Effect of rolling temperature on the microstructure and electric properties of β-polyvinylidene fluoride films

Lu, Yang; Qiu, Jinhao; Zhu, Kongjun; Ji, Hongli; Zhao, Qing; Shen, Mingxia; Zeng, Shaohua

doi:10.1007/s10854-018-9681-0

Cited by 14 publications

(36 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…attribute the slight decrease in ε to the lack of free movement of the electric dipoles due to a closer packing of the crystals induced by rolling. On the contrary, Peterlin and Elwell and Yang et al . argue that the improved order and packing of the polymer chains increase the dipole density leading to higher permittivity values.…”

Section: Resultsmentioning

confidence: 99%

“…However, despite the effectiveness of this method in yielding the β phase of PVDF, hard stretching conditions can promote the formation of defects within the polymer, leading to a deterioration of its electric performances. To remedy this, the exploitation of the rolling process has been proposed as an alternative method for promoting the phase transformation . In such a case, the deformation of the polymer chains, that induces the β phase formation, is generated by a transversal compression stress which results also in a longitudinal extensional stress.…”

Section: Resultsmentioning

confidence: 99%

“…The polymorphism of the PVDF matrix was investigated through this technique: as suggested by Cai et al . and other authors, the relative fraction of the electroactive phase ( F EA ), in terms of crystalline components, can be determined by:

F_{EA} = \frac{I_{EA}}{1.26 I_{α} + I_{EA}} * 100

where I EA is the absorbance of the band at about 840 cm −1 (assigned to β and/or γ phase), I α is the absorbance at 763 cm −1 (characteristic of the α phase), and 1.26 is the ratio between the absorption coefficients at the respective wavenumbers.…”

Section: Methodsmentioning

confidence: 99%

“…To remedy this, the exploitation of the rolling process has been proposed as an alternative method for promoting the phase transformation. 4,5 In such a case, the deformation of the polymer chains, that induces the β phase formation, is generated by a transversal compression stress which results also in a longitudinal extensional stress.…”

Section: Articlementioning

confidence: 99%

“…Besides the application of high electric fields, crystallization from solvents at temperatures below 70 °C and blending with others polymers, other strategies are employed to promote the formation of the β phase, involving the use of mechanical stresses. In particular, as reported in literature, stretching or rolling are widely used to induce the formation of β phase from the α phase or to increase the electroactive form amount. Most of these studies are focused on the neat PVDF polymer.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

PVDF‐based composites containing PZT particles: How processing affects the final properties

Brunengo

Castellano

Conzatti

et al. 2020

J of Applied Polymer Sci

View full text Add to dashboard Cite

Poly(vinylidene fluoride) (PVDF)‐based composites containing up to 30 vol % of lead zirconate titanate (PZT) particles were prepared by: (a) different techniques, melt blending and solvent casting; and (b) different molding procedures, a single‐step and a two‐step hot‐pressing method. The obtained samples were characterized in order to study how the processing affects their final properties. Results indicate that the different molding processes have a strong effect on polymorphism and molecular relaxations of PVDF as well as on dielectric response of the composite materials, that results enhanced by the two‐step molding. The preparation technique influences the filler dispersion and, consequently, the elastic modulus of the composites, but without remarkably impacting on other properties. This suggests the possibility of preparing performing composites by a solvent‐free and easily scalable technique (i.e., melt blending) and obtaining suitable dielectric characteristics, very important for application of such kind of materials, just by tuning the molding conditions. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 137, 48871.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

F_{EA} = \frac{I_{EA}}{1.26 I_{α} + I_{EA}} * 100

Section: Methodsmentioning

confidence: 99%

Section: Articlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

PVDF‐based composites containing PZT particles: How processing affects the final properties

Brunengo

Castellano

Conzatti

et al. 2020

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

Improved dielectric properties of poly(vinylidene fluoride)–BaTiO₃ composites by solvent‐free processing

