A Measurement Technique for Thermal Conductivity Characterization of Ultra-High Molecular Weight Polyethylene Yarns Using High-Resolution Infrared Microscopy

Candadai, Aaditya A.; Weibel, Justin A.; Marconnet, Amy

doi:10.1109/itherm.2019.8757385

Cited by 3 publications

(5 citation statements)

References 24 publications

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“…Solving this differential equation, the temperature profile in the right side of the wire is of the form where m 2 = ( h r P )/( k w A ). The thermal conductivity of the wire, k w , is determined from a separate calibration experiment performed by heating the wire in the absence of the sample (also see S1.3 in the Supporting Information). This leaves the heat flow rate in the right side of the wire, Q R , as the only unknown parameter in eq , which is fit to the measured IR temperature profile using a least-squares algorithm.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Finally, with all terms in eq known, the thermal conductivity of the sample is calculated. Details of the uncertainty/sensitivity of the described measurement technique are presented in our recent work …”

Section: Experimental Methodsmentioning

confidence: 99%

“…where m 2 = (h r P)/(k w A). The thermal conductivity of the wire, k w , is determined from a separate calibration experiment performed by heating the wire in the absence of the sample 34 (also see S1.3 in the Supporting Information). This leaves the heat flow rate in the right side of the wire, Q R , as the only unknown parameter in eq 7, which is fit to the measured IR temperature profile using a least-squares algorithm.…”

Section: Acs Applied Polymer Materialsmentioning

confidence: 99%

“…Details of the uncertainty/sensitivity of the described measurement technique are presented in our recent work. 34 To validate the experimental approach, we characterize reference samples having known thermal conductivity using the developed metrology technique. Two different materials are chosen because they have a similar geometry as the yarn and fabric samples: a nichrome wire (circular cross section similar to the yarn) and a bulk HDPE film (rectangular cross section) of width comparable to the fabric sample.…”

Section: Acs Applied Polymer Materialsmentioning

confidence: 99%

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Thermal Conductivity of Ultrahigh Molecular Weight Polyethylene: From Fibers to Fabrics

Candadai

Weibel

Marconnet

2019

ACS Appl. Polym. Mater.

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Unique combinations of properties such as mechanical compliance and chemical stability make polymers attractive for many applications. However, the intrinsic low thermal conductivity of bulk polymers has generally limited their potential for heat dissipation applications, and in fact they are widely used as thermal insulators. But in recent years, gel-spun, ultra-oriented fibers made of ultra-high molecular weight polyethylene (UHMW-PE) have sparked interest in the thermal management community due to their exceptionally high thermal conductivity. These fibers are typically used in commercially-produced protective gear such as motorcycle jackets and ballistic vests due to their high mechanical strength, but they have not been widely utilized for heat spreading and thermal management applications. While recent studies have characterized individual fibers and ultra-drawn films, the thermal properties of fabrics constructed from these materials remain virtually unexplored. Here, we synthesize plain-weave fabrics from yarns of commercially available gel-spun UHMW-PE and measure the thermal properties of the individual microfibers, yarns, and woven fabrics using an in-house thermal characterization technique based on infrared microscopy. For the woven fabric, we report an effective in-plane thermal conductivity of ~10 Wm-1 K-1 in the direction aligned with the weft yarns, which is 2-3 orders of magnitude higher than conventional textile materials. This work reveals the high thermal conductivity of UHMW-PE fabrics that can be realized using a scalable textile manufacturing platform and lays the foundation for exploiting their unique thermomechanical properties for heat spreading functions in flexible/wearable devices.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Acs Applied Polymer Materialsmentioning

confidence: 99%

Section: Acs Applied Polymer Materialsmentioning

confidence: 99%

See 2 more Smart Citations

Thermal Conductivity of Ultrahigh Molecular Weight Polyethylene: From Fibers to Fabrics

Candadai

Weibel

Marconnet

2019

ACS Appl. Polym. Mater.

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“…Very recently, Candalai et al [19] presented an improved version of the "T-type probe" method for measuring the thermal conductivity of fiber strands in steady state. A wire, whose ends are held at a constant temperature, is heated by Joule effect.…”

Section: Introductionmentioning

confidence: 99%

Design of a new device for fibers strand axial thermal conductivity measurement

Bouyer

Tardif

Mercader³

et al. 2021

International Journal of Thermal Sciences

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A device for fibers strand axial thermal conductivity measurement has been designed and modelled by finite elements and realized. The method is based on Fourier's law in steady state and is inspired by the widely spread guarded hot plate method. This device has been designed to measure thermal conductivity on a wide range from 0.1 W/(m. K) to 100 W/(m. K) which represent the range of thermal conductivity found in fibrous materials. The numerical study has shown that radiative heat losses can reach the same order of magnitude than the researched conductive heat flux if no care is taken but are minimized when the temperature difference applied on the sample is centered on the temperature of the wall of the vacuum chamber enclosing the device. Measurements of thermal conductivity have been realized on three samples of bulk materials representative of the measurement range and on commercially available carbon fibers strands T300. The results are in good agreement with the values found in the literature and validate this device.

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Thermal and mechanical characterization of high performance polymer fabrics for applications in wearable devices

Candadai

Nadler

Burke

et al. 2021

Sci Rep

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With advances in flexible and wearable device technology, thermal regulation will become increasingly important. Fabrics and substrates used for such applications will be required to effectively spread any heat generated in the devices to ensure user comfort and safety, while also preventing overheating of the electronic components. Commercial fabrics consisting of ultra-high molecular weight polyethylene (UHMW-PE) fibers are currently used in personal body armor and sports gear owing to their high strength, durability, and abrasion resistance. In addition to superior mechanical properties, UHMW-PE fibers exhibit very high axial thermal conductivity due to a high degree of polymer chain orientation. However, these materials have not been widely explored for thermal management applications in flexible and wearable devices. Assessment of their suitability for such applications requires characterization of the thermal and mechanical properties of UHMW-PE in the fabric form that will ultimately be used to construct heat spreading materials. Here, we use advanced techniques to characterize the thermal and mechanical properties of UHMW-PE fabrics, as well as other conventional flexible materials and fabrics. An infrared microscopy-based approach measures the effective in-plane thermal conductivity, while an ASTM-based bend testing method quantifies the bending stiffness. We also characterize the effective thermal behavior of fabrics when subjected to creasing and thermal annealing to assess their reliability for relevant practical engineering applications. Fabrics consisting of UHMW-PE fibers have significantly higher thermal conductivities than the benchmark conventional materials while possessing good mechanical flexibility, thereby showcasing great potential as substrates for flexible and wearable heat spreading application.

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A Measurement Technique for Thermal Conductivity Characterization of Ultra-High Molecular Weight Polyethylene Yarns Using High-Resolution Infrared Microscopy

Cited by 3 publications

References 24 publications

Thermal Conductivity of Ultrahigh Molecular Weight Polyethylene: From Fibers to Fabrics

Thermal Conductivity of Ultrahigh Molecular Weight Polyethylene: From Fibers to Fabrics

Design of a new device for fibers strand axial thermal conductivity measurement

Thermal and mechanical characterization of high performance polymer fabrics for applications in wearable devices

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