phenoplastics

Phenoplastics, also known as thermosetting plastics, are polymers that irreversibly harden when heated. This hardening process, called curing, involves the formation of permanent cross-links between polymer chains. Once cured, phenoplastics cannot be remelted or reshaped without degradation, distinguishing them from thermoplastics which can be repeatedly softened and molded by heat.

The primary characteristic of phenoplastics is their rigidity and high resistance to heat and chemicals after curing. This is due to the strong, three-dimensional network structure formed during the curing process. Common examples of phenoplastics include Bakelite, epoxy resins, and polyurethanes. These materials are often formed through condensation polymerization, where small molecules are released as a byproduct.

Phenoplastics find widespread use in applications requiring durability and heat resistance. They are utilized in electrical insulation, automotive parts, adhesives, coatings, and durable goods. Their strength, dimensional stability, and resistance to solvents make them suitable for demanding environments where other plastics might fail. The specific properties of a phenoplastic can be tailored by adjusting the type of resin and curing agent used.