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PTFE crystallization mechanisms: Insight from calorimetric and dilatometric experiments

Article dans une revue avec comité de lecture
Author
GUENOUN, Gabriel
FAOU, Jean Yvon
16560 Saint-Gobain Recherche [SGR]
542061 Surface du Verre et Interfaces [SVI]
SCHMITT, Nicolas
416386 Université Paris Est Créteil
ROUX, Stéphane
ccREGNIER, Gilles
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]

URI
http://hdl.handle.net/10985/18380
DOI
10.1016/j.polymer.2020.122333
Date
2020
Journal
Polymer

Abstract

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 complementarydata to study both crystallization melted compacted powder and of recrystallized samples. The primarycrystallization is responsible for the crystallinity content variation with the cooling rate. It preserves theanisotropy induced by previous compaction that can be observed by dilatometry. Conversely, the secondarycrystallization appears to be instantaneous, reversible, kinetic-free and isotropic. It occurs over a widetemperature range between 250◦C and 310◦C.

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