Electroactive phases of poly(vinylidene fluoride): Determination, processing and applications

Martins, P.; Lopes, Ana Catarina; Lanceros‐Méndez, S.

doi:10.1016/j.progpolymsci.2013.07.006

Cited by 2,711 publications

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References 190 publications

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“…Furthermore, no complete fiber melting was detected after plasma treatments, the PVDF chemical structure is composed by the repetition unit -CH 2 -CF 2 -along the polymer chain and the characteristic vibrational modes can be used to identify the presence of different polymorphs. [6] Figure 3 shows the infrared spectra of the pristine and no traces of the -phase (776, 812, 833-838 and 1234 cm −1 modes) appears. [6,22] The electrospinning method favors the formation of PVDF fibers crystallized in the electroactive β-phase [6,22] , due to the fact of being a low temperature solvent casting process.…”

Section: Effect Of Plasma Treatment On Pvdf Fiber Morphologymentioning

confidence: 99%

“…[6] Figure 3 shows the infrared spectra of the pristine and no traces of the -phase (776, 812, 833-838 and 1234 cm −1 modes) appears. [6,22] The electrospinning method favors the formation of PVDF fibers crystallized in the electroactive β-phase [6,22] , due to the fact of being a low temperature solvent casting process. Moreover, the use of higher electric fields during processing contribute to dipole alignment and consequently to electrical poling of the PVDF fibers [25] , leading to high responsive piezoelectric fibers.…”

Section: Effect Of Plasma Treatment On Pvdf Fiber Morphologymentioning

confidence: 99%

“…[1][2][3][4][5] This polymer has at least four known crystalline phases (α, β, γ and δ), being the β phase the one with the largest piezoelectric response. [3,6] PVDF has been used in various fields including tissue engineering, filtration, air cleaning, rechargeable batteries and sensors, among others. [5,[7][8] In particular, electrospun PVDF fiber mats have attracted a large interest due to their high surface area, small fiber diameters and porous structure.…”

Section: Introductionmentioning

confidence: 99%

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Influence of oxygen plasma treatment parameters on poly(vinylidene fluoride) electrospun fiber mats wettability

Correia

Ribeiro

Sencadas

et al. 2015

Progress in Organic Coatings

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Lanceros-Méndez, S. (2015). Influence of oxygen plasma treatment parameters on poly(vinylidene fluoride) electrospun fiber mats wettability. Progress in Organic Coatings, 85 151-158.Influence of oxygen plasma treatment parameters on poly(vinylidene fluoride) electrospun fiber mats wettability AbstractElectrospun poly(vinylidene fluoride) (PVDF) fiber mats found applications in an increasing number of areas, such as battery separators, filtration and detection membranes, due to their excellent properties. However, there are limitations due to the hydrophobic nature and low surface energy of PVDF. In this work, oxygen plasma treatment has been applied in order to modify the surface wettability of PVDF fiber mats and superhydrophilic PVDF electrospun membranes have been obtained. Further, plasma treatment does not significantly influences fiber average size (~400 ± 200 nm), morphology, electroactive B-phase content (~80-85%) or the degree of crystallinity (Xc of 42 ± 2%), allowing to maintain the excellent physic-chemical characteristics of PVDF. Plasma treatment mainly induces surface chemistry modifications, such as the introduction of oxygen and release of fluorine atoms that significantly changes polymer membrane wettability by a reduction of the contact angle of the polymer fibers and an overall decrease of the surface tension of the membranes.

