Electrical conductivity of a silicone network upon electron irradiation: influence of formulation

Roggero, Aurélien; Dantras, Éric; Paulmier, Thierry; Tonon, Claire; Lewandowski, Simon; Dagras, Sabine; Payan, D.

doi:10.1088/0022-3727/49/50/505303

Cited by 7 publications

(7 citation statements)

References 34 publications

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“…To carry out the weighing, samples are taken out of the bath, quickly dried with absorbent paper, weighed on a precision balance and then immersed again in acetone. The weight gain (WG) is then calculated by equation (3).…”

Section: Acetone Absorption Testmentioning

confidence: 99%

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Influence of electronic irradiations on the chemical and structural properties of PEEK for space applications

Rival

Paulmier

Dantras

2019

Polymer Degradation and Stability

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Polymer materials used in satellite manufacturing are exposed to severe environmental conditions. Irradiation by high-energy electrons induces chemical modifications of macromolecules. Poly-EtherEtherKetone (PEEK) is used in space industry and therefore, its behaviour regarding electronic irradiations has to be studied. Thus, the aim of this work is to investigate the effect of experimental electronic irradiations on the physical and chemical structure of PEEK. In this way, PEEK films were irradiated under high vacuum by a mono-energetic electron beam. Doses deposited are representatives of 15 years in geostationary electronic environment. The study of irradiated samples revealed modifications of the chemical and physical structures. Irradiation predominantly induces cross-linking phenomena in the amorphous phase in front of chain scission phenomena. Irradiation also leads to a decrease in crystallite size and crystallinity ratio.

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Section: Acetone Absorption Testmentioning

confidence: 99%

“…Moreover, irradiation by high-energy electrons induces modifications of the polymer physico-chemical structure which leads to evolution of its initial properties. These phenomena have already been investigated in several studies like Roggero et al who studied the effect of electronic irradiation on a space-used silicone elastomer [2,3].…”

Section: Introductionmentioning

confidence: 95%

Influence of electronic irradiations on the chemical and structural properties of PEEK for space applications

Rival

Paulmier

Dantras

2019

Polymer Degradation and Stability

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“…In other polymer families, however, charge transport processes are decoupled from the molecular mobility, resulting in an Arrhenius dependence of DC conductivity (e.g. silicones [30] or polyurethane [31] networks). Annealing the sample results in a three decade loss in dc con ductivity compared to the first BDS pass.…”

Section: Charge Transport Processes At Low Frequenciesmentioning

confidence: 99%

Thermal activation of impedance measurements on an epoxy coating for the corrosion protection: 1. Dielectric spectroscopy response in the dry state

Roggero

Caussé

Dantras

et al. 2019

Electrochimica Acta

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OATAO is an open access repository that collects the work of some Toulouse researchers and makes it freely available over the web where possible. This is an author's version published in: https://oatao.univ-toulouse.fr/23151Official URL : https://doi.Thermal activation of impedance measurements on an epoxy coating for the corrosion protection: 1. Dielectric spectroscopy response in the dry state. a b s t r a c tIn this series, an epoxy varnish for the corrosion protection of carbon steel was analyzed in the dry state by broadband dielectric spectroscopy (part 1) to describe the molecular mobility of the epoxy network. Electrochemical impedance spectroscopy measurements were then performed during immersion in a 0.5 M NaCl solution (part 2), with the intent to detect the signature of the molecular mobility in the wet state. The present part 1 focuses on the analysis of the dipolar relaxation times associated with the dielectric manifestation of the glass transition in the dry varnish (a mode). They displayed the charac teristic Vogel Fulcher Tammann dependence on temperature, which is the typical signature of the a mode. The study of the relaxation times showed an anti plasticizing process upon heating the sample, attributed to the outgassing of absorbed ambient humidity and plasticizers from the formulation. When these elements were completely removed, through an annealing step, the epoxy network became sta bilized. The low frequency electrical conductivity of the varnish presented a very similar temperature dependence to the a mode, meaning that the molecular mobility governs the electrical charge transport processes in this system. Absorbed ambient humidity and plasticizers also had a great influence on the electrical conductivity, resulting in three decades higher values compared to the annealed sample without these elements. The strong influence of plasticizers on both the molecular mobility (through plasticization) and the electrical conductivity should be taken into account in view of the barrier properties of the final coating. Part 1 of this series provides a basis for a molecular mobility analysis of the electrochemical impedance measurements performed in part 2.

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“…The irradiation can induce a modification of the physical structure of PDMS, due to that electrical conductivity of a silicone elastomer filled with inorganic fillers decrease upon exposer of electron irradiation. 39 Electrical conductivity is highly dependent on the properties of the conducting fillers, their dispersion, and interfacial interactions with the polymer matrix. A composite of Ag NWs and polyetheretherketone shows lower electrical percolation threshold as compared to the spherical nanoparticles used as fillers.…”

Section: Introductionmentioning

confidence: 99%

Investigating the effect of silver nanorods embedded in polydimethylsiloxane matrix using nanoindentation and its use for flexible electronics

Maithani

Mehta

Singh

2020

J of Applied Polymer Sci

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The stretchable electrodes with excellent flexibility, electrical conductivity, and mechanical durability are the most fundamental components in the emerging and exciting field of flexible electronics. This article proposes a method for fabrication of such a stretchable electrode by embedding silver nanorods (AgNRs) into a polydimethylsiloxane (PDMS) matrix that is grown by a unique glancing angle deposition technique. The surface, mechanical, and electrical properties of PDMS are significantly changed after embedding the AgNRs in it. The results show that surface roughness and polarity increase after AgNRs are embedded in the PDMS matrix. Elastic modulus (E) and hardness (H) decrease with an increase in the indentation load as a result of the indentation depth effect. Due to strong interfacial adhesion of AgNRs embedded in the PDMS matrix, the E and H of nanocomposite are increased by 167.6 and 93.3% compared with PDMS film, respectively. Furthermore, the AgNRs-PDMS film has an electrical resistivity value in the order of 10 −7 Ωm. It remains conductive during various mechanical strains such as bending, twisting, and stretching, which is demonstrated using a light-emitting diode circuit. Simultaneously, the antimicrobial activity of silver could make it a promising candidate for wearable electronics.

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Electrical conductivity of a silicone network upon electron irradiation: influence of formulation

Abstract: OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible.

Cited by 7 publications

References 34 publications

Influence of electronic irradiations on the chemical and structural properties of PEEK for space applications

Influence of electronic irradiations on the chemical and structural properties of PEEK for space applications

Thermal activation of impedance measurements on an epoxy coating for the corrosion protection: 1. Dielectric spectroscopy response in the dry state

Investigating the effect of silver nanorods embedded in polydimethylsiloxane matrix using nanoindentation and its use for flexible electronics

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