Thermal conductivity of electrospun polyethylene nanofibers

Ma, Jian; Zhang, Qian; Mayo, Anthony; Zhang, Ni; Hong, Yuling; Chen, Yunfei; Mu, R.; Bellan, Leon M.; Li, Deyu

doi:10.1039/c5nr04995d

Cited by 124 publications

(100 citation statements)

References 46 publications

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“…Thermal bridge method is very successful in measuring thermal conductivity of suspended single polymer fibers and films . However, there are limitations.…”

Section: Theoretical and Experimental Approachesmentioning

confidence: 99%

Thermal Transport in Conductive Polymer–Based Materials

Zhou

Chen

2019

Adv Funct Materials

163

106

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The demand for flexible conductive materials has motivated many recent studies on conductive polymer–based materials. However, the thermal conductivity of conductive polymers is relatively low, which may lead to serious heat dissipation problems for device applications. This review provides a summary of the fundamental principles for thermal transport in conductive polymers and their composites, and recent advancements in regulating their thermal conductivity. The thermal transport mechanisms in conductive polymer–based materials and up‐to‐date experimental approaches for measuring thermal conductivity are first summarized. Effective approaches for the regulation of thermal conductivity are then discussed. Finally, thermal‐related applications and future perspectives are given for conductive polymers and their composites.

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“…Thermal bridge method is very successful in measuring thermal conductivity of suspended single polymer fibers and films . However, there are limitations.…”

Section: Theoretical and Experimental Approachesmentioning

confidence: 99%

Thermal Transport in Conductive Polymer–Based Materials

Zhou

Chen

2019

Adv Funct Materials

163

106

View full text Add to dashboard Cite

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“…However, evaluation of the insulation potential in the electrospun nanofiber sheets is a great challenge, due to their sensitivity to pressure, which modifies the porosity and packaging nanofibers in the material. In general, researchers mainly focus on the thermal conductivity measurements along the individual fiber length, showing extremely high thermal conductivity when compared to bulk materials . In our early study, we have also found high anisotropy in the thermal conductivity of the electrospun thin membranes: These materials are highly conductive in the plane direction but with extreme insulation behavior perpendicular to the plane .…”

Section: Resultsmentioning

confidence: 67%

“…In general, researchers mainly focus on the thermal conductivity measurements along the individual fiber length, showing extremely high thermal conductivity when compared to bulk materials. 62 In our early study, we have also found high anisotropy in the thermal conductivity of the electrospun thin membranes: These materials are highly conductive in the plane direction but with extreme insulation behavior perpendicular to the plane. 63 The transient plane source technique, which is a basis of the hot disk method, is one of the most acceptable methods for the measurement of polymer nanofiber-based materials.…”

Section: Heat Transfermentioning

confidence: 89%

Polystyrene nanofibers for nonwoven porous building insulation materials

Datsyuk

Trotsenko

Peikert³

et al. 2019

Engineering Reports

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The building industry makes a great effort to reduce energy consumption. The use of nanotechnology is one of the approaches to surpassing the properties of conventional insulation materials. In this work, an industrial cost‐effective method to manufacture highly porous materials with excellent thermal insulation properties is described. The materials are prepared from polystyrene recovered from the building sector and electrospun as nanofiber‐based sheets. Varying electrospinning parameters allow controlling the morphology of the produced materials. The materials are obtained with differences in interfiber and inner‐fiber porosity and morphology. The thermal conductivity of the freestanding and compressed materials is evaluated. Those differences affect the insulation performance: the materials with higher interfiber porosity show better thermal insulation in the freestanding state. An increase of the inner‐fiber porosity leads to better insulation in the compressed samples. Insertion of carbon nanomaterials reduces the effects of the infrared Radiation. Nanofiber‐based insulation materials from the recycled expanded polystyrene (EPS) show thermal conductivity values of 20 to 25 mW/mK (ie, 20% to 30% below the thermal conductivity of the commercial EPS). The effect of integrating polystyrene nanofiber sheets into conventional wall‐building materials is also investigated in terms of thermal insulation. The nanofiber insulation sheets are sandwiched between two pieces of the building materials resulting in a drastic increase of the insulation effect. The materials have a great potential in using, for example, as thermal insulation for the restoration of historic buildings in the narrow central parts of the old towns.

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“…With water permeated into the polymer backbone, polymer chains in hydrogel could be stretched. In polymer system, stretching is an effective method to enlarge thermal conductive property in polymer system because of the accompanied better chain alignment and less defects [18,31,32]. The thermal conductivity of the drawn nanofibers could be as high as 104 Wm -1 K -1 .…”

Section: Resultsmentioning

confidence: 99%

Thermal Conduction Behaviors of PAAm Hydrogels

Tang¹,

Peng²,

Guo³

et al. 2017

Preprint

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Abstract:As the interface between human and machine becomes blurred, hydrogel incorporated electronics and devices have emerged to be a new class of flexible/stretchable electronic and ionic devices due to their extraordinary properties, such as soft, mechanically robust and biocompatible. However, heat dissipation in these devices could be a critical issue and remains unexplored. Here, we report the experimental measurements and equilibrium molecular dynamics simulations of thermal conduction in polyacrylamide (PAAm) hydrogels. The thermal conductivity of PAAm hydrogels can be modulated by both the crosslinking density and water content in hydrogels. The crosslinking density dependent thermal conductivity in hydrogels varies from 0.33 to 0.51 Wm -1 K -1 , giving a 54% enhancement. We attribute the crosslinking effect to the competition between the increased conduction pathways and the enhanced phonon scattering effect. Moreover ， water content can act as filler in polymers which lead to nearly 40% enhancement in thermal conductivity in PAAm hydrogels with water content vary from 23 to 88 wt%. Furthermore，we find the thermal conductivity of PAAm hydrogel is insensitive to temperature in the range of 25 o C -40 o C. Our study offers fundamental understanding of thermal transport in soft materials and provides design guidance for hydrogel-based devices.

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Thermal conductivity of electrospun polyethylene nanofibers

Cited by 124 publications

References 46 publications

Thermal Transport in Conductive Polymer–Based Materials

Thermal Transport in Conductive Polymer–Based Materials

Polystyrene nanofibers for nonwoven porous building insulation materials

Thermal Conduction Behaviors of PAAm Hydrogels

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