Vinylidene Fluoride Polymers

Humphrey, John S.; Amin-Sanayei, Ramin

doi:10.1002/0471440264.pst392

Cited by 56 publications

(99 citation statements)

References 47 publications

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“…However, peaks derived from reverse head-to-head linkages are usually observed in VDF-based telomers, 21 oligomers 23 and copolymers. 2,3,24 Nevertheless, in the iodine transfer polymerization of VDF in the presence of C 6 F 13 I or C 6 F 13 CH 2 CF 2 I, reverse head-to-head additions were not observed. 13,14 The 1 H NMR spectrum of the telomer (Figure 2, lower spectrum) was in agreement with the results of 19 F NMR spectroscopy.…”

Section: Piezoelectric Properties Of Vdf Telomers N Durand Et Almentioning

confidence: 94%

“…Thus, PVDF has been used in high-tech applications, such as [1][2][3] paints and coatings, medical suture wires, mechanical substrates for fuel cell membranes, liners for containers used to carry corrosive substances (for example, bromine), separators for lithium ion batteries and backsheets for photovoltaic cells. In addition, PVDF is a piezoelectric polymer, 4,5 and pressure or mechanical stress can induce an electrical response.…”

Section: Introductionmentioning

confidence: 99%

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Vinylidene fluoride telomers for piezoelectric devices

Durand¹,

Améduri²,

Takashima³

et al. 2010

Polym J

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Original telomers based on vinylidene fluoride (VDF), C n F 2n+1 (VDF) m (CH 2 CH 2 ) p I, where n¼4 or 6, m¼5-23 and p¼0 or 1, were synthesized, and the piezoelectric properties of the materials were investigated. Low-molecular-weight polyvinylidene fluorides (PVDFs) were prepared in good yields by iodine transfer polymerization of VDF. The polymerization of VDF was conducted in the presence of 1-iodoperfluoroalkanes (C 4 F 9 I or C 6 F 13 I) and bis(4-tert-butylcyclohexyl) peroxydicarbonate, which were used as a chain transfer agent and initiator, respectively. The microstructures of VDF telomers were carefully characterized by 1 H and 19 F nuclear magnetic resonance (NMR) spectroscopy to assess the average molecular weights and the percentage of CH 2 CF 2 I functionality (that ranged from 47 to 86%). X-ray diffraction patterns of these telomers indicated that PVDFs with o7 VDF units displayed the a-form. Alternatively, telomers containing a higher amount of VDF possessed both a-and b-forms. Ethylene endcapping of C n F 2n+1 (VDF) m I was also successfully achieved in high yield, and the telomeric precursors were converted quantitatively. Moreover, three VDF telomers were vaporized into films, and the piezoelectric properties of the materials were assessed. The results revealed that C 6 F 13 (VDF) 23 I and C 4 F 9 (VDF) 21 I telomer films displayed piezoelectric responses (d 33 ¼268 pC N À1 ) and high remanent polarizations (Pr¼98.2 and 93.4 mC m À2 , respectively). In addition, C 4 F 9 (VDF) 21 C 2 H 4 I exhibited interesting ferroelectric properties (Pr¼89.9 mC m À2 ).

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Section: Piezoelectric Properties Of Vdf Telomers N Durand Et Almentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Vinylidene fluoride telomers for piezoelectric devices

Durand¹,

Améduri²,

Takashima³

et al. 2010

Polym J

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“…Therefore, the efforts of researchers are focused on the preparation and increasing the content of the β -phase. This phase is directly connected with the trans-conformations of the polymer chains [4][5][6]. It is well known from the literature that the addition of montmorillonite fillers to polymers can stabilize a metastable phase and induce polymorphism.…”

Section: Introductionmentioning

confidence: 99%

A comparison of two different methods for formation of the beta phase in nanocomposites based on vinylidene fluoride-hexafluoropropylene copolymer

Borisova

Kiryakova

Atanassov

2014

Materials Science-Poland

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Nanocomposite materials based on vinylidene fluoride-hexafluoropropylene copolymer and organically modified montmorillonite Cloisite ® 15A were prepared by two different methods: melt mixing and co-precipitation. The changes taking place in crystalline structure, tensile strength, thermal behavior and the formation of piezoelectric β -phase as a result of the polymer system dissolution in dimethyl sulfoxide were studied. The technological specificity of each method has certain effect on the properties of the obtained nanocomposites. The highest content of β -phase -95 % was achieved by co-precipitation from the solution of vinylidene fluoride-hexafluoropropylene copolymer in dimethyl sulfoxide and 6 mass % content of Cloisite ® 15A. Despite the common view that the use of solvents and prolonged technological procedure lead to overall higher expenses, the obtained nanocomposites could be promising for the preparation of new piezo-materials.

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“…One of the most important fluoropolymers used today is poly (vinylidene difluoride) (PVDF) [6] which is used in a number of applications where chemical resistance, mechanical strength and high creep resistance are required [7]. PVDF is used in piezoelectric sensors, chemically inert pipes and hoses in chemical refineries, wire jacketing for electrical components in areas with possible chemical attack and coatings for skyscraper exteriors [8]. In the off-shore oil and gas industry, PVDF is considered the prime sheathing material for flow, choke and kill lines due to chemical resistance and wide service temperature window (-20°C to 120°C).…”

Section: Introductionmentioning

confidence: 99%