Relaxational behaviour of polyvinylidene fluoride

Callens, A.; Batist, R. De; Eersels, L.

doi:10.1007/bf02722512

Cited by 13 publications

(25 citation statements)

References 10 publications

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“…Therefore, the variation of other physical properties with temperature must also be investigated. The other parameters, which describe elastic properties (e.g., elastic stiffness constant, elastic modulus, and loss factors), have been frequently used in the investigation of the transitional behavior of solid polymers 2, 15, 16, 19, 42…”

Section: Resultsmentioning

confidence: 99%

“…The investigations on the relaxation behavior of PVDF by other techniques were carried out and speculative hypothesis was purposed about observed relaxation processes 2, 8, 16–18, 44. It is difficult to compare this study directly with the studies published before because all of the previous investigations were carried out with a different method and at a low frequency.…”

Section: Resultsmentioning

confidence: 99%

“…It is this structure which makes it a good dielectric material. PVDF has four different type of crystalline modifications called α, β, γ, and δ 1–7. These different crystalline forms affect directly thermal, mechanical and electrical properties of the structure 8, 9.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the semi crystalline structure in the PVDF causes a different relaxation spectrum, when compared with the other thermoplastic polymers 14, 15. The relaxation behavior of PVDF has been investigated by various techniques 2, 8, 9, 16–18. Different methods have been used for the investigation of mechanical and dielectric relaxation of PVDF (e.g., for the mechanical relaxation, dynamical mechanical measurements (torsion pendulum), stress‐relaxation measurements, calorimetric measurements (DSC), and thermal expansion measurements; for dielectric relaxation, thermo‐stimulated depolarization current measurements (TSD), thermo‐stimulated current spectroscopy (TSC), capacitance measurements (three terminal capacitance bridge), and dielectric measurements (DEA)) 2, 6, 8, 16–23.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the physical properties of polymers must be investigated in a wide range of these variables. Mechanical relaxation experiments for PVDF have been made in static techniques or at low frequencies (0.1–1 kHz) 2, 8–10. However, elastic properties of the other thermoplastic polymers (e.g., PE, PMMA, PS, PVC, and PTFE) have been investigated in a wide range of temperature and frequency 19, 25–36.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Elastic properties and mechanical relaxation behaviors of PVDF (poly (vinylidene fluoride)) at temperatures between −20 and 100 °C and at 2 MHz ultrasonic frequency

Güney

2005

J Polym Sci B Polym Phys

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The elastic properties of PVDF have been investigated as a function of temperature. The propagation velocity and absorption of longitudinal and transverse ultrasonic waves have been measured at a constant frequency of 2 MHz and temperatures between –20 and 100 °C. Hence, the temperature dependences of storage and loss elastic constants have been obtained for temperatures between –20 and 100 °C. It has been seen that the relaxation behavior is affected from the form of mechanical disturbance. For the longitudinal mode, only one relaxation peak at 42 °C, but for transverse mode three relaxation peaks at 28 °C, 60 °C, and 94 °C have been observed. The results have been compared with the literature values obtained previously for PVDF. © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 43: 2862–2873, 2005

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Elastic properties and mechanical relaxation behaviors of PVDF (poly (vinylidene fluoride)) at temperatures between −20 and 100 °C and at 2 MHz ultrasonic frequency

Güney

2005

J Polym Sci B Polym Phys

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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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Investigation of dielectric relaxations associated with the glass transition of vinylidene fluoride and trifluoroethylene copolymers by thermally stimulated current

Teyssèdre

Bernès

Lacabanne

1995

J Polym Sci B Polym Phys

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Thermostimulated current (TSC) spectroscopy was applied to the characterization of dielectric relaxations associated with the glass transition of a series of P(VDF/TrFE) copolymers. The maximum temperature of the β‐mode increases slightly as the TrFE unit content is increased, in the same manner as the glass transition temperature. By using the technique of fractional polarizations to the resolution of this relaxation mode, we have isolated, for all the polymers investigated, a series of elementary relaxation times that obey a compensation law. This behavior is characteristic of the free amorphous phase of polymers. The mean activation energy of this mode increases as the TrFE unit content is increased, due to a stiffening of molecular chains. Annealing of the copolymers above their ferroelectric‐to‐paraelectric transition induces a strong crystallinity increase of the materials. As a matter of fact, the amorphous phase is squeezed in to dimensions lower than the characteristic length scale associated with the glass transition. © 1995 John Wiley & Sons, Inc.

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Relaxational behaviour of polyvinylidene fluoride

Cited by 13 publications

References 10 publications

Elastic properties and mechanical relaxation behaviors of PVDF (poly (vinylidene fluoride)) at temperatures between −20 and 100 °C and at 2 MHz ultrasonic frequency

Elastic properties and mechanical relaxation behaviors of PVDF (poly (vinylidene fluoride)) at temperatures between −20 and 100 °C and at 2 MHz ultrasonic frequency

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

Investigation of dielectric relaxations associated with the glass transition of vinylidene fluoride and trifluoroethylene copolymers by thermally stimulated current

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