Electrically Conducting Poly(Vinyl Acetate)

Wintersgill, M. C.; Fontanella, J. J.; Calame, J.P.; Greenbaum, Steve; Andeen, Carl

doi:10.1149/1.2116054

Cited by 12 publications

(3 citation statements)

References 4 publications

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“…[3] decreases as temperature increases. This agrees with previous observations in PEO (12,13). Further, this is expected since in general activation volumes scale with activation energy and, as is apparent from Fig.…”

Section: Electrical Conductivity--thesupporting

confidence: 93%

NMR, DSC, DMA, and High Pressure Electrical Conductivity Studies in PPO Complexed with Sodium Perchlorate

Greenbaum

Pak

Wintersgill

et al. 1988

J. Electrochem. Soc.

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Audio frequency electrical conductivity, DSC, DMA, and 23Na NMR measurements have been carried out on Parel 58 elastomer complexed with sodium perchlorate. [As Parel 58 is primarily po]y(propylene oxide), itwill be referred to as PPO.] The DSC and DMA measurements yield similar values for T~ which are about 72~ higher than the "central" T~ for uncomplexed PPO. In addition, the DSC studies show that the sodium perchlorate is insoluble above about 140~ The conductivity measurements have been carried out in vacuum over the temperature range 290-380 K and at pressures up to 0.65 GPa from 315-370 K. From a VTF analysis Ea is found to be about 0.09 eV, and To is found to be about 45~ below the "central" glass transition temperature which is the same behavior observed previously for PPO complexed with lithium salts and for the ~ relaxation in uncomplexed material. In addition, it is found that the vacuum activation volumes for the electrical conductivity and the a relaxation are approximately the same when compared relative to To. The 23Na NMR measurements reveal the presence of both bound and mobile sodium species, where the bound species constitutes only about 20% of the total sodium at temperatures below %, and is no longer observable above about 80~ In addition the mobile 23Na resonance becomes motionally narrowed above T~. The NMR results combined with conductivity data imply that ion motion is controlled by large scale segmental motions of the polymer chains.In recent papers, results for the temperature and pressure variation of electrical conductivity in PPO complexed with lithium salts along with the temperature and pressure variation of the a relaxation have been presented (1, 2). The most important result of that work is that it was shown that to within experimental uncertainty, the temperature and pressure variation of the electrical conductivity was found to be the same as the temperatfire and pressure variation of the electrical relaxation time for the ~ relaxation. This provides quantitative evidence that, for PPO, ionic conductivity is controlled by large-scale segmental motions [conformational rearrangements of the polymer chain backbone (3)] characteristic of the glass-rubber transition. "Such rearrangements occur by a mechanism of hindered rotation around main chain bonds and involve cooperative thermal motions of individual chain segments. The hindrance to these "miero-Brownian" motions can be described in terms of viscous or frictional forces which result from interactions of the moving segment with neighboring molecules or with segments within the same chain (3)." However, in the earlier paper (2), it was emphasized that the conductivity results alone could not be used to elucidate the transport mechanism as the shift in carrier concentration with temperature was unknown. In the present paper both electrical conductivity and nuclear magnetic resonance (NMR) measurements are * Electrochemical Society Active Member.carried out on PPO complexed with sodium perchlorate. The combination of the r...

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Section: Electrical Conductivity--thesupporting

confidence: 93%

NMR, DSC, DMA, and High Pressure Electrical Conductivity Studies in PPO Complexed with Sodium Perchlorate

Greenbaum

Pak

Wintersgill

et al. 1988

J. Electrochem. Soc.

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“…The conductivity of pure PVA at room temperature has been reported to be between 10 −9 to 10 −10 S cm −1 [16,17], and the PVA parent, polyvinyl acetate (PVAc) has a lower conductivity of about 10 −12 S cm −1 [18]. The value measured in the present work, (3.0±1.1)×10 −11 S cm −1 is, therefore, in reasonable agreement with that reported in the literature.…”

Section: Resultsmentioning

confidence: 99%

Effect of storage time on the properties of PVA–KOH alkaline solid polymer electrolyte system

Mohamad

Arof

2006

Ionics

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Polyvinyl alcohol (PVA) and potassium hydroxide (KOH) have been used to prepare alkaline solid polymer electrolytes (ASPE) films. The films were stored in a dry environment for 30 and 100 days. The highest room temperature conductivity for the PVA:KOH film with weight percentage ratio of 1:0.67 during storage for 30 and 100 days were (8.5±0.2)×10 −4 and (1.3±0.1)×10 −7 S cm −1 , respectively. The conductivity-temperature behaviour after 30 and 100 days of storage of the alkaline polymer electrolytes is Arrhenian and liquid-like. The structural, morphological and thermal studies of the ASPE films are also presented in this paper.

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“…Previous nuclear magnetic resonance (NMR) studies of lithium-salt association complexes with PEO (11) and related polymers (12,13) demonstrate a feature common to superionic solids -motional narrowing of 7Li NMR lines in the temperature region of enhanced conductivity. As will be discussed, similar results are obtained for SNa in the present study.…”

mentioning

confidence: 99%

Ion and polymer chain motion in a superionic sodium-poly (ethylene oxide) complex

Greenbaum¹

1985

Solid State Ionics

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Electrically Conducting Poly(Vinyl Acetate)

Abstract: not Available.

Cited by 12 publications

References 4 publications

NMR, DSC, DMA, and High Pressure Electrical Conductivity Studies in PPO Complexed with Sodium Perchlorate

NMR, DSC, DMA, and High Pressure Electrical Conductivity Studies in PPO Complexed with Sodium Perchlorate

Effect of storage time on the properties of PVA–KOH alkaline solid polymer electrolyte system

Ion and polymer chain motion in a superionic sodium-poly (ethylene oxide) complex

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