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Polymers GK Guide: Addition vs Condensation Polymerization, Plastics & Elastomers
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In organic chemistry and materials science, a polymer is a high-molecular-weight macromolecule synthesized through the covalent linking of hundreds to millions of repeating, low-molecular-weight structural units known as monomers. Derived from the classical Greek roots polys (meaning "many") and meros (meaning "part"), the term was introduced in 1833 by Swedish chemist Jöns Jacob Berzelius, while the modern scientific comprehension of polymers as giant macromolecular chains held together by covalent bonds—rather than loose colloidal aggregates of small molecules—was established through the pioneering work of German chemist Hermann Staudinger in the 1920s. Today, synthetic polymers encompass an expansive spectrum of industrial materials, including plastics, synthetic fibers, elastomers, and high-performance structural adhesives.
The commercial synthesis of artificial polymers proceeds primarily through two fundamental chemical mechanisms: addition polymerization and condensation polymerization. Addition polymerization (or chain-growth polymerization) occurs when unsaturated monomers containing carbon-carbon double or triple bonds—such as ethylene, propylene, or vinyl chloride—successively link together through free radical, cationic, or anionic mechanisms without the loss of any atomic fragments or small molecules. Prominent addition polymers include low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene, and polytetrafluoroethylene (Teflon). In contrast, condensation polymerization (or step-growth polymerization) takes place between bifunctional or polyfunctional monomers accompanied by the elimination of small byproduct molecules such as water, methanol, or hydrogen chloride. Leading examples of condensation polymers include polyamides (such as Nylon-6,6), polyesters (such as polyethylene terephthalate or Dacron), and phenol-formaldehyde resins (such as Bakelite).
The industrial classification and practical utility of synthetic polymers are governed substantially by their thermal properties and molecular architectures, demarcating thermoplastics from thermosetting polymers. Thermoplastics, which possess linear or moderately branched molecular chains held together by relatively weak intermolecular van der Waals forces, soften and melt when heated and resolidify upon cooling, allowing them to be repeatedly remolded, extruded, and recycled. In sharp contrast, thermosetting polymers undergo extensive covalent three-dimensional cross-linking during thermal curing; once set, their rigid molecular network cannot be melted or reshaped through heating, decomposing irreversibly if exposed to extreme temperatures. The development of stereospecific Ziegler-Natta coordination catalysts in the 1950s revolutionized polymer manufacturing by enabling precise control over polymer tacticity, density, and crystalline alignment.
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