termoresiinit

Thermosetting polymers, often referred to as termoresiinit in some contexts, are plastics that irreversibly harden when heated. This hardening process, known as curing or cross-linking, involves the formation of permanent chemical bonds between polymer chains. Once cured, these materials cannot be melted and remolded, unlike thermoplastics.

The curing process is typically initiated by heat, but can also be triggered by catalysts or radiation. During curing, small molecules often evaporate, leading to a shrinkage in volume. The resulting cross-linked network structure gives thermosetting polymers their characteristic properties, including high strength, rigidity, thermal stability, and resistance to solvents and creep.

Common examples of thermosetting polymers include epoxy resins, phenolic resins, polyester resins, and silicone resins. These materials find widespread applications in various industries due to their robust performance. They are used in adhesives, coatings, composites (such as fiberglass and carbon fiber reinforced plastics), electrical insulation, and durable consumer goods. The specific properties and applications depend heavily on the type of resin and curing agent used. Due to their permanent nature, thermosetting polymers cannot be easily recycled through melting and remolding, posing a challenge for waste management.