Theoretical Analysis of the Radiation-Induced Conductivity in Polymers Exposed to Pulsed and Continuous Electron Beams

Tyutnev, A. P.; Saenko, V. S.; Zhadov, Aleksey D.; Abrameshin, D. A.

doi:10.3390/polym12030628

Cited by 4 publications

(3 citation statements)

References 24 publications

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“…Indeed [63], stabilization and accumulation of significant concentrations of ions and ion-radicals should be expected upon low-temperature irradiation of PTFE. Nevertheless, the detection of radiation-induced hole conductivity of PTFE irradiated at room and elevated temperatures suggests that a certain steady-state concentration of "parent" cations can be established in the PTFE melt during high-temperature irradiation [72,73]. These cations can react with macromolecules and form crosslinks [74].…”

Section: Discussionmentioning

confidence: 99%

Structure of Polytetrafluoroethylene Modified by the Combined Action of γ-Radiation and High Temperatures

et al. 2021

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By means of X-ray computed microtomography (XCMT), the existence of a developed porous structure with an average pore diameter of ~3.5 μm and pore content of ~1.1 vol.% has been revealed in unirradiated polytetrafluoroethylene (PTFE). It has been found that the combined action of gamma radiation (absorbed dose per PTFE of ~170 kGy) and high temperatures (327–350 °C) leads to the disappearance of the porous structure and the formation of several large pores with sizes from 30 to 50 μm in the bulk of thermal-radiation modified PTFE (TRM-PTFE). It has been established by X-ray diffraction (XRD) analysis that the thermal-radiation modification of PTFE leads to an increase in the interplanar spacings, the degree of crystallinity and the volume of the unit cell, as well as to a decrease in the size of crystals and the X-ray density of the crystalline phase in comparison with the initial polymer. It is assumed that the previously-established effect of improving the deformation-strength and tribological properties of the TRM-PTFE can be due not only to the radiation cross-linking of polymer chains but also to the disappearance of the pore system and to the ordering of the crystalline phase of PTFE

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Section: Discussionmentioning

confidence: 99%

Structure of Polytetrafluoroethylene Modified by the Combined Action of γ-Radiation and High Temperatures

et al. 2021

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“…A variety of techniques is used to change structural, physical and chemical properties of polymers: heat and laser light treatment, doping, ion beam mixing as well as irradiations with electron, ion, neutron or gamma ray beams [4][5][6][7][8][9]. Ion implantation is one of the most popular methods allowing tranformation of the thin upper layer of the synthetic material and change its often unpredictable electrical properties [10] making these these materials (usually characterised by very high resistance) much more applicable in electronic industry.…”

Section: Introductionmentioning

confidence: 99%

Modification of Optical, Electronic and Microstructural Properties of PET by 150 keV Cs+ Irradiation

Musiatowicz¹,

Turek²,

Droździel³

et al. 2022

Adv. Sci. Technol. Res. J.

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Thick (0.125 mm) sheet samples of PET were irradiated with 150 keV Cs + ion beam with fluences in the range from 10 13 cm -2 up to 10 16 cm -2 ). Raman and UV-VIS spectroscopy measurements shown destruction of numerous bonds within the polymer -this effect intensifies with fluence. Raman spectroscopy shows the presence of amorphous graphitelike structures as the broad G band appears in the collected spectrum. The analysis of absorbance spectra also confirms formation of numerous carbon clusters leading to a formation of vast conducting structures in the modified layer of the polymer. One can observe the decrease of optical bandgap from 3.85 eV (typical for pristine PET) to 1.05 eV for the sample implanted with the highest fluence, the effect is weaker than for lighter alkali metal ions. The estimated average number of C atom in a clusters reaches in such case values close to 1100. The changes in the polymer structure lead to intense reduction of electrical sheet resistivity of the modified samples by ~ 8 orders of magnitude in the case of severely modified sample. The dependence of resistivity on temperature has also been measured. The plots of ln(σ) vs 1/T show that band conductivity or nearest neighbor hopping between conducting structures prevail in the considered case

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“…It should be mentioned here that not only classical ion implantation is employed for polymer modification, but plasma immersion [18][19][20] and laser-based techniques [21] are also becoming more and more common in this field. Other popular techniques that allow efficient treatment and modification of polymers are electron beams or gamma ray irradiations [22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Modification of PET Foil by 150 keV Li⁺ Ion Implantation

et al. 2022

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Very thin (3 µm in thickness) polyethylene terephthalate polymer foils were implanted with 150 keV Li + with fluences in the range from 1×10 14 cm −2 up to 2×10 16 cm −2 . Modification of the irradiated polymer microstructure was studied with the Fourier transform infrared spectroscopy and Raman spectroscopy. Breaking of a variety of chemical bonds followed by the formation of carbon clusters made of sp 2 C was proved. The dominance of the rings in the carbonized, graphite-like subsurface layer is demonstrated based on the fact that the G band prevails in the Raman spectra for larger Li + fluences. The rise of the absorbance within 200-800 nm is observed. Tauc's plots analysis enables the estimation of optical bandgap values that decrease from 3.95 eV (pristine polyethylene terephthalate) down to 1.4 eV (fluence of 2 × 10 16 cm −2 ). This change is not as dramatic as in the case of heavier projectiles like K + or Na + . Reduction of surface resistivity by more than 2 orders of magnitude is observed in the case of the sample irradiated with the fluence 1 × 10 16 cm −2 , and this effect is much smaller than that induced by the heavier projectile bombardment with the same fluence. topics: polymers modification, ion implantation, polyethylene terephthalate (PET)

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Theoretical Analysis of the Radiation-Induced Conductivity in Polymers Exposed to Pulsed and Continuous Electron Beams

Cited by 4 publications

References 24 publications

Structure of Polytetrafluoroethylene Modified by the Combined Action of γ-Radiation and High Temperatures

Structure of Polytetrafluoroethylene Modified by the Combined Action of γ-Radiation and High Temperatures

Modification of Optical, Electronic and Microstructural Properties of PET by 150 keV Cs+ Irradiation

Modification of PET Foil by 150 keV Li⁺ Ion Implantation

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Theoretical Analysis of the Radiation-Induced Conductivity in Polymers Exposed to Pulsed and Continuous Electron Beams

Cited by 4 publications

References 24 publications

Structure of Polytetrafluoroethylene Modified by the Combined Action of γ-Radiation and High Temperatures

Structure of Polytetrafluoroethylene Modified by the Combined Action of γ-Radiation and High Temperatures

Modification of Optical, Electronic and Microstructural Properties of PET by 150 keV Cs+ Irradiation

Modification of PET Foil by 150 keV Li+ Ion Implantation

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Product

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Modification of PET Foil by 150 keV Li⁺ Ion Implantation