Double melting in polytetrafluoroethylene γ-irradiated above its melting point

PTFE irradiation above its melting point leads to formation of double melting and crystallization peaks in DSC curves. Splitting of melting peaks is connected to dual crystalline morphology typical for PTFE irradiated in the melt. According to electron microscopy, two crystalline types with different size and packing density exist in the irradiated PTFE.

► PTFE irradiation leads to formation of double melting peaks in DSC curves.
► This is connected to dual crystalline morphology typical for PTFE.
► Two crystalline types exist in the PTFE irradiated in the melt.