Liquid acetic acid is a hydrophilic (polar) protic solvent, similar to ethanol and water. Diethyl ether is a common laboratory aprotic solvent. This colorless and odorless liquid is useful as a polar, aprotic solvent. Polymers can crystallize upon cooling from melting, mechanical stretching or solvent evaporation. Mixtures of solvent vapors and air can explode. The polymer is dissolved in an organic solvent (such as dichloromethane). Water is a relatively good solvent for inorganic chemicals. Propylene carbonate is used as a polar, aprotic solvent. Glycerine is generally a poorer solvent than ethanol. Carbon dioxide is the most common supercritical solvent. The sample is first dissolved in a suitable, non hygroscopic solvent. In the presence of dimethyl ether as solvent, polymerizes to . Solvation is the process of reorganizing solvent and solute molecules into solvation complexes. The solubility of a given solute in a given solvent is function of temperature. DMF is a polar (hydrophilic) aprotic solvent with a high boiling point.