The Thermal Transport Properties of Polymers

Hands, D. Wade

doi:10.5254/1.3535156

Cited by 65 publications

(27 citation statements)

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“…It is pertinent to remark here that our data qualitatively support the intuitive belief that the thermal conductivity of amorphous polymers gradually decreases as their molecular structure becomes more complicated [8][9][10][11][12]. In fact, in a series of polyolefins the maximum thermal conductivity was found for PE which has the simplest and the most symmetrical molecular structure; apparently for the same reason the highest ~na(0) in a series of halogen-substituted polymers is that for PTFE.…”

Section: Thermal Conductivity Of Molten Polymerssupporting

confidence: 71%

“…In our opinion, the observed discrepancy may be a consequence of one of the following reasons: a) Equation (12) underestimates the values of ~,IB and thus obviously leds to overestimated values offo(0, T). b) Theory [32] takes into consideration only a rather modest amount of thermodynamically equilibrium defects of a crystalline lattice, while in real polymer crystals it is the non-equilibrium defects that are much more numerous.…”

Section: Thermal Conductivity Of Solid Polymersmentioning

confidence: 85%

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Effect of pressure on the thermal conductivity of polymers

Privalko

Rekhteta

1992

Journal of Thermal Analysis

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The thermal conductivity of polyolefins and halogen-substituted polymers was studied in a broad temperature interval spanning both solid and melt states, in the range of pressures from 0.1 up to 100 MPa with the aid of a high-pressure ~,--calorimeter in the continuous heating regime. Treatment of data on the pressure dependence of the thermal conductivity of melts in terms of Barker's equation yielded the values of 'quasilattice' Grueneisen parameter yB which exhibited the same dependence on molecular structure of a polymer as the parameter 3C/p from the Simha-Somcynsky equation of state (number of external degress of freedom per chain repeat unit). Analysis of the dependence of the thermal conductivity of polyethylene on the degree of crystallinity revealed the inadequacy of the current two-phase model which does not account for the microheterogeneity of the 'amorphous phase'. It was concluded that interehaln heat transfer makes the dominant contribution to the thermal conductivity of polymers both in amorphous and in crystalline states.

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Section: Thermal Conductivity Of Molten Polymerssupporting

confidence: 71%

Section: Thermal Conductivity Of Solid Polymersmentioning

confidence: 85%

Effect of pressure on the thermal conductivity of polymers

Privalko

Rekhteta

1992

Journal of Thermal Analysis

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“…A review of techniques and results is given by Hands, 1 and, more recently, by Dutta and Mashelkar 2 and van Krevelen. 3 Most methods involve imposing either a known temperature gradient and measuring the heat flux, or vice versa.…”

Section: Introductionmentioning

confidence: 99%

Measurement of thermal diffusivity in polymer melts using forced Rayleigh light scattering

Venerus

Schieber

Iddir

et al. 1999

J. Polym. Sci. B Polym. Phys.

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Thermal diffusivity measurements on three polymer melts were made using the Forced Rayleigh Light Scattering technique. The polymers, which were tested at room temperature where they are in the molten state, included a polydimethylsiloxane and two polyisobutylenes. The optical setup and procedures developed in this study to conduct thermal Forced Rayleigh Light Scattering experiments are shown to be capable of producing thermal diffusivity data with a high degree of accuracy and precision. From measurements on a reference fluid (ethanol), experimental error was estimated to be no greater than 2%, and could be reduced to less than 1% by appropriate design of a series of experiments. Discrepancies of 4 and 14% in thermal diffusivity data on the polymer samples between measured values and those found in the literature were observed. It is suggested that these deviations are attributable to either sample variations or to errors in the techniques used in previous investigations. © 1999 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 37: 1069–1078, 1999

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“…The rate of change of temperature at the center was then monitored with an embedded thermocouple. 23 The sample geometry chosen was "infinite" flat slabs.…”

Section: Thetmal Difhsivify Measurementmentioning

confidence: 99%

Vulcanization of rubber. Kinetic parameters for SBR and simulations of vulcanization in a mold

Jönsson

Flodin

1991

J of Applied Polymer Sci

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SYNOPSISDifferential scanning calorimetry ( DSC ) was used to characterize the vulcanization of styrene-butadiene rubber ( S B R ) . The effect of three different fillers on the vulcanization process was also investigated. The fillers used were carbon black HAF and SRF and silica. The calculated reaction orders, activation energy, reaction energy, and preexponential factor, completed with physical properties, were used to calculate the temperature and extent of reaction inside a mold with time. The mathematical model used yields results that are in fair agreement with experimental temperature measurements inside the mold.

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The Thermal Transport Properties of Polymers

Cited by 65 publications

References 0 publications

Effect of pressure on the thermal conductivity of polymers

Effect of pressure on the thermal conductivity of polymers

Measurement of thermal diffusivity in polymer melts using forced Rayleigh light scattering

Vulcanization of rubber. Kinetic parameters for SBR and simulations of vulcanization in a mold

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