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Section: Effect Of Plasma Treatment On Pvdf Fiber Morphologymentioning

confidence: 99%

Section: Effect Of Plasma Treatment On Pvdf Fiber Morphologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of oxygen plasma treatment parameters on poly(vinylidene fluoride) electrospun fiber mats wettability

Correia

Ribeiro

Sencadas

et al. 2015

Progress in Organic Coatings

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“…That means both α-and β-phase existed in the resultant membranes, as 763 and 862 cm −1 were the adsorption bands of α-phase and 840 and 862 cm −1 indicate the presence of β-phase. 37,40 Meanwhile, the polymorphs showed no variation as the exposure duration increased because no obvious variation can be found in the position of the characteristic peaks. However, the β-phase content varied as can be found in Table 2; it was about 90% for membranes M1− M5, indicating that the β-phase was the dominant polymorph in all PVDF-CTFE membranes, while it decreased as the exposure duration was higher than 180 s, which may result from the polymer crystallization process and the aggregate of the crystals in membrane which will be discussed in the SEM micrographs in Figure 2.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

“…Then the crucible was placed in the instrument and heated from 80 to 250°C at a rate of 10°C /min. The heat flow was recorded, and then the crystallinity χ was calculated by the following equation 40 …”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Preparation of Interconnected Biomimetic Poly(vinylidene fluoride-co-chlorotrifluoroethylene) Hydrophobic Membrane by Tuning the Two-Stage Phase Inversion Process

Zheng

Wang²,

et al. 2016

ACS Appl. Mater. Interfaces

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A facile strategy was applied for poly(vinylidene fluoride-cochlorotrifluoroethylene) (PVDF-CTFE) hydrophobic membrane preparation by tuning the two-stage phase inversion process. The exposure stage was found to benefit the solid−liquid demixing process (gelation/crystallization) induced by the solvent evaporation and the subsequent phase inversion induced by immersion benefit the liquid−liquid demixing. It was confirmed that the electrospun nanostructure-like biomimetic surface and interconnected pore structure can be expected by controlling the exposure duration, and 300 s was considered as the inflection point of exposure duration for PVDF-CTFE membrane through which a tremendous variation would show. The micro/ nanohierarchical structure in the membrane surface owing to the crystallization of PVDF-CTFE copolymer was responsible for the improvement of membrane roughness and hydrophobicity. Meanwhile, the interconnected pore structure in both the surface and the cross-section, which were formed because of the crystallization process, offers more mass transfer passages and enhances the permeate flux. The membrane then showed excellent MD performance with high permeate flux, high salt rejection, and relatively high stability during a 48 h continuous DCMD operation, according to the morphology, pore structure, and properties, which can be a substitute for hydrophobic membrane application.

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Poly(vinylidene fluoride) Nanocomposites

Nandi

Manna

2018

Encyclopedia of Polymer Science and Technology

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This article overviews the current research trends in the field of electroactive polymer poly(vinylidene fluoride) (PVDF) composites with various nanofillers, such as clay, carbon nanotube, graphene, and inorganic nanoparticles. Here we give a concise account on the preparation and properties of different nanocomposites, highlighting some of their applications. Important aspects such as PVDF nanocomposite properties, morphology, structure, thermal stability, mechanical properties, phase transitions, crystallinity, conductivity, dielectric permittivity, piezoelectric polymorph formation, electromagnetic induction shielding etc. are discussed. Particular emphasis is given on the piezoelectric β‐phase formation and the subsequent improvement of mechanical properties, conductivity, dielectric permittivity, and electromagnetic shielding, which are of interest in the application of PVDF nanocomposites in both commodity and technological fields. Apart from the binary nanocomposites, ternary nanocomposites containing two nanofillers and their synergistic effect on PVDF properties are also discussed.

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Electroactive phases of poly(vinylidene fluoride): Determination, processing and applications

Cited by 2,711 publications

References 190 publications

Influence of oxygen plasma treatment parameters on poly(vinylidene fluoride) electrospun fiber mats wettability

Influence of oxygen plasma treatment parameters on poly(vinylidene fluoride) electrospun fiber mats wettability

Preparation of Interconnected Biomimetic Poly(vinylidene fluoride-co-chlorotrifluoroethylene) Hydrophobic Membrane by Tuning the Two-Stage Phase Inversion Process

Poly(vinylidene fluoride) Nanocomposites

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