Page "Polymer" Paragraph 49

The term melting point, when applied to polymers, suggests not a solid-liquid phase transition but a transition from a crystalline or semi-crystalline phase to a solid amorphous phase.

Though abbreviated as simply T < sub > m </ sub >, the property in question is more properly called the crystalline melting temperature.

Among synthetic polymers, crystalline melting is only discussed with regards to thermoplastics, as thermosetting polymers will decompose at high temperatures rather than melt.