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Träfflista för sökning "L773:0032 3861 OR L773:1873 2291 srt2:(2000-2004)"

Search: L773:0032 3861 OR L773:1873 2291 > (2000-2004)

  • Result 51-53 of 53
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51.
  • Markusson, Henrik, 1976, et al. (author)
  • IR spectroscopy and quantum mechanical calculations of lithium ion transport conditions in a single ion conducting polymer electrolyte
  • 2004
  • In: Polymer. - : Elsevier BV. - 0032-3861. ; 45:26, s. 9057-9065
  • Journal article (peer-reviewed)abstract
    • Lithium single ion conducting polymers with good conductive properties has the potential of boosting the performance of lithium batteries considerably. Recently, lithium single ion conducting polymer electrolytes were obtained by solvating 'polymeric salts' into polyether matrices. Of the polymeric salts developed, the highest ion conductivity was obtained using poly(5-oxo-3-oxy-4- trifluoromethyl-1,2,4-pentafluoro-pentylene sulphonyl imide lithium) (LiPPI). In the present study ab initio calculations have been used to determine limitations for ion transport in a model system similar to the LiPPI. The lithium ion coordination and the flexibility of the polymer backbone have been studied using monomers and dimers of our model system. Comparisons with calculated IR spectra from our model system and experimental IR spectra of LiPPI in solution show that our model is a good description of the LiPPI system. The present results are used to propose structural changes that may increase the single ion conductivity. © 2004 Elsevier Ltd. All rights reserved.
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52.
  • Rangelov, S, et al. (author)
  • Microgel formation in high molecular weight poly(ethyleneoxide)
  • 2000
  • In: POLYMER. - : ELSEVIER SCI LTD. - 0032-3861. ; 41:13, s. 4825-4830
  • Journal article (peer-reviewed)abstract
    • Light scattering measurements show that, below molecular weights of about 10(6), PEO chains in aqueous solution follow the expected pattern of behavior for a flexible chain in a thermodynamically good solvent, although the coils are unusually extended bec
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53.
  • Winberg, Petra, et al. (author)
  • Nanoscopic properties of silica filled polydimethylsiloxane by means of positron annihilation lifetime spectroscopy
  • 2004
  • In: Polymer. - : Elsevier BV. - 0032-3861. ; 45:24, s. 8253-8264
  • Journal article (peer-reviewed)abstract
    • Positron annihilation lifetime spectroscopy (PALS) was performed on a series of polydimethylsiloxane (PDMS)/fumed silicon dioxide (SiO2) composites at temperatures between -185 and 100degreesC to study the effect of filler content and filler particle size on the free volume properties and the positron annihilation characteristics. The glass transition behavior of the PDMS/SiO2 composites was determined with differential scanning calorimetry. A clear influence on the o-Ps lifetime (73) in the polymer upon addition of nano-sized fumed SiO2 was observed at all temperatures. The observed o-Ps lifetime behavior was related to filler content and filler particle size. A transition in the temperature dependence of the o-Ps lifetime was observed close to -35degreesC above which temperature PDMS exhibits long o-Ps lifetimes. A relationship between tau(3) and the surface tension, equivalent to the behavior of ordinary molecular liquids was observed in this temperature region. The o-Ps yield was strongly reduced in the crystallization region and by addition Of SiO2. The reduction due to filler addition did, however, in the case of nano-sized SiO2 not follow a linear relationship with filler weight, which was observed for micron-sized fillers. The nonlinear relationship between filler weight and o-Ps yield could be due to out-diffusion of positrons and/or o-Ps from the filler particles to the matrix. (C) 2004 Elsevier Ltd. All rights reserved.
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  • Result 51-53 of 53

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