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Electrophysical behavior of ion-conductive organic-inorganic polymer system based on aliphatic epoxy resin and salt of lithium perchlorate.

Matkovska L, Iurzhenko M, Mamunya Y, Matkovska O, Demchenko V, Lebedev E, Boiteux G, Serghei A - Nanoscale Res Lett (2014)

Bottom Line: The effect of LiClO4 content on the electrophysical properties of epoxy polymers has been studied by differential scanning calorimetry (DSC) and broadband dielectric spectroscopy (BDS).The effect of LiClO4 content on the structure has been studied by wide-angle X-ray scattering (WAXS).The presence of ether oxygen in DEG macromolecules provides a transfer mechanism of the lithium cations with the ether oxygen similar to polyethylene oxide (PEO).

View Article: PubMed Central - PubMed

Affiliation: Institute of Macromolecular Chemistry of National Academy of Sciences of Ukraine, Kyiv, 02160, Ukraine, LOVEMK@ukr.net.

ABSTRACT

Unlabelled: In the present work, ion-conductive hybrid organic-inorganic polymers based on epoxy oligomer of diglycide aliphatic ester of polyethylene glycol (DEG) and lithium perchlorate (LiClO4) were synthesized. The effect of LiClO4 content on the electrophysical properties of epoxy polymers has been studied by differential scanning calorimetry (DSC) and broadband dielectric spectroscopy (BDS). The effect of LiClO4 content on the structure has been studied by wide-angle X-ray scattering (WAXS). It was found that LiClO4 impacts on the structure of the synthesized hybrid epoxy polymers, probably, by formation of coordinative complexes {ether oxygen-lithium cations-ether oxygen} as evidenced from a significant increase in their glass transition temperatures with increasing LiClO4 concentration and WAXS studies. The presence of ether oxygen in DEG macromolecules provides a transfer mechanism of the lithium cations with the ether oxygen similar to polyethylene oxide (PEO). Thus, the obtained hybrid polymers have high values of ionic conductivity σ' (approximately 10(-3) S/cm) and permittivity ϵ' (6 × 10(5)) at elevated temperatures (200°С). On the other hand, DEG has higher heat resistance compared to PEO that makes these systems perspective as solid polymer electrolytes able to operate at high temperature.

Pacs: 81.07.Pr; 62.23.St; 66.30.hk.

No MeSH data available.


Related in: MedlinePlus

Z″/Z′ plots for the DEG/LiClO4systems.Z″/Z′ plots for epoxy system with 5 phr of LiClO4 in the temperature range from −60°C to +200°C in double logarithmic coordinates (a) and in Cole-Cole coordinates at 30°C (b).
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Fig5: Z″/Z′ plots for the DEG/LiClO4systems.Z″/Z′ plots for epoxy system with 5 phr of LiClO4 in the temperature range from −60°C to +200°C in double logarithmic coordinates (a) and in Cole-Cole coordinates at 30°C (b).

Mentions: The frequency dependences of the impedance of the systems studied on temperature were also analyzed. Figure 5a shows the isothermal spectra of Z" = f(Z′), where Z′ = M″/(ω · C0) is the real part of the complex impedance, Z″ = M′/(ω · C0) is the imaginary part of the complex impedance, М′ and М″ are the real and the imaginary parts of electrical modulus, C0 is the cell capacitance without the sample in vacuum, in double logarithmic coordinates for the DEG system containing 5 phr LiClO4 in the temperature range from −60°C to +200°C. It is evident that the nature of the isotherms at temperatures below the glass transition temperature Tg corresponds to the character of the open Warburg diffusion impedance (direct linear relationship) that describes a semi-infinite diffusion process and due to the ‘frosting process’ of charge transfer in such systems. The bulk resistance of the systems is represented by minimums on isotherms, which appears when the temperature passes the glass transition temperature of the systems. The curves acquire the form of a finite (closed) Warburg diffusion impedance that describes the linear diffusion process in a homogeneous layer of finite thickness, i.e., the charge transfer through the bulk of the systems becomes ‘unfrozen’ [30].Figure 5


Electrophysical behavior of ion-conductive organic-inorganic polymer system based on aliphatic epoxy resin and salt of lithium perchlorate.

