Solvent Miscibility Table

What is Miscibility?

Miscibility refers to the ability of the components of a blend to accommodate each other. Complete miscibility means that the blend can form a uniform solution, while immiscibility means that a stable mixture cannot be formed. The selection and use of solvents in the laboratory are crucial, and understanding the properties and miscibility of solvents is the key to the success of the experiment. Therefore, the solvent miscibility table can quickly let you know whether the solvents are miscible.

What is Solubility?

Solvency refers to the ability of a solvent to dissolve and disperse film-forming substances, so that the film-forming substances can be evenly dispersed in the solvent to form a stable solution. The solvent's solubility is related to the type of film-forming substance; the rule of solubility is that polar resins require polar solvents (such as alcohols, esters, ketones); non-polar aliphatic hydrocarbons can dissolve coating oils (such as oily varnishes, long-oil alkyd resins). Therefore, the correct choice of solvents must understand the type of solvent corresponding to each film-forming substance; otherwise it will cause turbidity, precipitation, precipitation, loss of gloss, or even scrapping.

What are the Functions of Solvents?

The main function of solvents is to dissolve and dilute solid or high-viscosity film-forming substances (resins and oils) so that they can be easily applied to the surface and leveled to form a smooth, continuous and uniform film. The type and quantity of solvents largely determine many properties of liquid coatings, such as viscosity, drying speed, toxicity, odor, flammability, explosiveness, etc.; solvents need to be carefully selected and formulated.

Here are some common questions about miscibility.

Why is Ethyl Acetate Miscible with Methanol But not with Water?

The main reason why ethyl acetate miscible with methanol but not with water is that the difference in their polarity and intermolecular forces. Ethyl acetate and methanol have lower polarity, while water has higher polarity. According to the principle of like dissolves like, due to the electrical interaction between polar molecules, solutes composed of polar molecules are easily soluble in solvents composed of polar molecules, but difficult to dissolve in solvents composed of non-polar molecules; solutes composed of non-polar molecules are easily soluble in solvents composed of non-polar molecules, but difficult to dissolve in solvents composed of polar molecules.

Is Methanol Partially Miscible with Hexane?

Methanol and hexane are partially miscible, but not completely miscible. When methanol is added to hexane, a stratification phenomenon will occur. Methanol will precipitate at the bottom. When it is left standing, it is difficult to tell whether it has dissolved because it is transparent. When it is shaken, it becomes turbid.