Effect of filler content on morphology and physical–chemical characteristics of poly(vinylidene fluoride)/NaY zeolite-filled membranes

Lopes, Ana Catarina; Ribeiro, Clarisse; Sencadas, Vítor; Botelho, Gabriela; Lanceros‐Méndez, S.

doi:10.1007/s10853-014-8043-4

Cited by 32 publications

(26 citation statements)

References 45 publications

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“…[28] This phase transformation has been reported to take place at temperatures above 70 ºC in PVDF and has been related to the increase of cooperative segmental motions within the crystalline fraction. [29] It is to notice, nevertheless, that this decrease of ~20% of the -phase content does not represent a significant reduction of the electroactive performance of the material. Gomes et al [30] reported that the piezoelectric coefficient is proportional to the amount of oriented dipoles, and therefore the number of -phase present in PVDF films influence the piezoelectric response of the material.…”

Section: Effect Of Plasma Treatment On Pvdf Fiber Morphologymentioning

confidence: 92%

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: 92%

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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“…Similar results were observed for electrospun fibers from BaTiO 3 /poly(vinylidene fluoride-trifluorethylene) (PVDFTrFE) in which the increase of filler content does not affect the polymeric fiber mean diameter, but some clusters of BaTiO 3 were found on the surface of the PVDF-TrFE [21]. Furthermore, it was reported that the incorporation of NaY zeolite in electrospun poly(vinylidene fluoride) (PVDF) fibers lead to an increase of the average fiber diameter and even for filler concentration as small as 4 wt%, some clusters were also observed in the surface of the polymeric fiber matrix [22].…”

Section: Figurementioning

confidence: 99%

Development of electrospun photocatalytic TiO2-polyamide-12 nanocomposites

Cossich

Bergamasco

Amorim

et al. 2015

Materials Chemistry and Physics

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Titanium dioxide (TiO2) in different forms such as films, fibers or particles are being extensively studied for removal of contaminants from aquatic environments due to its outstanding photocatalytic activity. This work reports the development of TiO 2 -polyamide 12 electrospun fiber mats. A systematic study on the influence of electrospun processing parameters on polymer fiber morphology was performed. It was observed that the average fiber diameter is mainly influenced by polymer concentration and average fiber diameters between 404 ± 82 nm and 1442 ± 360 nm were obtained. Polyamide-12 (PA-12) was used as a polymer matrix and electrospun with 0, 10 and 20 wt% of TiO 2 . It was observed that the filler does not change the average fiber diameter, being similar to that observed for neat PA-12 fibers processed under the same experimental conditions. The TiO 2 were particles dispensed not only in the bulk of the polymeric matrix but also on the surface of the fibers, especially for the samples with higher filler contents. Neat and nanocomposite electrospun samples show a hydrophobic behavior and a degree of crystallinity of ~25%. The photocatalytic performance of the processed samples was measured by following the degradation capability of a chosen dye, methylene blue (MB). Results show that the nanocomposite samples have a remarkable photocatalytic activity, especially the one with a higher load of TiO 2 particles (20 wt%), with all MB being removed from the solution after 100 min. AbstractTitanium dioxide (TiO 2 ) in different forms such as films, fibers or particles are being extensively studied for removal of contaminants from aquatic environments due to its outstanding photocatalytic activity. This work reports the development of TiO 2 -polyamide 12 electrospun fiber mats. A systematic study on the influence of electrospun processing parameters on polymer fiber morphology was performed. It was observed that the average fiber diameter is mainly influenced by polymer concentration and average fiber diameters between 404±82 nm and 1442±360 nm were obtained.Polyamide-12 (PA-12) was used as a polymer matrix and electrospun with 0, 10 and 20 wt% of TiO 2 . It was observed that the filler does not change the average fiber diameter, being similar to that observed for neat PA-12 fibers processed under the same experimental conditions. The TiO 2 were particles dispensed not only in the bulk of the polymeric matrix but also on the surface of the fibers, especially for the samples with 2 higher filler contents. Neat and nanocomposite electrospun samples show a hydrophobic behavior and a degree of crystallinity of ~ 25%.The photocatalytic performance of the processed samples was measured by following the degradation capability of a chosen dye, methylene blue (MB). Results show that the nanocomposite samples have a remarkable photocatalytic activity, especially the one with a higher load of TiO 2 particles (20 wt%), with all MB being removed from the solution after 100 min.

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“…Therefore, β-phase has the most pronounced piezoelectric and pyroelectric properties and it is the desired phase that PVDF should have for utilization in relevant applications. Γ-phase has T 3 GT 3 G' configuration which induces dipole moment, which however is weaker than that of the β-phase [28,29]. Additionally, δ-phase is similar to α but more polar [29].…”

Section: Introductionmentioning

confidence: 99%

“…PVDF exhibits five different types of crystal structure, namely α, β, γ, δ and ε, each one having different characteristics [25][26][27][28][29][30]. The macromolecules in the α-phase have alternating trans and gauche configuration (TGTG'), thus they are non-polar [25][26][27]29].…”

Section: Introductionmentioning

confidence: 99%

“…The macromolecules in the α-phase have alternating trans and gauche configuration (TGTG'), thus they are non-polar [25][26][27]29]. In contrast, β-phase has all-trans (TTTT) planar zigzag configuration which creates a permanent dipole [25][26][27][28][29]. Therefore, β-phase has the most pronounced piezoelectric and pyroelectric properties and it is the desired phase that PVDF should have for utilization in relevant applications.…”

Section: Introductionmentioning

confidence: 99%

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Designing electrospun nanocomposite poly(vinylidene fluoride) mats with tunable wettability

Haddad

Svinterikos

Zuburtikudis

2017

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Effect of filler content on morphology and physical–chemical characteristics of poly(vinylidene fluoride)/NaY zeolite-filled membranes

Cited by 32 publications

References 45 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

Development of electrospun photocatalytic TiO2-polyamide-12 nanocomposites

Designing electrospun nanocomposite poly(vinylidene fluoride) mats with tunable wettability

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