Matkovska L, Iurzhenko M, Mamunya Y, Matkovska O, Demchenko V, Lebedev E, Boiteux G, Serghei A - Nanoscale Res Lett (2014)

Z″/Z′ plots for the DEG/LiClO4systems.Z″/Z′ plots for epoxy system with 5 phr of LiClO4 in the temperature range from −60°C to +200°C in double logarithmic coordinates (a) and in Cole-Cole coordinates at 30°C (b).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4493850&req=5

Fig5: Z″/Z′ plots for the DEG/LiClO4systems.Z″/Z′ plots for epoxy system with 5 phr of LiClO4 in the temperature range from −60°C to +200°C in double logarithmic coordinates (a) and in Cole-Cole coordinates at 30°C (b).
Mentions: The frequency dependences of the impedance of the systems studied on temperature were also analyzed. Figure 5a shows the isothermal spectra of Z" = f(Z′), where Z′ = M″/(ω · C0) is the real part of the complex impedance, Z″ = M′/(ω · C0) is the imaginary part of the complex impedance, М′ and М″ are the real and the imaginary parts of electrical modulus, C0 is the cell capacitance without the sample in vacuum, in double logarithmic coordinates for the DEG system containing 5 phr LiClO4 in the temperature range from −60°C to +200°C. It is evident that the nature of the isotherms at temperatures below the glass transition temperature Tg corresponds to the character of the open Warburg diffusion impedance (direct linear relationship) that describes a semi-infinite diffusion process and due to the ‘frosting process’ of charge transfer in such systems. The bulk resistance of the systems is represented by minimums on isotherms, which appears when the temperature passes the glass transition temperature of the systems. The curves acquire the form of a finite (closed) Warburg diffusion impedance that describes the linear diffusion process in a homogeneous layer of finite thickness, i.e., the charge transfer through the bulk of the systems becomes ‘unfrozen’ [30].Figure 5

Bottom Line: The effect of LiClO4 content on the electrophysical properties of epoxy polymers has been studied by differential scanning calorimetry (DSC) and broadband dielectric spectroscopy (BDS).The effect of LiClO4 content on the structure has been studied by wide-angle X-ray scattering (WAXS).The presence of ether oxygen in DEG macromolecules provides a transfer mechanism of the lithium cations with the ether oxygen similar to polyethylene oxide (PEO).

View Article: PubMed Central - PubMed

Affiliation: Institute of Macromolecular Chemistry of National Academy of Sciences of Ukraine, Kyiv, 02160, Ukraine, LOVEMK@ukr.net.

ABSTRACT

Unlabelled: In the present work, ion-conductive hybrid organic-inorganic polymers based on epoxy oligomer of diglycide aliphatic ester of polyethylene glycol (DEG) and lithium perchlorate (LiClO4) were synthesized. The effect of LiClO4 content on the electrophysical properties of epoxy polymers has been studied by differential scanning calorimetry (DSC) and broadband dielectric spectroscopy (BDS). The effect of LiClO4 content on the structure has been studied by wide-angle X-ray scattering (WAXS). It was found that LiClO4 impacts on the structure of the synthesized hybrid epoxy polymers, probably, by formation of coordinative complexes {ether oxygen-lithium cations-ether oxygen} as evidenced from a significant increase in their glass transition temperatures with increasing LiClO4 concentration and WAXS studies. The presence of ether oxygen in DEG macromolecules provides a transfer mechanism of the lithium cations with the ether oxygen similar to polyethylene oxide (PEO). Thus, the obtained hybrid polymers have high values of ionic conductivity σ' (approximately 10(-3) S/cm) and permittivity ϵ' (6 × 10(5)) at elevated temperatures (200°С). On the other hand, DEG has higher heat resistance compared to PEO that makes these systems perspective as solid polymer electrolytes able to operate at high temperature.

Pacs: 81.07.Pr; 62.23.St; 66.30.hk.

No MeSH data available.


Related in: MedlinePlus