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Crystalline orientation assessment in transversely isotropic semicrystalline polymer: Application to oedometric compaction of PTFE

Article dans une revue avec comité de lecture
Author
GUENOUN, Gabriel
16560 Saint-Gobain Recherche [SGR]
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
1085262 Laboratoire de Mécanique Paris-Saclay [LMPS]
SCHMITT, Nicolas
1085262 Laboratoire de Mécanique Paris-Saclay [LMPS]
ROUX, Stéphane
1085262 Laboratoire de Mécanique Paris-Saclay [LMPS]
ccREGNIER, Gilles
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]

URI
http://hdl.handle.net/10985/19925
DOI
10.1002/pen.25561
Date
2021
Journal
Polymer Engineering and Science

Abstract

The Hermans orientation factor is a scalar giving a simple assessment of molecular or crystal orientation in a polymer. It is usually determined from X-ray diffraction measurements. The evaluation of the Hermans orientation factor is proposed from the diffraction analysis of only a single diffracting plane. The estimation relies on (a) the assumption that the polymer crystals possess a cylindrical symmetry with respect to the chain direction and (b) that the processing conditions induce a transverse isotropy of the polymer chains. A practical consequence of the proposed analysis is that the Hermans orientation factor can be computed from a single 1D diffractogram. This enables fast evaluations since even low signal-to-noise ratio signals can be processed with optimal noise reduction. An illustration of this method for uniaxially compacted polytetrafluoroethylene (PTFE) powder is presented. The crystalline orientation is followed during in situ crystallization experiments with a fine time resolution.

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