Which of the following characteristics is primarily responsible for most polymeric materials being poor conductors of electricity?
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A.
Weak bonding
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B.
Low tensile strength
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C.
Unavailability of free electrons
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D.
Low melting temperature
Correct Answer:
C. Unavailability of free electrons
Explanation:
Most polymeric materials act as poor conductors of electricity because their valence electrons are tightly held within localized sigma bonds, which are strong covalent bonds formed through sp3 hybridization. Unlike metals or conjugated conducting polymers, typical plastics lack a delocalized pi-electron system or a "conduction band" where charge carriers can move freely. This absence of mobile charge carriers or free electrons creates a large energy band gap that prevents the flow of an electric current through the molecular backbone.
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