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Statements

Subject Item
n2:RIV%2F00216275%3A25310%2F14%3A39898152%21RIV15-GA0-25310___
rdf:type
skos:Concept n11:Vysledek
dcterms:description
The utilization of the constant ratio cyclic temperature history, where q(+)/q(-) = const., was examined with respect to physical aging studies. In particular, determination of the apparent activation energy of enthalpy relaxation from constant ratio (CR) cycles was discussed. A novel equation fully utilizing the advantages of CR cycles was derived - it is based on shift of temperature corresponding to the maximum of relaxation peak T-p with the applied heating rate: -Delta h(*)/R = din(q(+))/dT(p)(-1). The equation was extensively tested for all types of structural relaxation behavior; it was proven to be highly accurate and independent from most data-distortive effects. In addition, it was shown that the unique shape of CR cycles curves can be utilized for the identification of certain data-distortive effects - thermal lags, imprecise heating/cooling rates or incomplete achievement of a true glassy state during cooling. Correspondingly, corrections for these data-distortive effects can be applied to other physical aging measurements performed for the given glassy material and DSC instrument. The utilization of the constant ratio cyclic temperature history, where q(+)/q(-) = const., was examined with respect to physical aging studies. In particular, determination of the apparent activation energy of enthalpy relaxation from constant ratio (CR) cycles was discussed. A novel equation fully utilizing the advantages of CR cycles was derived - it is based on shift of temperature corresponding to the maximum of relaxation peak T-p with the applied heating rate: -Delta h(*)/R = din(q(+))/dT(p)(-1). The equation was extensively tested for all types of structural relaxation behavior; it was proven to be highly accurate and independent from most data-distortive effects. In addition, it was shown that the unique shape of CR cycles curves can be utilized for the identification of certain data-distortive effects - thermal lags, imprecise heating/cooling rates or incomplete achievement of a true glassy state during cooling. Correspondingly, corrections for these data-distortive effects can be applied to other physical aging measurements performed for the given glassy material and DSC instrument.
dcterms:title
Utilization of %22q(+)/q(-) = const.%22 DSC cycles for physical aging studies Utilization of %22q(+)/q(-) = const.%22 DSC cycles for physical aging studies
skos:prefLabel
Utilization of %22q(+)/q(-) = const.%22 DSC cycles for physical aging studies Utilization of %22q(+)/q(-) = const.%22 DSC cycles for physical aging studies
skos:notation
RIV/00216275:25310/14:39898152!RIV15-GA0-25310___
n3:aktivita
n17:P
n3:aktivity
P(GAP106/11/1152)
n3:cisloPeriodika
October
n3:dodaniDat
n12:2015
n3:domaciTvurceVysledku
n13:1663704
n3:druhVysledku
n18:J
n3:duvernostUdaju
n10:S
n3:entitaPredkladatele
n14:predkladatel
n3:idSjednocenehoVysledku
52633
n3:idVysledku
RIV/00216275:25310/14:39898152
n3:jazykVysledku
n19:eng
n3:klicovaSlova
Enthalpy relaxation; Data-distortive effects; Activation energy; Glass transition
n3:klicoveSlovo
n7:Data-distortive%20effects n7:Enthalpy%20relaxation n7:Activation%20energy n7:Glass%20transition
n3:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n3:kontrolniKodProRIV
[80603C4ACD15]
n3:nazevZdroje
European Polymer Journal
n3:obor
n4:CF
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
1
n3:projekt
n16:GAP106%2F11%2F1152
n3:rokUplatneniVysledku
n12:2014
n3:svazekPeriodika
59
n3:tvurceVysledku
Svoboda, Roman
n3:wos
000343341100021
s:issn
0014-3057
s:numberOfPages
9
n15:doi
10.1016/j.eurpolymj.2014.07.039
n5:organizacniJednotka
25310