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Statements

Subject Item
n2:RIV%2F70883521%3A28110%2F06%3A63504459%21RIV07-MSM-28110___
rdf:type
skos:Concept n19:Vysledek
dcterms:description
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. 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.
dcterms: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 Electrical Conductivity Response to Structural Relaxation of a-PMMA Filled with Carbon Black and Carbon Nanotubes
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 Electrical Conductivity Response to Structural Relaxation of a-PMMA Filled with Carbon Black and Carbon Nanotubes
skos:notation
RIV/70883521:28110/06:63504459!RIV07-MSM-28110___
n3:strany
1-1
n3:aktivita
n16:P n16:Z
n3:aktivity
P(GP106/06/P189), Z(MSM7088352101)
n3:dodaniDat
n7:2007
n3:domaciTvurceVysledku
n6:1535714 n6:7272197 n6:5474353
n3:druhVysledku
n12:D
n3:duvernostUdaju
n21:S
n3:entitaPredkladatele
n5:predkladatel
n3:idSjednocenehoVysledku
473730
n3:idVysledku
RIV/70883521:28110/06:63504459
n3:jazykVysledku
n10:eng
n3:klicovaSlova
Carbon Nanotubes; MWNT; Polymer Composites; percolation threshold
n3:klicoveSlovo
n15:Carbon%20Nanotubes n15:Polymer%20Composites n15:MWNT n15:percolation%20threshold
n3:kontrolniKodProRIV
[995F3CBCAEF3]
n3:mistoVydani
Akron
n3:nazevZdroje
Polymer Processing Society 22nd Annual Meeting PPS
n3:obor
n20:JJ
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
3
n3:projekt
n8:GP106%2F06%2FP189
n3:rokUplatneniVysledku
n7:2006
n3:tvurceVysledku
Hadač, Jiří Sáha, Petr Slobodián, Petr
n3:zamer
n4:MSM7088352101
s:numberOfPages
1
n17:hasPublisher
Polymer Processing Society
n11:isbn
4-9093109-2-6
n13:organizacniJednotka
28110