gap is found at high or low temperatures, an upper or lower critical solution temperature exists, respectively (abbreviated UCST or LCST).