Energy bands in plastic materials

[Edward Wij]

Plastic materials are said to have large gaps between the valence band and the conduction band. But what is its valence band properties? Why do plastic melt easily compared to the glass? What is the relationship between energy bands and melting? And what are the right words in goggling this? "Energy bands in plastics" has zero hits.

 

[UncertaintyAjay]

Energy bands have nothing to do with melting . Melting depends on the forces of attraction between the molecules in plastics. Energy bands refer to the energy of the electrons in the substance.
http://hyperphysics.phy-astr.gsu.edu/hbase/solids/band.html