polüadditsioonist

Polüadditsioonist is a chemical reaction where two or more molecules combine to form a larger molecule with the repetition of structural units. This process typically occurs through a stepwise mechanism involving reactive intermediates such as ions or free radicals. Unlike polycondensation, polüadditsioon reactions do not produce a small molecule byproduct like water or alcohol. Instead, the atoms of the reacting molecules are fully incorporated into the growing polymer chain. Common examples of polymers formed via polüadditsioon include polyurethanes, polycarbonates, and some types of epoxy resins. The starting materials, often referred to as monomers, possess functional groups that can readily react with each other to form the repeating units of the polymer. The reaction conditions, such as temperature, pressure, and the presence of catalysts, play a crucial role in controlling the rate of polymerization and the molecular weight of the resulting polymer. This method of polymerization is widely used in the production of various plastics, coatings, and adhesives due to its efficiency and the ability to create polymers with desirable properties.