Historical Roots and Development of Thermal Analysis and Calorimetry

Šesták, Jaroslav; Hubík, P.; Mareš, Jiřı́ J.

doi:10.1007/978-90-481-2882-2_21

Cited by 20 publications

(10 citation statements)

References 78 publications

(82 reference statements)

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“…Heat is transported by a wave mechanism in crystalline materials, i.e., when heat influences a crystalline material surface then the atoms acquire vibrational energy and propagate this energy towards the adjacent atoms and thus heat is transported in a regular way to the whole crystalline material and finally heat is emitted to the environment. This is how the thermal conductivity mechanism works in crystalline materials [ 35 , 36 , 37 ]. Amorphous polymers are different compared to crystalline polymers, as they are composed of disconnected atoms having no specific patterns or arrangement thus the conduction of heat through such material varies in different situations.…”

Section: Thermal Transport Mechanismsmentioning

confidence: 99%

“…Amorphous polymers are different compared to crystalline polymers, as they are composed of disconnected atoms having no specific patterns or arrangement thus the conduction of heat through such material varies in different situations. Due to the disordered atoms the heat is not dispersed resembling a wave, as the vibrational energy of atoms is also disrupted thus the speed of heat spread is also affected [ 37 , 38 , 39 , 40 ]. The mechanism of thermal conductivity in CF composites is shown in Figure 2 .…”

Section: Thermal Transport Mechanismsmentioning

confidence: 99%

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Preparation, Properties and Mechanisms of Carbon Fiber/Polymer Composites for Thermal Management Applications

et al. 2021

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With the increasing integration and miniaturization of electronic devices, heat dissipation has become a major challenge. The traditional printed polymer circuit board can no longer meet the heat dissipation demands of microelectronic equipment. If the heat cannot be removed quickly and effectively, the efficiency of the devices will be decreased and their lifetime will be shortened. In addition, the development of the aerospace, automobiles, light emitting diode (LED{ TA \1 “LED; lightemitting diode” \s “LED” \c 1 }) and energy harvesting and conversion has gradually increased the demand for low-density and high thermal conductive materials. In recent years, carbon fiber (CF{ TA \1 “CF; carbon fiber” \c 1 }) has been widely used for the preparation of polymer composites due to its good mechanical property and ultra-high thermal conductivity. CF materials easily form thermal conduction paths through polymer composites to improve the thermal conductivity. This paper describes the research progress, thermal conductivity mechanisms, preparation methods, factors influencing thermal conductivity and provides relevant suggestions for the development of CF composites for thermal management.

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Section: Thermal Transport Mechanismsmentioning

confidence: 99%

Section: Thermal Transport Mechanismsmentioning

confidence: 99%

Preparation, Properties and Mechanisms of Carbon Fiber/Polymer Composites for Thermal Management Applications

et al. 2021

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“…Thermal analysis 1,2 and associated thermoanalytical kinetics have gained wide popularity because from the beginning, it utilizes simplified procedures friendly to users. It is based on straight interpretation of measured data, which are taken directly proportional to the searched degree of conversion and then treated using simplified mathematical processing.…”

Section: Figurementioning

confidence: 99%

“…Figure 1 (dashed line). This approach 2,6 is usually sufficient in terms of its use in qualitative and quantitative (calorimetric) analysis, but in the field of kinetic study, it is part of a simplified practice applied over many years of routine 4,5 and thus hides the fact of using the wrong value of the reaction temperature, in other words, we are deceiving ourselves a little.…”

Section: Figurementioning

confidence: 99%

The evaluation of nonisothermal thermoanalytical kinetics is simplified without the description of heat transfers, such as thermal inertia, which is not negligible, as indicated by Vyazovkin

Šesták

2021

Int J of Chemical Kinetics

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In the field of thermoanalytical kinetics, which is widely used, basic questions arise regarding a possible description of the effect of heat transfer and subsequent thermal inertia. Current practice still uses a simplified interpretation of directly measured data for an inert sample at a constant temperature rise to describe the studied reaction, which leads to a simplified reaction conversion ratio, which is further used for various mathematical processing. The analysis of the introduced rectangular heat pulses and their indication by DTA clearly shows that the effect of thermal inertia is fundamental and not negligible. This is, after all, known from calorimetry, where the integral constant of inertia has historically been used to calibrate the descending temperature, but it cannot generally be applied to the whole temperature process due to its nonlinearity. In the case of parallel processing, for example by gradually increasing the heating rate, the effect of thermal inertia can be partially compensated for each other which have yet to be confirmed. However, for the kinetic analysis of a single peak, it is necessary to adapt to the effect of the thermal delay due to thermal inertia, which, similarly to the measured enthalpy, is tied to the sample size. Of course, it will be up to the researcher to find a solution that also includes the effect of heat transfer and dissipation, which should become the main principle of thermoanalytical methods of the future, as shown by current examples combining thermal processes with their specific kinetics.

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“…Keattch [46][47][48], and 1. Sestak [49][50][51]. of Emich [52], Gorbach [53], Cunningham [54] and Behmdt [55].…”

Section: Thermogravimetrymentioning

confidence: 99%

Some aspects on the history of thermal analysis

Jayaweera

Robensa

2012

Annales UMCS Chemia

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Historical Roots and Development of Thermal Analysis and Calorimetry

Cited by 20 publications

References 78 publications

Preparation, Properties and Mechanisms of Carbon Fiber/Polymer Composites for Thermal Management Applications

Preparation, Properties and Mechanisms of Carbon Fiber/Polymer Composites for Thermal Management Applications

The evaluation of nonisothermal thermoanalytical kinetics is simplified without the description of heat transfers, such as thermal inertia, which is not negligible, as indicated by Vyazovkin

Some aspects on the history of thermal analysis

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