Rate effects in the measurement of polymer transitions by differential scanning calorimetry

Strella, Stephen; Erhardt, P. F.

doi:10.1002/app.1969.070130704

Cited by 52 publications

(13 citation statements)

References 3 publications

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“…This "instrumental" effect was entirely removed when the correction fiT was applied and the two curves could be superimposed with no temperature shift. This example illustrates the care which must be taken in analytical treatment of thermal lag using the flow of heat through thin slabs [8]. No allowance can be made for differences in thermal contact between specimen and calorimeter.…”

Section: (C) Transition Temperaturesmentioning

confidence: 99%

Thermal gradients in differential scanning calorimetry

Richardson

Burrington

1974

Journal of Thermal Analysis

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A combined static and dynamic temperature calibration is described. The static calibration corrects the instrumental dial temperature reading. The dynamic calibration has instrumental and material components and therefore varies from specimen to specimen. It is obtained from individual DSC curves and so removes uncertainties in sample temperature due to varying mass, geometry, and heating rate. The instrumental performance is improved and specific heats may be obtained to an accuracy of ~1%. Cp, Tf List of symbols used steady initial and final temperatures, respectively, in a calorimetric experiment; dial temperature reading; true temperature corresponding to To after all corrections have been made; melting point; correction to T D to give Tunder isothermal, 'static' conditions; additional correction to TD, due to thermal lag, to give T under programmed temperature conditions; contributions to 6T originating in the instrument and sample material respectively; total correction to T D to give T under programmed temperature conditions; calorimeter heating rate; enthalpy at T~ and Tf respectively; mean heat capacity over the temperature range T i to T~; heat capacity at Tf. T~,TfDifferential thermal analysis has long been a useful tool in the fields of geology and metallurgy [1]. The recent introduction of commercial apparatus, based on either differential thermal or differential enthalpic methods, has led to many applications far removed from these areas. In particular the technique has proved

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Section: (C) Transition Temperaturesmentioning

confidence: 99%

Thermal gradients in differential scanning calorimetry

Richardson

Burrington

1974

Journal of Thermal Analysis

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“…High cooling rates and the small temperature diffusivity can lead to large temperature differences between surface and centre of the sample [15,16]. High cooling rates and the small temperature diffusivity can lead to large temperature differences between surface and centre of the sample [15,16].…”

Section: Rate Dependence Of Cpmentioning

confidence: 99%

“…During high rates, enormous stationary and non-stationary temperature gradients within the samples [15,16] can exist. During high rates, enormous stationary and non-stationary temperature gradients within the samples [15,16] can exist.…”

Section: Introductionmentioning

confidence: 99%

A reinvestigation of the hypersonic properties and the specific heat capacity of PMMA around the quasi-static glass transition II. High performance caloric investigations

Frühauf

Helwig

Müser

et al. 1988

Colloid & Polymer Sci

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To continue dynamic cp measurements in the range of smallest temperature rates and non-linear thermal relaxation investigations into the linear range, simultaneous ep and thermal relaxation measurements were carried out in an adiabatic vacuum calorimeter, using the pulse heating method. The rate-dependent % behaviour, known from dynamic measurements, does not continue at small temperature rates. This is confirmed by the relaxation process which is observed. The results suggest an extended interpretation of the glass transition in atactic polymethylmethacrylate (PMMA).

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“…It has been observed [20][21][22] that, depending on heating rate, differences as large as 15 °C in polymer transition temperatures may be observed in D.S.C. measurements.…”

Section: Introductionmentioning

confidence: 95%

Structural Integrity Studies in Particulate Composites by Means of Thermal Capacity Measurements

Theocaris

Papanicolaou

Sideridis

1982

Journal of Reinforced Plastics and Composites

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Glass-transition temperatures Tg for iron-epoxy composites were determined from heat-capacity measurements. The effect of several parameters, such as the heating rate, the filler-volume fraction and the particle diameter on Tg was investigated and conclusions concerning the thickness of the boundary interphase were derived. T g -values obtained from TMA-measurements were compared to the respective values obtained from DSC-measurements.

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Rate effects in the measurement of polymer transitions by differential scanning calorimetry

Cited by 52 publications

References 3 publications

Thermal gradients in differential scanning calorimetry

Thermal gradients in differential scanning calorimetry

A reinvestigation of the hypersonic properties and the specific heat capacity of PMMA around the quasi-static glass transition II. High performance caloric investigations

Structural Integrity Studies in Particulate Composites by Means of Thermal Capacity Measurements

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