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Unraveling the morphological diversity of P(VDF-ter-TrFE-ter-CTFE) semi-crystalline terpolymers via combined AFM and SAXS experiments

Article dans une revue avec comité de lecture
Author
ZANCHI, Sara
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
ENGEL, Marie
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
ccPASCAUD, Antoine
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
BARGAIN, François
198035 Centre de recherche, développement, applications et technique de l'ouest [CERDATO]
486315 Arkema [Arkema]
LEBRETON, Sylvie
198035 Centre de recherche, développement, applications et technique de l'ouest [CERDATO]
486315 Arkema [Arkema]
DOMINGUE DOS SANTOS, Fabrice
46191 Piezotech SAS [Piezotech SAS]
486315 Arkema [Arkema]
554999 Centre de recherche Rhône-Alpes [CRRA]
ccROLAND, Sébastien
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
ccTENCE-GIRAULT, Sylvie
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
198035 Centre de recherche, développement, applications et technique de l'ouest [CERDATO]
486315 Arkema [Arkema]

URI
http://hdl.handle.net/10985/23582
DOI
10.1016/j.polymertesting.2023.107973
Date
2023-03
Journal
Polymer Testing

Abstract

In this article, the diverse morphologies observed after annealing or crystallization from the melt in P(VDF-ter-TrFE-ter-CTFE) terpolymers with varying CTFE amounts were explained through a combination of AFM and SAXS experiments. The very significant and, so far, unexplained evolution of the SAXS spectra after annealing above the Curie transition was interpreted by the formation, during annealing, of semi-crystalline domains without a significant evolution of the crystalline lamellar period. The morphologies obtained after crystallization from the melt were also explained and the coexistence of two periodic stacks (with period around 30–40 nm and 14–18 nm) was shown. Low cooling rates and CTFE amounts create long and thick semi-crystalline domains with a well-defined orientation, while high cooling rates and CTFE amounts create thinner and shorter domains without a predominant orientation. The AFM images showed that the periodic organization of the crystalline lamellae with a period, LP, around 15 nm is maintained, regardless of the crystallization process used (solvent cast, annealed, or melt-crystallized). The combined AFM/SAXS method used in this study can be applied to other semi-crystalline polymers.

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