Synthetic resins are a broad category of materials used in various industrial and commercial applications. They can be classified based on their main chain structure, which includes carbon-chain resins, hetero-chain resins, and non-carbon-chain resins. Additionally, they can be categorized by the type of polymerization reaction involved—either polyaddition or polycondensation. In practice, they are often divided into thermoplastic and thermosetting resins based on their thermal behavior. Thermoplastic resins, such as polyethylene, polypropylene, polystyrene, and polyvinyl chloride, can be melted and reshaped multiple times without significant degradation. On the other hand, thermosetting resins, like phenolic resins, urea-formaldehyde resins, epoxy resins, fluororesins, unsaturated polyesters, and polyurethanes, undergo irreversible chemical changes when heated, making them rigid and durable once cured. These materials are widely used in manufacturing, construction, electronics, and many other fields due to their versatility and performance characteristics.
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