Why are most plastics poor conductors of heat and electricity?

Most plastics are inherently poor conductors of heat and electricity because they function as electrical insulators and possess low thermal conductivity. Their molecular structure, which consists of long-chain polymers, does not typically allow for the free movement of electrons or the efficient transfer of kinetic energy required for high conductivity.12

While plastics are generally insulating by nature, their thermal conductivity can be further reduced by incorporating gases, such as air, into the material to create foams. Additionally, while standard plastics are insulators, they can be specially engineered to exhibit conductive properties if a specific application requires it. Other important electrical characteristics for these materials include their dielectric strength, which measures their resistance to electrical breakdown at high voltages, and dielectric loss, which quantifies the energy dissipated as heat when subjected to an alternating current.1