Thermal Properties of Crystalline Polymers at Low Temperatures

Engeln, I.; Meissner, M.

doi:10.1007/978-1-4613-3365-4_1

Cited by 7 publications

(5 citation statements)

References 28 publications

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“…This is furthermore surprising considering the studies on polycrystalline polyethylene which revealed an over 3-fold increase in thermal conductivity with increasing crystallinity level from 44% to 98%. 31 This result can be understood by considering the microstructure of semicrystalline polymer semiconductors, which comprise crystalline domains separated by an amorphous phase. For sufficiently large fraction of crystalline phase, long tie chains in amorphous regions interconnect the crystallites, which creates a network for efficient charge transport.…”

Section: Evolution Of Thermal Conductivity Upon Thermal Annealingmentioning

confidence: 99%

Investigation of the effect of microstructural changes on thermal transport in semicrystalline polymer semiconductors

et al. 2019

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Great progress in the development of new semiconducting polymers over the last two decades alongside improved understanding of electron transport mechanisms have resulted in a dramatic increase in the electron mobility of these materials making them promising candidates for electronic and thermoelectric applications. Heat transport phenomena, on the other hand-which govern thermal conductivity-have not received as much attention up to date. In spite of the simplicity of the principle behind the measurement of thermoelectric properties, the combined uncertainty in thermoelectric figure of merit zT could easily reach 50% with the largest uncertainty coming from thermal conductivity measurements. Such a high measurement uncertainty, often comparable to relative variations in zT encountered when optimizing within a given class of materials, prevents the study of structure-thermal property relationships. Here we present a protocol for the measurement of the thermal conductivity of thin films with reduced measurement uncertainty, which allowed us to investigate the effect of microstructural changes on the thermal conductivity of the conjugated polymer P(NDI2OD-T2). We show that the enhancement of the thermal conductivity upon annealing is much less pronounced than the corresponding increase in the electron mobility that has been reported under the same annealing conditions in the literature. This suggests that semicrystalline conjugated polymers in which thermal transport remains limited by the amorphous domain boundaries in between crystalline grains could be a suitable system for realizing the electron-crystal phonon glass concept and enable higher performance thermoelectric materials.

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Section: Evolution Of Thermal Conductivity Upon Thermal Annealingmentioning

confidence: 99%

Investigation of the effect of microstructural changes on thermal transport in semicrystalline polymer semiconductors

et al. 2019

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“…A similar peak is seen in many crystalline solids as well with some exceptions, e.g. it is absent in crystalline polyethylene [10]. Using the height of the maximum in C/T 3 , P c , and its position, T max , as parameters, the maximum can be scaled into several universal classes by plotting (C/T 3 )/P c vs. T/T max [9].…”

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confidence: 99%

Specific-heat anomaly of amorphous solids at intermediate temperatures (1 to 30 K)

Liu

Löhneysen

1996

Europhys. Lett.

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An analysis of the specific heat C of various amorphous solids at intermediate temperatures (1 K ≤ T ≤ 30 K) shows that the two parameters characterizing the maximum in C/T 3 vs. T , namely its height Pc and position Tmax, are related to each other as Pc ∝ T −1.6 max . Surprisingly, this relation is valid not only for all the amorphous solids whose intermediate-T specific heat can be found in the literature, but also for many of the corresponding crystalline solids. This suggests a general correlation between the mechanisms leading to the C/T 3 maximum in amorphous and crystalline solids. The established relation, together with the scaling property found earlier, contributes towards a unified understanding of the low-and intermediate-T properties of amorphous solids.

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“…The structure and properties of these materials can change dramatically when they are exposed to cryogenic temperatures, especially in a cyclical fashion [31][32][33]. Therefore, the work presented in this chapter investigated the effects of nanoscale matrix modifications on the properties of macro-scale composite materials at low Buehler Ltd. were used to modify the base matrix formulation.…”

Section: Research Motivation Nanoparticle Reinforcement Of Continuousmentioning

confidence: 99%

“…The span to thickness ratio was set to 16 for all of the samples tested. Mode I interlaminar fracture toughness was measured using the double cantilever beam (DCB) method [31] according to ASTM D 5528-94a [32]. Each specimen was precracked in the mechanical testing apparatus to provide a sharp crack tip before testing.…”

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confidence: 99%

Cryogenic Cycling Behavior of Polymeric Composite Materials

Seferis¹

2002

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Thermal Properties of Crystalline Polymers at Low Temperatures

Cited by 7 publications

References 28 publications

Investigation of the effect of microstructural changes on thermal transport in semicrystalline polymer semiconductors

Investigation of the effect of microstructural changes on thermal transport in semicrystalline polymer semiconductors

Specific-heat anomaly of amorphous solids at intermediate temperatures (1 to 30 K)

Cryogenic Cycling Behavior of Polymeric Composite Materials

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