Electron and proton irradiation of poly(vinylidene fluoride): characterization by electron paramagnetic resonance

Adem, E.; Burillo, Guillermina; Muñoz, Eduardo; Rickards, J.; Cota, L.; Avalos-Borja, M.

doi:10.1016/s0141-3910(03)00064-8

Cited by 32 publications

(23 citation statements)

References 7 publications

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“…In contrast, absorption spectra of NH display a wider peak towards higher wavelength due to more alternating double bonds as compared to PVDF at different doses . High concentration of free radicals in NH after irradiation, as revealed from EPR measurements, results in greater double bond formation in comparison to pure PVDF . However, the absorption intensity increases with increasing dose for both PVDF and NH, clearly indicating the formation of more olefinic double bonds at higher dose due to electron irradiation, and the higher intensity for NH suggests more such double bonds in NH as compared to pure PVDF.…”

Section: Resultsmentioning

confidence: 89%

Electron beam-induced piezoelectric phase in poly(vinylidene fluoride) nanohybrid: effect at the molecular level

et al. 2014

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Section: Resultsmentioning

confidence: 89%

Electron beam-induced piezoelectric phase in poly(vinylidene fluoride) nanohybrid: effect at the molecular level

et al. 2014

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“…This feature indicates that the polymer (i.e., PVDF) is composed of a combination of crystalline and amorphous phases. The PVDF data are in conformity with those of other authors . The crystallite size (D) was calculated using Scherer's formula using full‐width at half maximum (fWHM) intensity of the XRD pattern described by

D = \frac{true}{0.89 λ} β \cos θ

where λ = 1.5418 Å (for CuK α ) and β is fWHM at the diffraction angle θ.…”

Section: Resultsmentioning

confidence: 99%

Dielectric behavior and structural characterization of polymeric double layer thin films

Saxena¹,

Shukla

Gaur

2019

J of Applied Polymer Sci

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In the present work, various techniques have been employed to investigate the polarization processes along with the estimation of various parameters involved therein in polymethylmethacrylate (PMMA), polyvinylidenefluoride (PVDF), and PVDF‐PMMA double‐layered samples. Anticipating the difficulty to analyze the experimental data; in such complicated situation, when in one the same temperature range various decay mechanism may complete, the different techniques are used to interpret the experimental results. These measurements verify the various processes responsible polarization in these polymer samples. The structural morphology, crystallinity, atomic, and molecular geometry were analyzed using different characterization tools, namely SEM, XRD, FTIR, and DSC; therefore, the results were found to be in confirmation with amorphous nature of PMMA and semicrystalline nature of PVDF and PVDF‐PMMA double‐layered samples. Ac dielectric measurements were performed for different temperatures over the frequency range of 100 Hz to 10 kHz. Dielectric losses have also been recorded with a two terminal (Al‐Al) electrode combination. The study revealed that both interfacial phenomena and space charge mechanism are known to play preliminary role in the dielectric behavior of double‐layered samples. The amorphous–crystalline interface act as charge‐carrier trapping sites in this polymeric heterogeneous system. Dielectric permittivity and dielectric loss of the double‐layered sample depend manifolds on the temperature and the Ac frequency. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47724.

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“…Here we would like to report the results of ESR studies of the processes responsible for radiation-induced modification of the properties of ferroelectric PVDF. * corresponding author; e-mail: bhilczer@ifmpan.poznan.pl (89) Stable radicals in PVDF induced by ionizing radiation have been previously studied by optical, EPR, and ENDOR spectroscopy [4][5][6]. Irradiation was found to break the C-H and C-F bonds, leading to formation of in-chain radicals, whereas the scission of C-C bonds resulted in producing of end-chain radicals [5,7].…”

Section: Introductionmentioning

confidence: 99%

“…* corresponding author; e-mail: bhilczer@ifmpan.poznan.pl (89) Stable radicals in PVDF induced by ionizing radiation have been previously studied by optical, EPR, and ENDOR spectroscopy [4][5][6]. Irradiation was found to break the C-H and C-F bonds, leading to formation of in-chain radicals, whereas the scission of C-C bonds resulted in producing of end-chain radicals [5,7]. Some of the radicals become oxygenated in the air and the ESR spectra of PVDF have been described as composed of one or more types of radicals such as (-…”

Section: Introductionmentioning

confidence: 99%

Studies of Fast Electron Irradiated Ferroelectric Poly(Vinylidene Fluoride)

2005

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Radiation-induced functionalization of ferroelectric poly(vinylidene fluoride) was studied by ESR spectroscopy. The samples were irradiated in the high vacuum of a Van de Graaff accelerator with 1.0 MeV and 1.5 MeV electrons at room temperature and the decay of free radicals was studied after transferring the samples into the air. The samples exhibit a multicomponent ESR spectrum that can be decomposed into: a large asymmetric signal in the centre related to peroxy radicals, a quintet with hyperfine splitting A F = 4.3 mT centred at g = 2.004, assigned to the in-chain radical (-CF2-C• H-CF2-), and a triplet due to an end-chain (-C • H2) radical with A H = 1.6 mT and g = 2.009.

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Electron and proton irradiation of poly(vinylidene fluoride): characterization by electron paramagnetic resonance

Cited by 32 publications

References 7 publications

Electron beam-induced piezoelectric phase in poly(vinylidene fluoride) nanohybrid: effect at the molecular level

Electron beam-induced piezoelectric phase in poly(vinylidene fluoride) nanohybrid: effect at the molecular level

Dielectric behavior and structural characterization of polymeric double layer thin films

Studies of Fast Electron Irradiated Ferroelectric Poly(Vinylidene Fluoride)

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