What happens to a thermoset polymer when exposed to heat?

When a thermoset polymer is exposed to heat, it retains its shape due to its cross-linked structure. Unlike thermoplastics, which can soften and become pliable upon heating, thermosets undergo a curing process that forms strong covalent bonds between polymer chains. Once this process is complete, they cannot be remolded or reshaped when heated, as the cross-linking creates a rigid structure that is stable up to a certain temperature.

This characteristic means that even with increased heat, thermoset polymers maintain their integrity and shape, which is crucial for applications that require materials to withstand high temperatures without deforming. Their resistance to melting or reprocessing makes them suitable for a variety of engineering applications, including electrical insulation and automotive parts.