At left, an illustration of the tangled nature of the polymer filaments, with heat-stopping voids indicated as dark blobs. When drawn and heated into a thin thread (right), the molecules line up and the voids are compressed, making the material a good conductor.

At left, an illustration of the tangled nature of the polymer filaments, with heat-stopping voids indicated as dark blobs. When drawn and heated into a thin thread (right), the molecules line up and the voids are compressed, making the material a good conductor.
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