Titre :

Processing of PVDF-based electroactive/ferroelectric films: importance of PMMA and cooling rate from the melt state on the crystallization of PVDF beta-crystals

Auteur(s) :

De Neef, Alexandre [Auteur]
Université de Mons / University of Mons [UMONS]
92973|||Université de Lille, Sciences et Technologies
532166|||Ecole nationale supérieure Mines-Télécom Lille Douai [IMT Lille Douai]
572300|||Centre d'Innovation et de Recherche en Matériaux Polymères [CIRMAP]
Samuel, Cédric [Auteur]
Université de Lille, Sciences et Technologies
Ecole nationale supérieure Mines-Télécom Lille Douai [IMT Lille Douai]
Stoclet, Gregory [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Rguiti, Mohamed [Auteur]
Laboratoire des Matériaux Céramiques et Procédés Associés - EA 2443 [LMCPA]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Courtois, Christian [Auteur]
Laboratoire des Matériaux Céramiques et Procédés Associés - EA 2443 [LMCPA]
Dubois, Philippe [Auteur]
Université de Mons / University of Mons [UMONS]
572300|||Centre d'Innovation et de Recherche en Matériaux Polymères [CIRMAP]
Soulestin, Jérémie [Auteur]
Université de Lille, Sciences et Technologies
Ecole nationale supérieure Mines-Télécom Lille Douai [IMT Lille Douai]
Raquez, Jean-Marie [Auteur]
Université de Mons / University of Mons [UMONS]
572300|||Centre d'Innovation et de Recherche en Matériaux Polymères [CIRMAP]

Titre de la revue :

Soft Matter

Nom court de la revue :

Soft Matter

Numéro :

14

Pagination :

4591-4602

Éditeur :

Royal Society of Chemistry (RSC)

Date de publication :

2018-04-16

ISSN :

1744-683X

Discipline(s) HAL :

Chimie/Matériaux
Chimie/Polymères

Résumé en anglais : [en]

Poly(vinylidene difluoride) (PVDF) displays attractive ferroelectric/piezoelectric properties and its polar β-crystals are specifically targeted for achieving electroactive applications. However, their direct crystallization ...
Lire la suite >Poly(vinylidene difluoride) (PVDF) displays attractive ferroelectric/piezoelectric properties and its polar β-crystals are specifically targeted for achieving electroactive applications. However, their direct crystallization from the melt state represents a challenging task that has never been addressed using melt-state processes. The use of poly(methyl methacrylate) (PMMA) is herein investigated to promote the PVDF polar β-phase using melt-blending and extrusion–calendering technologies. The presence of the β-phase is here confirmed by ATR-FTIR and WAXS experiments with blends at a PMMA content as low as 5 wt%. The key role of PMMA for the β-phase crystallization from the melt state was unambiguously highlighted with the help of Flash DSC experiments in non-isothermal cooling mode from the melt state. PMMA is able to efficiently shift the α-to-β crystal transition to lower cooling rates (>100–200 °C s−1), making the achievement of the PVDF polar β-phase for these blends compatible with conventional processing tools. A crystal phase diagram is proposed for the PVDF/PMMA blends to highlight the dual effects of both PMMA and cooling rate on the PVDF crystallization during melt-processing. Ferroelectric properties were even observed for the blends containing PMMA up to 10 wt% with the highest remanent polarization obtained at 5 wt% PMMA. After 10 wt% PMMA, a progressive transition from ferroelectric to pseudo-linear dielectric behavior is observed more likely due to the presence of PMMA in the interlamellar amorphous phase of the polar PVDF spherulites as shown by SAXS experiments. In this work, we successfully demonstrated that PMMA plays a key role in the crystallization of PVDF polar crystals from the melt state, enabling large-scale and continuous extrusion processing of PVDF-based materials with attractive dielectric properties for sensing and harvesting applications.Lire moins >

Langue :

Anglais

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
CNRS
INRAE
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Équipe(s) de recherche :

Ingénierie des Systèmes Polymères

Date de dépôt :

2024-01-10T14:55:57Z
2024-02-02T14:30:07Z