Influence of high pressure on the specific heat of amorphous polymers at low temperatures

Jäckel, M.; Geilenkeuser, R.; Gladun, A.

doi:10.1016/s0921-4526(02)00564-1

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…41 Thermal methods involve fitting the thermal conductivity over a temperature range (1-100 K) 42 to obtain the deformation potential as a fitting parameter, and thermal conductivity experiments under high-pressure conditions have only been reported for a handful of polymers. Pressuredependent thermal conductivity studies of polystyrene (PS) 43 and polycarbonate (PC) 44 indicate that low-temperature (<5 K) acoustic velocities increased by 10-20% from 0 to 5 kbar, while the deformation potential of PS increased by a factor of 5 for a pressure increase from 0 to 4 kbar. 43 Thus, pressure-induced changes in the TLS-phonon coupling constant are expected to be largely dominated by the pressure-induced increase of the deformation potential.…”

Section: T H Imentioning

confidence: 99%

High-Pressure Studies of Optical Dephasing in Polymer Glasses

McIntire¹,

Yamaguchi²,

Kol'chenko³

et al. 2005

J. Phys. Chem. B

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The effect of high pressure on the optical dephasing of chromophores in organic polymers at low temperature is evaluated within the stochastic sudden jump two-level-system (TLS) model. The approximations within the "standard" TLS model cannot account for the observed pressure dependence of the pure dephasing rate without ad hoc assumptions about changes in the TLS density of states. However, the photon echo model of Geva and Skinner for disordered systems can be used to model pressure-dependent optical dephasing results for a variety of doped polymer systems without assuming changes in the TLS density of states. The relative importance of pressure-induced changes in TLS density, chromophore-TLS coupling, and TLS-phonon coupling is evaluated by fitting experimental high-pressure photon echo results to the TLS model.

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Section: T H Imentioning

confidence: 99%

High-Pressure Studies of Optical Dephasing in Polymer Glasses

McIntire¹,

Yamaguchi²,

Kol'chenko³

et al. 2005

J. Phys. Chem. B

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Empirical universal approach to describing the thermal conductivity of amorphous polymers: Effects of pressure, radiation and the Meyer–Neldel rule

Krivchikov,

Korolyuk

2024

Low Temperature Physics

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In this study, we propose and validate a universal temperature-dependent model for characterizing the thermal conductivity of amorphous polymers over a wide temperature range. Our approach captures key features in the thermal conductivity data, including a plateau, an inflection point, and the subsequent increase and saturation with rising temperature. Importantly, this model proves effective not only for pristine amorphous polymers but also for polymers subjected to external influences. We investigate the temperature-dependent thermal conductivity of amorphous polymer materials under various external conditions, such as hydrostatic pressure, radiation exposure, and the incorporation of fillers. Our analysis reveals novel insights into the dual-channel heat transfer mechanisms within amorphous polymers. Specifically, we observe a linear relationship between the logarithm of the “coherence” conductivity pre-factor and the characteristic energy, consistent with the Meyer–Neldel rule governing thermal conductivity. This research advances our understanding of thermal transport in amorphous polymers and underscores the applicability of the proposed universal model in describing complex thermal behavior across different conditions.

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Influence of high pressure on the specific heat of amorphous polymers at low temperatures

Cited by 2 publications

References 9 publications

High-Pressure Studies of Optical Dephasing in Polymer Glasses

High-Pressure Studies of Optical Dephasing in Polymer Glasses

Empirical universal approach to describing the thermal conductivity of amorphous polymers: Effects of pressure, radiation and the Meyer–Neldel rule

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