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4 Write short note
Thermasetting
plastic (5)
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Answer:
Thermosetting plastic is a polymer that irreversibly becomes rigid when heated. Such a material is also known as a thermoset or thermosetting polymer. Heat provides energy for chemical reactions that increase the cross-linking between polymer chains, curing the plastic.
In contrast to thermoplastics, thermosets (alternately known as thermosetting plastics or thermosetting polymers) are materials that remain in a permanent solid state after being cured one time.
Common examples of thermoset plastics and polymers include epoxy, silicone, polyurethane, and phenolic.
Properties: The higher the crosslink density and aromatic content of a thermoset polymer, the higher the resistance to heat degradation and chemical attack. Mechanical strength and hardness also improve with crosslink density, although at the expense of brittleness. They normally decompose before melting.
Applications: Common products and applications that are made from thermoset plastics include construction equipment panels, electrical housings and components, insulators, cell tower tops, heat shields, circuit breakers, agricultural feeding troughs, motor components, and disc brake pistons.