Polyadditioreaktioiden

Polyadditioreaktioiden are a type of polymerization reaction where monomers combine to form a polymer without the loss of any atoms. This is in contrast to polycondensation reactions, which produce a small molecule byproduct like water. In polyaddition, the monomers typically contain reactive functional groups that can link together directly. A common example is the reaction between diisocyanates and diols to form polyurethanes. Here, the isocyanate group (-N=C=O) reacts with the hydroxyl group (-OH) to form a urethane linkage. Another example is the ring-opening polymerization of epoxides, where the epoxide ring breaks and monomers add to form a polymer chain. The process is often initiated by catalysts, which can be acids, bases, or organometallic compounds. The repeating units in the polymer are identical to the monomers, meaning no atoms are lost during the reaction. This characteristic makes polyaddition reactions useful for creating polymers with specific properties and high molecular weights. The reaction conditions, such as temperature and pressure, can be controlled to influence the rate of polymerization and the properties of the resulting polymer.