About: Electrical Conductivity Response to Structural Relaxation of a-PMMA Filled with Carbon Black and Carbon Nanotubes     Goto   Sponge   NotDistinct   Permalink

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  • The phenomenon of structural relaxation is mainly investigated by enthalpy or volume isothermal measurements. It is possible to significantly change conductivity of polymers by its blending with conducting filer. In the case of composite based as PMMA/carbon black, CB, percolation threshold is found somewhere around concentration 5 vol. % of CB on carbon nanotubes, when conductivity increases over nine orders comparing to pure PMMA. This fact is usually explained by creating of conductive paths by carbon black particles in insulator polymer matrix. This structure is very sensitive to volume changes implicated creating or destroying of conductivity paths, with strong dispersion in glass transition region. According this, the measurement of electrical conductivity is capable to detect sample changes caused either by thermal expansion but also by isothermal structural relaxation of the material.
  • The phenomenon of structural relaxation is mainly investigated by enthalpy or volume isothermal measurements. It is possible to significantly change conductivity of polymers by its blending with conducting filer. In the case of composite based as PMMA/carbon black, CB, percolation threshold is found somewhere around concentration 5 vol. % of CB on carbon nanotubes, when conductivity increases over nine orders comparing to pure PMMA. This fact is usually explained by creating of conductive paths by carbon black particles in insulator polymer matrix. This structure is very sensitive to volume changes implicated creating or destroying of conductivity paths, with strong dispersion in glass transition region. According this, the measurement of electrical conductivity is capable to detect sample changes caused either by thermal expansion but also by isothermal structural relaxation of the material. (en)
  • Strukturní relaxace je zkoumána pomocí entalpických či objemových dat. Je možné provést i jistá relaxační měření pomocí měření vodivosti kompozitu na bázi PMMA/CB či PMMA/uhlíková nanotrubice. Perkolační práh byl nalezen kolem 5 wt. % a vodivost roste s koncentrací plniva. Vytvořené vodivostní cesty jsou ovlivňovány změnou objemu vzorku vyvolané změnou teploty i relaxačními změnami. Tyto struktury jsou velmi citlivé na tyto změny. (cs)
Title
  • Electrical Conductivity Response to Structural Relaxation of a-PMMA Filled with Carbon Black and Carbon Nanotubes
  • Odezva v elektrické vodivosti na strukturní relaxaci PMMA plněného uhlíkovými nanotrubicemi (cs)
  • Electrical Conductivity Response to Structural Relaxation of a-PMMA Filled with Carbon Black and Carbon Nanotubes (en)
skos:prefLabel
  • Electrical Conductivity Response to Structural Relaxation of a-PMMA Filled with Carbon Black and Carbon Nanotubes
  • Odezva v elektrické vodivosti na strukturní relaxaci PMMA plněného uhlíkovými nanotrubicemi (cs)
  • Electrical Conductivity Response to Structural Relaxation of a-PMMA Filled with Carbon Black and Carbon Nanotubes (en)
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  • RIV/70883521:28110/06:63504459!RIV07-MSM-28110___
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  • P(GP106/06/P189), Z(MSM7088352101)
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  • Carbon Nanotubes; MWNT; Polymer Composites; percolation threshold (en)
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  • [995F3CBCAEF3]
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  • Polymer Processing Society 22nd Annual Meeting PPS
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  • Sáha, Petr
  • Slobodián, Petr
  • Hadač, Jiří
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  • Polymer Processing Society
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  • 4-9093109-2-6
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  • 28110
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