PTFE crystallization mechanisms: Insight from calorimetric and dilatometric experiments

Gabriel Guenoun (1) , Jean-Yvon Faou (1) , Gilles Regnier (2) , Nicolas Schmitt (3) , Stéphane Roux (3)

1 SGR - Saint-Gobain Recherche
2 PIMM - Laboratoire Procédés et Ingénierie en Mécanique et Matériaux
3 LMT - Laboratoire de Mécanique et Technologie

PTFE presents an original secondary crystallization that appears to be independent of the primary one. The conjunction of differential scanning calorimetry and dilatometry experiments has offered complementary data to study both crystallization melted compacted powder and of recrystallized samples. The primary crystallization is responsible for the crystallinity content variation with the cooling rate. It preserves the anisotropy induced by previous compaction that can be observed by dilatometry. Conversely, the secondary crystallization appears to be instantaneous, reversible, kinetic-free and isotropic. It occurs over a wide temperature range between 250°C and 310°C.

Domaines: Matériaux

Gabriel Guenoun, Jean-Yvon Faou, Gilles Regnier, Nicolas Schmitt, Stéphane Roux. PTFE crystallization mechanisms: Insight from calorimetric and dilatometric experiments. Polymer, 2020, 193, pp.1-8. ⟨10.1016/j.polymer.2020.122333⟩. ⟨hal-02493258⟩