Fully automated dynamic calorimeter

Jung, Dae-Sung; Kwon, Tae-Dong; Bae, Dalmin; Moon, Il; Jeong, Yoon Hee

doi:10.1088/0957-0233/3/5/007

Cited by 45 publications

(31 citation statements)

References 11 publications

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“…The general theoretical framework for the linear response was given by Kubo [8] in the case of relaxation processes. As shown by different authors, the specific heat capacity can also be described as a compliance in the linear response approach [9][10][11]. In general, heat capacity is a time or frequency dependent quantity.…”

Section: John Wiley and Sons Limitedmentioning

confidence: 99%

Temperature modulated calorimetry and dielectric spectroscopy in the glass transition region of polymers

Hensel

Dobbertin

Schawe

et al. 1996

Journal of Thermal Analysis

122

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The results from temperature modulated DSC in the glass transition region of amorphous and semicrystalline polymers are described with the linear response approach. The real and the imaginary part of the eomplex heat capacity are discussed. The findings are compared with those of dielectric spectroscopy. The frequency dependent glass transition temperature can be fitted with a VFT-equation. The transition frequencies are decreased by 0.5 to 1 orders of magnitude compared to dielectric measurements. Cooling rates from standard DSC are transformed into frequencies. The glass transition temperatures are also approximated by the VFT-fit from the temperature modulated measurements. The differences in the shape of the curves from amorphous and semicrystalline samples are discussed.

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Section: John Wiley and Sons Limitedmentioning

confidence: 99%

Temperature modulated calorimetry and dielectric spectroscopy in the glass transition region of polymers

Hensel

Dobbertin

Schawe

et al. 1996

Journal of Thermal Analysis

122

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“…Consequently, this situation can be dealt with using the simple energy balance problem [21] (see Eq. 5).…”

Section: Resultsmentioning

confidence: 99%

Study of a Thermophysical System with Two Time Constants Using an Open Photoacoustic Cell

Bonno¹,

Zéninari²,

Joly³

et al. 2011

Int J Thermophys

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In this paper a study of a thermophysical system with two time constants, an electronic time constant and a thermal relaxation time constant, is presented. The system under study is a thin metallic sample coupled to an open photoacoustic (PA) cell, the resulting signal being measured by a lock-in amplifier or by a data acquisition device. All operations are performed by a computer-based automatic measurement system. A time-and frequency-domain theoretical analysis of the photothermal signal is given combining the usual PA scheme to the energy balance equation of the system. The experimental results are in very good agreement with the developed theory.

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“…At the same time, frequency dependent complex heat capacity was also envisaged by Christensen [15]. Specific heat spectroscopy with the 3ω-method was also tackled in the following references [16][17][18][19]. An other original approach is due to Toda and co-workers, who derived the complex heat capacity directly through a pure kinetic approach during melting of polymer crystals [20,21].…”

Section: Historical Background Of Frequency Dependent Complex Heat Camentioning

confidence: 99%

“…If ξ < ξ eq , then the affinity is positive, and if ξ > ξ eq , then the affinity is negative. If the affinity is positive then the rate of reaction is positive because of the fundamental inequality of De Donder (16). Thus, the degree of advance of the transformation increases.…”

Section: Total Differential Of the Affinity Close To Equilibriummentioning

confidence: 99%