Brunengo

Conzatti

Schizzi

et al. 2020

J of Applied Polymer Sci

View full text Add to dashboard Cite

Composites of poly(vinylidene fluoride) (PVDF) and BaTiO3 nanoparticles (average diameter ca. 125 nm) are fabricated by a solvent‐free and industrially scalable technique, that is, melt blending, followed by compression molding. The effect of processing parameters on the spectroscopic, microstructural, thermal, mechanical and dielectric properties are evaluated as a function of composition (loading up to 30 vol%). The presence of nanoparticle inclusions as well as specific compression molding parameters demonstrate both to affect the molecular relaxations of the PVDF matrix, studied by correlating the results of different techniques, and to induce the PVDF crystallization as β phase. Processing parameters also play a key role for optimizing the dielectric properties. An improved dielectric behavior of the composites is obtained in terms of both permittivity, whose value increases up to four times that of neat PVDF, and dielectric losses, lower than 5% between 10 and 3·104 Hz. The obtained performances resulted enhanced compared to analogous composites prepared with the use of solvents.

show abstract

Advantages and limitations of active phase silanization in PVDF composites: Focus on electrical properties and energy harvesting potential

Petrovic,

Craciun,

Cordero

et al. 2023

Polymer Composites

View full text Add to dashboard Cite

In order to further improve the performance of 0.94[(Bi0.5Na0.5)TiO3]‐0.06BaTiO3/polyvinylidene fluoride (NBT‐BT/PVDF) flexible composite films prepared by the hot‐pressing method, the effect of surface modification of the NBT‐BT particles on the structure and properties of the films was investigated. Two coupling agents, namely, (3‐aminopropyl)triethoxysilane (APTES) and dodecyl triethoxysilane (DDTES) were added to enhance dispersion and interfacial adhesion of the active phase powder with the polymer matrix. The highest amount of the electroactive PVDF β‐phase was formed in APTES‐modified samples while in DDTES samples mainly γ‐phase was formed as shown by Fourier‐transform infrared spectroscopy analysis. Differential scanning calorimetry measurements indicated that the addition of filler particles reduced the total crystallinity degree of the PVDF. Dielectric permittivity values as well as dielectric losses decreased for silanized samples due to reduced tension at the interface between particles and polymer. Strong intermolecular interaction between the PVDF chains and the APTES‐modified particles led to enhanced breakdown strength of these samples. The highest level of agglomeration in the DDTES‐modified samples induced the deterioration of ferroelectric properties. The highest voltage output of ~15 V and 225 μW of power was obtained for the APTES‐modified harvester, evidencing their potential for energy harvesting applications.Highlights Surface of NBT‐BT particles was successfully modified by the silanization method. NBT‐BT‐PVDF flexible lead‐free composite films were prepared by hot pressing. APTES coupling agent enabled the transformation of PVDF α‐phase into electro‐active β. APTES‐modified samples showed the highest breakdown strength. Notable properties for energy harvesting application found, up to 225 μW of generated power.

show abstract

Effect of rolling temperature on the microstructure and electric properties of β-polyvinylidene fluoride films

Cited by 14 publications

References 36 publications

PVDF‐based composites containing PZT particles: How processing affects the final properties

PVDF‐based composites containing PZT particles: How processing affects the final properties

Improved dielectric properties of poly(vinylidene fluoride)–BaTiO₃ composites by solvent‐free processing

Advantages and limitations of active phase silanization in PVDF composites: Focus on electrical properties and energy harvesting potential

Contact Info

Product

Resources

About

Effect of rolling temperature on the microstructure and electric properties of β-polyvinylidene fluoride films

Cited by 14 publications

References 36 publications

PVDF‐based composites containing PZT particles: How processing affects the final properties

PVDF‐based composites containing PZT particles: How processing affects the final properties

Improved dielectric properties of poly(vinylidene fluoride)–BaTiO3 composites by solvent‐free processing

Advantages and limitations of active phase silanization in PVDF composites: Focus on electrical properties and energy harvesting potential

Contact Info

Product

Resources

About

Improved dielectric properties of poly(vinylidene fluoride)–BaTiO₃ composites by solvent‐free processing