Piezoelectricity in crystallizing ferroelectric polymers: Poly(vinylidene fluoride) and its copolymers (A review)

Kochervinskiĭ, V. V.

doi:10.1134/1.1595194

Cited by 130 publications

(97 citation statements)

References 84 publications

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“…Ferroelectricity 1,2 and high piezo-and pyroactivity in these compounds, along with specific properties of polymers, allow to use them as a material for various energy converters. 3,4 Mechanisms of ferroelectricity and piezoelectricity are still not clearly understood, 2,5,6 particularly the role of molecular mobility in crystalline and especially in the amorphous phase is not clear in these phenomena. Therefore, investigation of mechanisms of molecular dynamics in considered class of polymers is actual.…”

Section: Introductionmentioning

confidence: 98%

Dielectric relaxation in vinylidene fluoride–hexafluoropropylene copolymers

Kochervinskiĭ

Malyshkina

Markin

et al. 2007

J of Applied Polymer Sci

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The molecular mobility in copolymers of vinylidene fluoride-hexafluoropropylene VDF/HFP of 93/7 and 86/14 ratios has been investigated by means of broadband dielectric relaxation spectroscopy (10 À1 -10 7 Hz), differential scanning calorimetry DSC (À100 to 1508C), and of wide angle X-ray diffraction WAXS. Four relaxation processes and one ferroelectric-paraelectric phase transition have been detected. The process of the local mobility b-(at temperatures below glass transition point) is not affected by chemical composition of the copolymer and the formed structure. Parameters of segmental mobility in the region of glass transition (a a -relaxation) depend on the ratio of comonomer with lower kinetic flexibility. a c -relaxation is clearly observed only in VDF/HFP 93/7 copolymer, which is characterized by a higher crystallinity and a higher perfection of crystals of a-(a p -) phase. Diffuse order-disorder relaxor type ferroelectric transition connected with the destruction of the domains in low-perfect ferroelectric phase in the amorphous regions has been detected for both copolymers. An intensive relaxation process (a-process) was observed for both copolymers in high-temperature region. DSC data shows that it falls on the broad temperature region of aphase crystals melting. It is considered to be connected with the space charge relaxation.

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Section: Introductionmentioning

confidence: 98%

Dielectric relaxation in vinylidene fluoride–hexafluoropropylene copolymers

Kochervinskiĭ

Malyshkina

Markin

et al. 2007

J of Applied Polymer Sci

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“…Among the most interesting clues to be provided to specific cells, such as mechanical [9] and (bio)chemical [10], electrical clues have already proven to be important in TE applications [11,12]. In that sense, piezoelectric polymers, materials that generate a voltage under mechanical loading without the need of electrodes or external power source, offer a unique opportunity to deliver electrical cues directly to cells [13].…”

Section: Introductionmentioning

confidence: 99%

Strategies for the development of three dimensional scaffolds from piezoelectric poly(vinylidene fluoride)

et al. 2016

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Cell supports based on electroactive materials, that generate electrical signal variations as a response to mechanical deformations and vice-versa, are gaining increasing attention for tissue engineering applications. In particular, poly(vinylidene fluoride), PVDF, has been proven to be suitable for these applications in the form of films and two-dimensional membranes. In this work, several strategies have been implemented in order to develop PVDF three-dimensional scaffolds. Three processing methods, including solvent casting with particulate leaching and three-dimensional nylon, and freeze extraction with poly(vinyl alcohol) templates are presented in order to obtain three-dimensional scaffolds with different architectures and interconnected porosity. Further, it is shown that the scaffolds are in the electroactive β-phase and show a crystallinity degree of ~ 45%. Finally, quasi-static mechanical measurements showed that an increase of the porous size within the scaffold leads to a tensile strengths and the Young's modulus decrease, allowing tuning scaffold properties for specific tissues.

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“…( Equation 1) where D is the electric induction; E is the electric field strength; X is the mechanical stress; and is the strain [35]. In this sense, it is possible observe that the piezoelectricity is the relation between the electrical variables (D and E) and the mechanical parameters (X and ).…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric polymers as biomaterials for tissue engineering applications

Ribeiro

Sencadas

Correia

et al. 2015

Colloids and Surfaces B: Biointerfaces

423

338

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Tissue engineering often rely on scaffolds for supporting cell differentiation and growth. Novel paradigms for tissue engineering include the need of active or smart scaffolds in order to properly regenerate specific tissues. In particular, as electrical and electromechanical clues are among the most relevant ones in determining tissue functionality in tissues such as muscle and bone, among others, electroactive materials and, in particular, piezoelectric ones, show strong potential for novel tissue engineering strategies, in particular taking also into account the existence of these phenomena within some specific tissues, indicating their requirement also during tissue regeneration. This referee reports on piezoelectric materials used for tissue engineering applications. The most used materials for tissue engineering strategies are reported together with the main achievements, challenges and future needs for research and actual therapies. This review provides thus a compilation of the most relevant results and strategies and a start point for novel research pathways in the most relevant and challenging open questions. This referee reports on piezoelectric materials used for tissue engineering applications.The most used materials for tissue engineering strategies are reported together with the main achievements, challenges and future needs for research and actual therapies. This referee provides thus a compilation of the most relevant results and strategies and a start point for novel research pathways in the most relevant and challenging open questions.

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Piezoelectricity in crystallizing ferroelectric polymers: Poly(vinylidene fluoride) and its copolymers (A review)

Cited by 130 publications

References 84 publications

Dielectric relaxation in vinylidene fluoride–hexafluoropropylene copolymers

Dielectric relaxation in vinylidene fluoride–hexafluoropropylene copolymers

Strategies for the development of three dimensional scaffolds from piezoelectric poly(vinylidene fluoride)

Piezoelectric polymers as biomaterials for tissue engineering applications

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