. "473730" . . "Hada\u010D, Ji\u0159\u00ED" . . "P(GP106/06/P189), Z(MSM7088352101)" . "1-1" . . "[995F3CBCAEF3]" . . "RIV/70883521:28110/06:63504459" . . . "Electrical Conductivity Response to Structural Relaxation of a-PMMA Filled with Carbon Black and Carbon Nanotubes"@en . "S\u00E1ha, Petr" . "Odezva v elektrick\u00E9 vodivosti na strukturn\u00ED relaxaci PMMA pln\u011Bn\u00E9ho uhl\u00EDkov\u00FDmi nanotrubicemi"@cs . . "4-9093109-2-6" . "Slobodi\u00E1n, Petr" . "3"^^ . . . "3"^^ . . "28110" . "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 . "Electrical Conductivity Response to Structural Relaxation of a-PMMA Filled with Carbon Black and Carbon Nanotubes" . "RIV/70883521:28110/06:63504459!RIV07-MSM-28110___" . "Electrical Conductivity Response to Structural Relaxation of a-PMMA Filled with Carbon Black and Carbon Nanotubes" . "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." . "Polymer Processing Society 22nd Annual Meeting PPS" . "Akron" . "Carbon Nanotubes; MWNT; Polymer Composites; percolation threshold"@en . . . . . "Polymer Processing Society" . . . "1"^^ . . "Odezva v elektrick\u00E9 vodivosti na strukturn\u00ED relaxaci PMMA pln\u011Bn\u00E9ho uhl\u00EDkov\u00FDmi nanotrubicemi"@cs . "Electrical Conductivity Response to Structural Relaxation of a-PMMA Filled with Carbon Black and Carbon Nanotubes"@en . . "Strukturn\u00ED relaxace je zkoum\u00E1na pomoc\u00ED entalpick\u00FDch \u010Di objemov\u00FDch dat. Je mo\u017En\u00E9 prov\u00E9st i jist\u00E1 relaxa\u010Dn\u00ED m\u011B\u0159en\u00ED pomoc\u00ED m\u011B\u0159en\u00ED vodivosti kompozitu na b\u00E1zi PMMA/CB \u010Di PMMA/uhl\u00EDkov\u00E1 nanotrubice. Perkola\u010Dn\u00ED pr\u00E1h byl nalezen kolem 5 wt. % a vodivost roste s koncentrac\u00ED plniva. Vytvo\u0159en\u00E9 vodivostn\u00ED cesty jsou ovliv\u0148ov\u00E1ny zm\u011Bnou objemu vzorku vyvolan\u00E9 zm\u011Bnou teploty i relaxa\u010Dn\u00EDmi zm\u011Bnami. Tyto struktury jsou velmi citliv\u00E9 na tyto zm\u011Bny."@cs . .