Vibrational spectroscopy and structure of polymer electrolytes, poly(ethylene oxide) complexes of alkali metal salts

Papke, B. L.; Ratner, Mark A.; Shriver, Duward F.

doi:10.1016/0022-3697(81)90030-5

Cited by 343 publications

(246 citation statements)

References 25 publications

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“…[17][18][19] In confined PEO (PEO/GO sample), this band moves down to 814 cm -1 as a result of the predominance of trans-transtrans (ttt) geometries. 11,19,20 Therefore, PEO chains within the GO interlayer display a preferential ttt packing in a planar zigzag conformation. This assignment is further corroborated by the red shift and intensity suppression of the spectral feature at 955 cm -1 , corresponding to tgt conformations in the crystal.…”

mentioning

confidence: 99%

Macromolecular Structure and Vibrational Dynamics of Confined Poly(ethylene oxide): From Subnanometer 2D-Intercalation into Graphite Oxide to Surface Adsorption onto Graphene Sheets

et al. 2012

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ABSTRACT:In this work, high-resolution inelastic neutron scattering (INS) has been used to provide novel insights into the properties of confined poly(ethylene oxide) (PEO) chains. Two limits have been explored in detail, namely, single-layer 2D-polymer intercalation into graphite oxide (GO) and surface polymer adsorption onto thermally reduced and exfoliated graphite oxide, i.e., graphene (G) sheets. Careful control over the degree of GO oxidation and exfoliation reveals three distinct cases of spatial confinement: i) subnanometer 2D-confinement; ii) frustrated absorption and iii) surface immobilization. Case i) results in drastic changes to PEO conformational (800-1000 cm -1 ) and collective (200-600 cm -1 ) vibrational modes as a consequence of a preferentially planar zig-zag (trans-trans-trans) chain conformation in the confined polymer phase. These changes give rise to peculiar thermodynamic behavior, whereby confined PEO chains are unable to either crystallize or display a calorimetric glass transition. In case ii), GO is thermally reduced resulting in a disordered pseudo-graphitic structure. As a result, we observe minimal PEO absorption owing to a dramatic reduction in the abundance of hydrophilic groups inside the distorted graphitic galleries. In case iii), the INS data unequivocally show that PEO chains adsorb firmly onto the G sheets, with a substantial increase in the population of gauche conformers. Well-defined glass and melting transitions associated with the confined polymer phase are recovered in case iii), albeit at sensibly lower temperatures than those of the bulk.

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Macromolecular Structure and Vibrational Dynamics of Confined Poly(ethylene oxide): From Subnanometer 2D-Intercalation into Graphite Oxide to Surface Adsorption onto Graphene Sheets

et al. 2012

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“…As the y relaxation is associated with the C-O bond, just this difference may be responsible for the difference in the relaxation spectrum between PEO-KSCN and the other alkali metal thiocyanates. Further, the differences in the relaxation spectrum are probably correlated with the differences in the IR spectra for PEO-NaSCN and PEO-KSCN reported by Papke et al (10).…”

Section: Rmentioning

confidence: 83%

“…Ion conducting poly(ethylene oxide) (PEO) has been attracting a great deal of attention because of possible applications as a solid state electrolyte (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18). As electrical relaxation has proved a useful technique in the study of polymers, such studies of PEO complexed with various thiocyanates were undertaken and the results are presented in the present work.…”

Section: Introductionmentioning

confidence: 99%

Electrical relaxation in pure and alkali metal thiocyanate complexed poly(ethylene oxide)

et al. 1983

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“…(C=O) of PC [18] in liquid electrolytes gets broadened due to its overlapping with the 1793 cm -1 peak of PEO [19], which suggests that PEO chains affect C=O group of PC. In liquid electrolytes, the peaks at 742 and 842 cm -1 have been assigned to free PF 6 -anions.…”

Section: Resultsmentioning

confidence: 99%

Ion Conducting Behaviour of Nano Dispersed Polymer Gel Electrolytes Containing NH4PF6

Sharma¹,

Sekhon²

2007

Port. Electrochim. Acta

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The effect of addition of nano size fumed silica on the conductivity and viscosity behaviour of polymer gel electrolytes containing polyethylene oxide (PEO), ammonium hexafluorophosphate (NH 4 PF 6 ) and propylene carbonate (PC) has been studied. The addition of PEO increases the viscosity of electrolytes alongwith a small increase in conductivity and polymer gel electrolytes with conductivity higher than the corresponding liquid electrolytes have been obtained. Increase in conductivity with the addition of PEO and fumed silica has been explained to be due to the dissociation of ion aggregates, which is also supported by FTIR results. The thermal stability of polymer gel electrolytes improves marginally with the addition of fumed silica. The conductivity of nano dispersed gels does not show much change over 20-100 o C temperature range and also remains constant with time.

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Vibrational spectroscopy and structure of polymer electrolytes, poly(ethylene oxide) complexes of alkali metal salts

Cited by 343 publications

References 25 publications

Macromolecular Structure and Vibrational Dynamics of Confined Poly(ethylene oxide): From Subnanometer 2D-Intercalation into Graphite Oxide to Surface Adsorption onto Graphene Sheets

Macromolecular Structure and Vibrational Dynamics of Confined Poly(ethylene oxide): From Subnanometer 2D-Intercalation into Graphite Oxide to Surface Adsorption onto Graphene Sheets

Electrical relaxation in pure and alkali metal thiocyanate complexed poly(ethylene oxide)

Ion Conducting Behaviour of Nano Dispersed Polymer Gel Electrolytes Containing NH4PF6

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