Radiative defluorination of poly (vinylidene fluoride) under soft X-ray radiation

Chebotaryov, S.; Байтингер, Е. М.; Volegov, A.A.; Margamov, I. G.; Gribov, I.V.; Moskvina, N. A.; Kuznetsov, V. L.; Evsyukov, S. E.; Песин, Л. А.

doi:10.1016/j.radphyschem.2005.12.051

Cited by 13 publications

(4 citation statements)

References 8 publications

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“…Therefore, the O and C content ratio ([O]/[C] ratio) of PE increased from 0.0039 to 0.0244, while the F and C content ratio ([F]/[C] ratio) of PVDF and PTFE decreased from 0.883 to 0.871 and 1.867 to 1.859, respectively, after increasing the absorbed dose. This reduction in F content could be attributed to the defluorination of PVDF and PTFE by gamma-ray irradiation [ 41 , 42 ].…”

Section: Resultsmentioning

confidence: 99%

A Comparative Study of Gamma-Ray Irradiation-Induced Oxidation: Polyethylene, Poly (Vinylidene Fluoride), and Polytetrafluoroethylene

et al. 2022

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Radiation techniques are used to modify the physical, chemical and biological properties of polymers. This induces crosslinking and degradation reactions of polymers by utilizing radicals generated through ionizing radiation. However, oxidation products (such as carbonyl) can be formed because oxidation occurs by chain scission in the presence of oxygen. Herein, we demonstrate the gamma-ray irradiation-induced oxidation with and without fluorine using polyethylene, polyvinylidene fluoride and polytetrafluoroethylene under the same conditions. In this study, changes in element-content and chemical-bond structures were analyzed before and after gamma-ray irradiation under air atmosphere. As a result, polytetrafluo-roethylene showed less oxidation and excellent thermal properties after the absorbed dose of 500 kGy. This can be attributed to the generation of stable perfluoroalkylperoxy radicals after gamma ray irradiation in the PTFE structure containing only CF2 groups, thereby hindering the oxidation reaction.

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Section: Resultsmentioning

confidence: 99%

A Comparative Study of Gamma-Ray Irradiation-Induced Oxidation: Polyethylene, Poly (Vinylidene Fluoride), and Polytetrafluoroethylene

et al. 2022

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“…There are two main routes of PVDF carbonization: radiative (irradiation with photons and bombardment with microparticles of different masses and energies) [18][19][20][21][22][23][24][25][26][27] and chemical [1,[28][29][30][31][32][33][34] ones. PVDF contains the equal number of fluorine and hydrogen atoms which are able to separate from the carbon backbone in the form of hydrogen fluoride as a result of radiative or chemical effect.…”

Section: Introductionmentioning

confidence: 99%

Ageing of chemically modified poly(vinylidene fluoride) film: Evolution of triple carbon-carbon bonds infrared absorption

Живулин

Песин

Belenkov

et al. 2020

Polymer Degradation and Stability

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“…Irradiation of PVDF with these sources resulted in strong modification of the molecular structure in a near surface layer of the polymer. The chemical changes are associated with dehydrogenation, defluorination [10,12,15,16] and crosslinking between the polymer chains [12,17]. The changes, especially the defluorination, strongly influence the ablation process.…”

Section: Introductionmentioning

confidence: 99%

EUV induced ablation and surface modification of poly(vinylidene fluoride) irradiated in vacuum or gaseous environment

Bartnik¹,

Lisowski²,

Sobczak³

et al. 2013

SPIE Proceedings

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Extreme ultraviolet (EUV) is an ionizing radiation strongly absorbed in any kind of mater. In case of polymers absorption depth is of the order of 100 nm. Interaction of EUV photons with polymer chains results in chain scission and formation of low weight fractions. In this work interaction of intense EUV pulses with poly(vinylidene fluoride) (PVDF) was investigated. Mass spectroscopy was employed to investigate the ablation products indicating emission of numerous molecular species of C-containing fragments of the polymer chain. Chemical surface changes after irradiation were investigated using X-ray photoelectron spectroscopy (XPS). The XPS spectra obtained for PVDF, samples irradiated with low and high EUV fluence, indicate significant differences between chemical structures in near-surface layers. It was shown that irradiation with low fluence results in defluorination and thus carbon enrichment in nearsurface layer. In contrary, irradiation with high fluence leads to intense material ablation and hardly modifies the chemical structure of the remaining material. Additionally chemical modification of the PVDF surface by EUV irradiation in a presence of ionized nitrogen was investigated. The nitrogen gas, injected into an interaction region, was ionized and excited by the EUV radiation from a laser-plasma source. An ionization degree and excited states of nitrogen were investigated using an EUV spectrometry and the corresponding spectra are presented. Chemical modification of the polymer after combined EUV and ionized nitrogen treatment was investigated using an X-ray photoelectron spectroscopy. Significant contribution of the nitrogen atoms in the polymer near-surface layer after the treatment was demonstrated.

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Radiative defluorination of poly (vinylidene fluoride) under soft X-ray radiation

Cited by 13 publications

References 8 publications

A Comparative Study of Gamma-Ray Irradiation-Induced Oxidation: Polyethylene, Poly (Vinylidene Fluoride), and Polytetrafluoroethylene

A Comparative Study of Gamma-Ray Irradiation-Induced Oxidation: Polyethylene, Poly (Vinylidene Fluoride), and Polytetrafluoroethylene

Ageing of chemically modified poly(vinylidene fluoride) film: Evolution of triple carbon-carbon bonds infrared absorption

EUV induced ablation and surface modification of poly(vinylidene fluoride) irradiated in vacuum or gaseous environment

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