Thermal properties of rigid polymers. I. Measurement of thermal conductivity and questions concerning contact resistance

Hall, J. A.; Ceckler, W.H.; Thompson, Edward V.

doi:10.1002/app.1987.070330615

Cited by 25 publications

(3 citation statements)

References 5 publications

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“…The effect of contact resistance on the temperature readings in similar systems has been shown to be small, chiefly due to the excellent adhesion of the epoxy to the thermocouple wire [22]. The coefficient of thermal expansion of amine-cured epoxy resins is approximately 6.81 Â 10 À5 K À1 [23].…”

Section: Temperature Measurementmentioning

confidence: 99%

On-Line Processing of Unidirectional Fiber Composites Using Radiative Heating: II. Radiative Properties, Experimental Validation and Process Parameter Selection

Chern

Moon

Howell

2002

Journal of Composite Materials

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Experimental validation is presented for a detailed thermal model (described in Paper I) for on-line processing of unidirectional fiber composites by surface or volumetric radiative heating. Surface and volumetric radiative properties of unidirectional graphite/epoxy and glass/epoxy are presented: measurements of the complex refractive index of an uncured and cured 3501-6 epoxy resin as a function of wavelength; semi-empirical extinction and scattering coefficients and phase functions for graphite/epoxy and glass/epoxy as a function of wavelength and incident angle, assuming independent scattering; model predictions of the effects of dependent scattering (i.e. electromagnetic wave interference) in graphite/epoxy and glass/epoxy; and measurements of the directional-hemispherical reflectance of AS4/3501-6 as a function of wavelength, incident angle, unidirectional composite orientation, and degree of cure. Experimental temperature histories for in-situ (or continuous) curing of graphite/epoxy, hoop-wound cylinders using infrared (IR) heating at power levels of 5 and 7 kW and mandrel winding speeds of 0.1 and 0.15 m/s are presented. Good qualitative agreement is found between the experimental results and model predictions for AS4/3501-6. Recommended manufacturing process windows for graphite/epoxy and glass/epoxy are presented for several process parameters, such as radiant-source emissive power level and winding speed. Due to their higher radiation absorptivity and lower heat capacity, graphite composites generally have narrower process windows.

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Section: Temperature Measurementmentioning

confidence: 99%

On-Line Processing of Unidirectional Fiber Composites Using Radiative Heating: II. Radiative Properties, Experimental Validation and Process Parameter Selection

Chern

Moon

Howell

2002

Journal of Composite Materials

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“…We have taken the solution from [3] that includes the effect of contact resistance, and determined that even for worst-case values of contact resistance anticipated (= 0.9 X 10-4 01 2 K/W for silicon chip/aluminum with 0.02-mm epoxy [4]), the effect on the expected values of thermal conductivity for the measurements presented here will be less than 0.08%. The influence of contact resistance in systems similar to that studied here is also shown from experimental results to be small in both [5] and [13], chiefly because of the excellent adhesion of the epoxy material to the heater wire. The coefficient of thermal expansion of amine-cured epoxy resins is approximately 6.81 X 10-5 K-' [14].…”

Section: Contact Resistancementioning

confidence: 71%

Measurement of the Temperature and Cure Dependence of the Thermal Conductivity of Epoxy Resin

Chern

Moon

Howell

1993

Experimental Heat Transfer

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Measurements of the thermal conductivity of a commonly used epoxy resin are presented as a function of temperature and degree of cure. The temperature range of measurement varies with degree of cure, as the range must be below the temperature that will initiate further curing of the resin. Measurements at degrees of cure of 1l.5%, 5/.2%, and 100% are presented, with corresponding temperature rangesfrom 290 k to 360 k, 373 k, and 500 k, respectively. The line-source method for determining thermal conductivity is used for the measurements. The errors present in the application of this method to this material system are discussed.

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“…This is even more the case of a metal, such as In, used as a reference substance for temperature calibration. Furthermore, at the melting temperature of In the contact resistance between In and a solid polymer is negligible [14,23] (namely, contact resistances are defined only for contact between two solids) and, because of the high thermal conductivity of In, only the polymer limits the heat exchange rate. Indeed, the DSC curve International Journal of Polymer Science of In laying on PTFE shows that the fusion of In apparently occurs at temperature higher than its melting temperature (156.6 ∘ C) when an underlain sheet of PTFE is also present.…”

Section: Theorymentioning

confidence: 99%

Kinetics of Phase Transformation of Indium in the Presence of Polytetrafluoroethylene: Implications for DSC Measurements on Polymers and Their Composites

Raimo

2015

International Journal of Polymer Science

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The present work focuses on the influence, at nominal constant temperatures, of an inert polymer on the crystallization kinetics of a highly conductive metal as indium (In) to show not only that the presence of a polymer allows obtaining information on the In crystallization directly from differential scanning calorimeter (DSC) curves, but also that appropriate corrections of thermal measurements on low conductivity samples are needed.

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Thermal properties of rigid polymers. I. Measurement of thermal conductivity and questions concerning contact resistance

Cited by 25 publications

References 5 publications

On-Line Processing of Unidirectional Fiber Composites Using Radiative Heating: II. Radiative Properties, Experimental Validation and Process Parameter Selection

On-Line Processing of Unidirectional Fiber Composites Using Radiative Heating: II. Radiative Properties, Experimental Validation and Process Parameter Selection

Measurement of the Temperature and Cure Dependence of the Thermal Conductivity of Epoxy Resin

Kinetics of Phase Transformation of Indium in the Presence of Polytetrafluoroethylene: Implications for DSC Measurements on Polymers and Their Composites

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