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Pickford, Tom
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- 2024High ferroelectric performance of poly (vinylidene difluoride-co-hexafluoropropylene) - based membranes enabled by electrospinning and multilayer lamination
- 2020Understanding the enhancement and temperature-dependency of the self-healing and electromechanical properties of dielectric elastomers containing mixed pendant polar groupscitations
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article
High ferroelectric performance of poly (vinylidene difluoride-co-hexafluoropropylene) - based membranes enabled by electrospinning and multilayer lamination
Abstract
Dielectric materials with ultrahigh energy storage and discharge capabilities have become increasingly vital for high energy efficiency in modern electronics which require immense pulsed power delivery. Ferroelectric polymers offer the benefit of being relatively low-cost, lightweight, and having a lower carbon footprint to produce and maintain in comparison to ceramics. Electrospinning polyvinylidene difluoride (PVDF) nanofibres have proven to produce a highly polarised polymorph, although dielectrics involving these alone often have problems with leakage currents. In this work, multilayer all-polymer laminates were assembled by alternative stacking of poly (methyl methacrylate) (PMMA) thin films and electrospun poly (vinylidene difluoride-co-hexafluoropropylene) (PVDF-co-HFP) membranes, where the nonwoven PVDF-co-HFP nanofibrous membranes were electrospun with an ionic liquid (1-allyl-3-methylimidazolium chloride (AMIM) to eliminate leakage currents and maximize the discharged energy density. The effects of the crystallography, microstructures and interfaces of the multilayer PMMA/PVDF-co-HFP laminates on the energy storage capacity were discussed.