The crystalline phase transformation of poly(vinylidene fluoride)/poly(vinyl fluoride) blend films

Kim, Bong Shik; Lee, Jae Yeon; Porter, Roger S.

doi:10.1002/pen.10306

Cited by 12 publications

(11 citation statements)

References 26 publications

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“…It is known that some crystalline polymers transform from one phase to another under stress and deformation 2, 4, 7–11, 14, 15. When the α‐PVDF film is drawn at temperatures lower than 100°C, transformation from α‐phase into the β‐phase occurs for draw ratios 3 or 4 8, 14.…”

Section: Resultsmentioning

confidence: 99%

“…Since the piezoelectric polymers have low acoustic and mechanical impedance, they are widely used in medical and underwater systems. PVDF is a very important material, due to its piezoelectric and pyroelectric characteristics when appropriately oriented 1–10. PVDF has four different crystalline modifications (α, β, γ, and δ) 7–15.…”

Section: Introductionmentioning

confidence: 99%

“…The γ‐phase may be produced by crystallization from the melt at high pressure or by crystallization from certain solutions such as dimethylacetamide and dimethylsulfoxide 7, 8, 11, 13, 15. The δ‐phase can be obtained by poling the α‐phase at high electric fields 7–9, 11, 13, 15. The β‐phase, which has a planar zig‐zag structure, has a much higher dipole moment compared to α‐phase.…”

Section: Introductionmentioning

confidence: 99%

“…PVDF is a very important material, due to its piezoelectric and pyroelectric characteristics when appropriately oriented. [1][2][3][4][5][6][7][8][9][10] PVDF has four different crystalline modifications (a, b, g, and d). [7][8][9][10][11][12][13][14][15] The most common and most studied of these crystalline modifications are the aand b-phases.…”

Section: Introductionmentioning

confidence: 99%

“…2,7,8,11,13,14 The b-phase can be obtained through mechanical drawing a phase films. 2,[7][8][9][10][11][13][14][15] The g-phase may be produced by crystallization from the melt at high pressure or by crystallization from certain solutions such as dimethylacetamide and dimethylsulfoxide. 7,8,11,13,15 The dphase can be obtained by poling the a-phase at high electric fields.…”

Section: Introductionmentioning

confidence: 99%

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The effect of uniaxial orientation on the dielectric relaxation behavior of α‐PVDF

Özkazanç

Güney

Oskay

et al. 2008

J of Applied Polymer Sci

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a-crystalline phase poly(vinylidene fluoride) (PVDF) film was oriented uniaxially at different draw ratios. Morphological effects of orientation were investigated by X-ray diffraction and differential scanning calorimetry (DSC) measurements on the oriented samples. The dielectric loss factor was measured from 100 Hz to 1 MHz range between 80 and 400 K as a function of frequency and temperature. While the activation energy of the arelaxation transition was not affected by the orientation, it was observed that there is a linear increase in the activation energy of the b-relaxation transition with draw ratio. The relaxation time of the b-relaxation transition was more affected by the orientation process at lower temperatures.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The effect of uniaxial orientation on the dielectric relaxation behavior of α‐PVDF

Özkazanç

Güney

Oskay

et al. 2008

J of Applied Polymer Sci

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Crystallization of Poly(vinylidene fluoride) in Blends with Poly(methyl methacrylate‐co‐methacrylic acid) Copolymers

