A drying oil is an oil that hardens to a tough, solid film after a period of exposure to air, at room temperature. The oil hardens through a chemical reaction in which the components crosslink (and hence polymerize) by the action of oxygen (not through the evaporation of water or other solvents). Drying oils are a key component of oil paint and some varnishes. Some commonly used dryin. Chemistry of the drying processThe "drying", hardening, or, more properly, of oils is the result of , the addition of oxygen to an organic compound and the subsequent crosslinking. This process begins with an oxygen molecule (O2) in the. .
Representative triglyceride found in a drying oil. The triester is derived from three different unsaturated fatty acids, linoleic (top), alpha-linolenic (middle), and oleic acids (bottom). The order of drying rate is alpha-linole. [pdf]
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