Publication detail

Utilization of "q(+)/q(-) = const." DSC cycles for physical aging studies

Authors: Svoboda Roman

Year: 2014

Type of publication: článek v odborném periodiku

Name of source: European Polymer Journal

Publisher name: Pergamon-Elsevier Science Ltd.

Place: Oxford

Page from-to: 180-188

Titles:

Language	Name	Abstract	Keywords
cze	Využití DSC cyklů typu "q(+)/q(-) = konst." pro studie fyzikálního stárnutí	Využití cyklů využívajících stejnou rychlost chlazení a ohřevu ke studiu fyzikálního stárnutí amorfních materiálů byla testována pomocí simulace.	skelný přechod; aktivační energie; entalpická relaxace
eng	Utilization of "q(+)/q(-) = const." DSC cycles for physical aging studies	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.	Glass transition; Activation energy; Data-distortive effects; Enthalpy relaxation

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