Landis

March

Dakshinamoorthy

et al. 2013

Macro Chemistry & Physics

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A series of poly(methyl methacrylate-co -methacrylic acid) (PMMA-co -MAA) random copolymers ranging in MAA content from 0-15 mol% is synthesized and blended with poly(vinylidene fl uoride) (PVDF). Using infrared spectroscopy, it is observed that the absorption bands attributed to hydrogen-bonded carbonyl groups increase in intensity as the amount of MAA in the copolymer increases. In DSC analysis, the crystallization temperature of the PVDF in the blend initially decreases by ca. 12 °C with MAA contents ranging from 0 to 5.5 mol%; however, a PVDF blend with a 15 mol% MAA copolymer has a crystallization temperature that is only ca. 3 °C below that of pure PVDF. Similarly, spherulitic growth rate analysis initially shows a decrease in radial growth rate for PVDF in blends with PMMA-co -MAA copolymers containing less than 5.5 mol% MAA. At higher MAA copolymer contents, the spherulitic growth rate approaches that of pure PVDF. It is concluded that the presence of the MAA comono mer in the PMMA-co -MAA copolymer initially (<5.5 mol% MAA) increases the intermolecular interactions between the copoly mer and the PVDF. However, as the MAA content of the copolymer rises above 5.5 mol%, intramolecular hydrogen bonding interactions within the PMMA-co -MAA copolymer cause the copoly mer to be less compatible with PVDF. been used as architectural coatings due to the excellent weathering characteristics of the partially fl uorinated PVDF blend component. [ 1 ] In these coatings applications, the degree of mixing and processing conditions of the coating can alter the crystallinity of the PVDF in the blend. [ 2 ] These variations in the crystallinity can affect the fi nal performance of the architectural coating; therefore, it is important to understand the interaction of the blend components as they pertain to the degree of mixing and crystallization. Due to the low entropy of mixing, most polymer blends will not form miscible blends unless strong intermolecular interactions exist between the blend components. These interactions can cause the blend to exhibit miscibility over a large range of composition. Studies have shown that dipole-dipole interactions between PVDF and the carbonyl group of PMMA can result in melt-compatible mixtures. [ 3 ] Relative to pure

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Polyvinylidene fluoride, an advanced futuristic smart polymer material: A comprehensive review

Nivedhitha

Jeyanthi

2022

Polymers for Advanced Techs

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There was a fast development of various piezoelectric materials in the past two decades due to their numerous applications. Piezoelectric materials made up of natural quartz crystals were used in ultrasonic detectors in the early days. Later, the modern synthetic piezoelectric materials known as ferroelectric ceramics, such as Lead zirconate titanate (PZT), were developed, which were capable of exhibiting piezoelectricity several times greater than natural crystals. Later, the declination of ceramics began as they contained large amounts of lead content, which was considered harmful to both humans and the environment. Finally, a new era in the history of piezoelectric materials boomed with the outbreak of polymer materials. Polyvinylidene fluoride (PVDF) is a piezoelectric polymer material that has drawn the attention of researchers, from the family of fluoropolymers and has paved a new path in the field of polymer science and technology. PVDF has earned the renown of being an excellent piezoelectric material due to its unique and versatile exhibition of piezoelectric and dielectric properties. Furthermore, PVDF can exhibit incredible thermal stability and mechanical strength with flexible processing and low cost compared with the other piezoelectric crystals and ceramics. This comprehensive review mainly focuses on the evolution of piezoelectric materials from crystals to polymers with their advantages and significant drawbacks. Thus, the main objective of this review is to present a detailed description of PVDF concerning its uniqueness as a piezoelectric material and versatile properties, followed by various advanced fabrication techniques and their impact on doping various nanofillers with respective applications. Though PVDF is renowned for its significant applications such as sensors, actuators, energy harvesting and biomedical devices, a tabular chart has been specially framed in one‐liners which highlights the real‐time experimental outcomes where PVDF can be specified as a futuristic polymer for multifunctional applications. A few reports resulted that with increasing graphite and MWCNT fillers into PVDF film, the EMI shielding effectiveness value rose to 14.64 dB at a frequency of 8‐12 Hz. A few reports resulted that by adding ZnO and BaTiO3, the electrical output increased significantly, which is more suitable as a nanogenerator. After an extensive literature survey, we found that reviews are very limited and restricted to specific applications and properties. This review is an overall brief explanation of enormous research works carried out by various experts and presented in a modest way with pictorial and tabular representation for the convenience of researchers. Finally, this review attempts to provide source material to direct researchers towards a fertile area of research with a better understanding of the fundamentals and advancement of polymer piezoelectric materials.

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The crystalline phase transformation of poly(vinylidene fluoride)/poly(vinyl fluoride) blend films

Cited by 12 publications

References 26 publications

The effect of uniaxial orientation on the dielectric relaxation behavior of α‐PVDF

The effect of uniaxial orientation on the dielectric relaxation behavior of α‐PVDF

Crystallization of Poly(vinylidene fluoride) in Blends with Poly(methyl methacrylate‐co‐methacrylic acid) Copolymers

Polyvinylidene fluoride, an advanced futuristic smart polymer material: A comprehensive review

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