Variation of the mesh size of PEO-based networks filled with TFSILi: from an Arrhenius to WLF type conductivity behavior

Carvalho, Luísa; Guégan, Philippe; Cheradame, Hervé; Gomes, Ailton S.

doi:10.1016/s0014-3057(99)00057-9

Cited by 72 publications

(39 citation statements)

References 11 publications

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“…Due to the thermal energy supplied, a small free volume is created around segments. At low temperatures (below T g ), an Arrhenius model was assumed, where the cation transport and its contribution to conductivity is a result of cations jumping into neighboring vacant sites and this jump increases the proton conductivity to a higher value [17,18]. This hopping mechanism between coordinating sites is essentially in the region below T g .…”

Section: Electrical Propertiesmentioning

confidence: 99%

Characterization of C2H2O4 doped PVA solid polymer electrolyte

Alakanandana¹,

Subrahmanyam²,

Sayanna³

et al. 2014

Journal of Polymer Engineering

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A novel solid polymer electrolyte based on poly vinyl alcohol (PVA) with oxalic acid was prepared by the solution caste technique. X-ray diffraction (XRD) and differential scanning calorimetry (DSC) measurements carried out on the samples clearly revealed the modification of the PVA structure; the PVA crystallinity was reduced with increasing oxalic acid content and became more amorphous. The surface morphology of these complexed polymer electrolytes was analyzed by scanning electron microscopy (SEM). Fourier transform infrared spectroscopy (FTIR) spectral studies of the samples suggested that the interaction between H + ions of oxalic acid and oxygen of the hydroxyl group (OH) of PVA plays a major role in proton conductivity. The optical absorption studies were performed on these samples in a range of wave numbers from 200 nm to 600 nm and the optical band gap values were evaluated. Direct current (DC) conductivity was measured and temperature dependence in the range 27-273°C was studied. It was observed that the conductivity at temperatures beyond the glass transition temperature (T g ) showed a Vogel-Tamman-Fulcher (VTF) type behavior. The electrical conductivity studies on PVA with oxalic acid, in a 70:30 proportion by wt%, demonstrated that the polymer composite is a promising electrolyte for applications in electrochemical cells.

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Section: Electrical Propertiesmentioning

confidence: 99%

Characterization of C2H2O4 doped PVA solid polymer electrolyte

Alakanandana¹,

Subrahmanyam²,

Sayanna³

et al. 2014

Journal of Polymer Engineering

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“…This fact that may explain observation in Fig. 5 of rather Arrhenius-like than Vogel Tamman Fulcher-or William Landel Ferry-type behaviors 17 for the ionic conductivities of all these membranes. Obviously, the observed behavior of the conductivity, also for the lithium salt-free S1 and S3 membranes, should favor, as we have well presupposed it, development of an interaction somewhat significant between the DNA macromolecule and the glycerol plasticizer.…”

Section: -4mentioning

confidence: 66%

“…In literature, there is a general agreement that the presence of the plasticizer promotes normally an increase in ionic mobility (associated with the requirement of less energy for ions migration), leading to observation of an enhanced ionic conductivity. 17 To explain it a contribution of the polymer chain movement to ions displacement was proposed. 17 This contribution is related to the free volume of the polymer chain, which should increase when adding the plasticizer.…”

Section: Resultsmentioning

confidence: 99%

“…17 To explain it a contribution of the polymer chain movement to ions displacement was proposed. 17 This contribution is related to the free volume of the polymer chain, which should increase when adding the plasticizer. As the size of this free volume becomes larger, the mobility of the C, for all DNA-based S1 to S5 membranes studied in this work.…”

Section: Resultsmentioning

confidence: 99%

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DNA-based ionic conducting membranes

Firmino¹,

Grote²,

Kajzar³

et al. 2011

Journal of Applied Physics

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Deoxyribonucleic acid based gel solid electrolytes were prepared and their electric properties were characterized. Their ionic conductivity is in the range of 10 À4-10 À5 S/cm at room temperature and increases linearly in function of temperature, obeying an Arrhenius-like relationship. The present study, combined with the literature data, suggests that the electrical conduction mechanism in these membranes involve ion motion and/or charge hopping, promoted most likely by a significant interaction between the membrane components. The good conductivity results, as found here, together with the good transparency and good adhesion to the electrodes show that the DNA-based gel polymer electrolytes are very promising materials for application in various electrochromic devices.

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“…In some cases, a switch from a VTF-type dependence to an Arrhenius one has been observed for a single system, as a function of the TPU composition [45] or the amount of salt present in the electrolyte [34]. The amount of salt in the electrolyte has a significant impact also on the value of the ionic conductivity.…”

Section: Ionic Conductivitymentioning

confidence: 99%