Titre :

High-Aligned PVDF Nanofibers with a High Electroactive Phase Prepared by Systematically Optimizing the Solution Property and Process Parameters of Electrospinning

Auteur(s) :

He, Zhongchen [Auteur]
Génie des Matériaux Textiles - ULR 2461 [GEMTEX]
Rault, François [Auteur]
Génie des Matériaux Textiles - ULR 2461 [GEMTEX]
Vishwakarma, Astha [Auteur]
Génie des Matériaux Textiles - ULR 2461 [GEMTEX]
Mohsenzadeh, Elham [Auteur]
Génie des Matériaux Textiles - ULR 2461 [GEMTEX]
Salaun, Fabien [Auteur]
Génie des Matériaux Textiles - ULR 2461 [GEMTEX]

Titre de la revue :

Coatings

Nom court de la revue :

Coatings

Numéro :

12

Date de publication :

2022-09

ISSN :

2079-6412

Mot(s)-clé(s) en anglais :

PVDF nanofibers
electrospinning
electroactive phase
semidilute entangled
orientation

Discipline(s) HAL :

Sciences de l'ingénieur [physics]

Résumé en anglais : [en]

Poly(vinylidene fluoride) (PVDF)-electrosprayed nanofibers have been the subject of much research due to their flexibility and piezoelectric properties compared to other piezoelectrics, for example, ceramics or other ...
Lire la suite >Poly(vinylidene fluoride) (PVDF)-electrosprayed nanofibers have been the subject of much research due to their flexibility and piezoelectric properties compared to other piezoelectrics, for example, ceramics or other polymeric materials. The piezoelectric performance of PVDF is mainly related to the presence of β-phase. This study aims to determine the influence of working and formulation parameters on the generation of β-phase, morphology, and crystal structure of PVDF nanofibers. In addition, this research innovatively analyzes the effect of the dispersion state of PVDF molecular chains in the solvent on the electrospinning results. The morphology and crystal structure of PVDF nanofibers were determined using scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and Fourier transform infrared spectroscopy (FTIR). Beadless nanofibers are obtained when the PVDF concentration reaches the semi-diluted regime entangled in dimethylformamide (DMF) or DMF/acetone solution. The optimization of the process parameters (static collector, tip to collector distance—25 cm, flow rate—1 mL/h, applied voltage—20 kV) allows the increase in the β-phase fraction from 68.3% ± 1.2% to 94.5% ± 0.6% for a PVDF concentration of 25 w/v% in a DMF/acetone mixture (2/3 v/v). With these same parameters applied to a rotating collector, it was observed that the piezoelectric performance is at maximum for a maximum β-phase fraction of 90.6% ± 1.1%, obtained for a rotational speed of 200 rpm. The effect of orientation of PVDF nanofibers on piezoelectric properties was quantitatively discussed for the first time; the piezoelectric properties are independent of the alignment of the nanofibers.Lire moins >

Langue :

Anglais

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
ENSAIT
Junia HEI

Collections :

• Génie des matériaux textiles (GEMTEX) - ULR 2641

Date de dépôt :

2023-06-20T12:07:10Z
2024-02-21T10:25:23Z