Superior, processing-dependent thermal conductivity of cellulose Nanocrystal-Poly(vinyl alcohol) composite films

Chowdhury, Raqib; Rai, Amit; Glynn, Evan; Morgan, Patrick; Moore, Arden L.; Youngblood, Jeffrey P.

doi:10.1016/j.polymer.2019.01.006

Cited by 23 publications

(26 citation statements)

References 39 publications

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“…Actually, simultaneous pursuit of optical transparency and superior thermal conductivity has been reported in the preceding papers [41,58]. Chowdhury et al emphasize another positive effect arising from the matrix polymers; filling up voids in the pristine NC materials with the polymers would reduce interfacial thermal resistance inside the system [59].…”

Section: Nanocelluloses As Heat-conducting Fillersmentioning

confidence: 96%

“…The thermal conductivity value was 1.1 W·m −1 ·K −1 , which is about 7 times higher than that of the pure epoxy resin. Following this, several groups have reported their attempts to utilize NCs as thermally conductive fillers [57][58][59]. The main purpose of employing matrix polymers would be to obtain optically transparent nanocomposites.…”

Section: Nanocelluloses As Heat-conducting Fillersmentioning

confidence: 99%

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Nanocelluloses and Related Materials Applicable in Thermal Management of Electronic Devices: A Review

2020

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Owing to formidable advances in the electronics industry, efficient heat removal in electronic devices has been an urgent issue. For thermal management, electrically insulating materials that have higher thermal conductivities are desired. Recently, nanocelluloses (NCs) and related materials have been intensely studied because they possess outstanding properties and can be produced from renewable resources. This article gives an overview of NCs and related materials potentially applicable in thermal management. Thermal conduction in dielectric materials arises from phonons propagation. We discuss the behavior of phonons in NCs as well.

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Section: Nanocelluloses As Heat-conducting Fillersmentioning

confidence: 96%

Section: Nanocelluloses As Heat-conducting Fillersmentioning

confidence: 99%

Nanocelluloses and Related Materials Applicable in Thermal Management of Electronic Devices: A Review

2020

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“…Thermal resistance and scattering effect are suppressed during thermal energy transfer, and thermal conductivity is improved without sacrificing of excellent physical and chemical properties of polymers due to the increasing of phonon transport pathways in intramolecular and interchain. [9][10][11][12][13][14][15] Thermal conductivity of intrinsic thermal conductive polymers is affected by many factors, such as the elemental composition of the molecular chain, structural rigidity, cross-linking branching as well as the molecular interaction. Parameters that affect the ordered arrangement of molecular chains would also be of importance to the related thermal conductivity of polymers.…”

Section: Introductionmentioning

confidence: 99%

“…Intrinsic thermally conductive polymers are based on reducing spatial defects of microscopic structure to decrease the chain entanglement and improve the ordered arrangement of molecular chains. Thermal resistance and scattering effect are suppressed during thermal energy transfer, and thermal conductivity is improved without sacrificing of excellent physical and chemical properties of polymers due to the increasing of phonon transport pathways in intramolecular and inter‐chain 9–15 . Thermal conductivity of intrinsic thermal conductive polymers is affected by many factors, such as the elemental composition of the molecular chain, structural rigidity, cross‐linking branching as well as the molecular interaction.…”

Section: Introductionmentioning

confidence: 99%

High thermal conductivity of liquid crystalline monomer‐poly (vinyl alcohol) dispersion films containing microscopic‐ordered structure

Gong

et al. 2020

J of Applied Polymer Sci

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The thermal conductivity of bulk polymers is usually very low, which is due to the amorphous domains where chains are randomly entangled, improving the degree of the chain alignment and forming a continuous thermal conduction network are expected to enhance the thermal conductivity. A series of liquid crystalline monomer-poly (vinyl alcohol) dispersion (MDLC) films with high thermal conductivity containing microscopic-ordered structure were prepared by introducing a highly ordered liquid crystalline monomer (LCM) exhibiting Smectic phase. The thermal conductivity of MDLC films was strongly related to the amount of LCM, which firstly increased and then decreased with the increase of LCM content. The thermal conductivity of MDLC film reached up to 1.20 W m −1 K −1 when the content of LCM was 15 wt% and rapidly decreased to 0.85 W m −1 K −1 as the content of LCM further increased to 25 wt%. LCM with low content (1-15 wt%) showed good fluidity, dispersity and interfacial compatibility in PVA molecular chains, which further increases the regularity of molecular chains alignment.

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“…Synthetic polymers have been widely used in encapsulation of electronic devices as traditional insulating packaging materials [11,12,13]. However, the thermal conductivities of synthetic polymer materials are usually very low (about 0.1~0.5 W·m −1 K −1 at room temperature) [7,14,15,16,17], and polymer itself also has aging issues leading to embrittlement, such as polyimide (PI) [18], polyimide 11 (PI 11) [19], and polyethylene (PE) [20] films. Hence, it is an inevitable trend for the electronic and electrical equipment industry to replace synthetic polymer materials with green and eco-friendly insulating materials with high thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Aerogel Perfusion-Prepared h-BN/CNF Composite Film with Multiple Thermally Conductive Pathways and High Thermal Conductivity

Wang

et al. 2019

Nanomaterials

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Hexagonal boron nitride (h-BN)-based heat-spreading materials have drawn considerable attention in electronic diaphragm and packaging fields because of their high thermal conductivity and desired electrical insulation properties. However, the traditional approach to fabricate thermally conductive composites usually suffers from low thermal conductivity, and cannot meet the requirement of thermal management. In this work, novel h-BN/cellulose-nano fiber (CNF) composite films with excellent thermal conductivity in through plane and electrical insulation properties are fabricated via an innovative process, i.e., the perfusion of h-BN into porous three dimensional (3D) CNF aerogel skeleton to form the h-BN thermally conductive pathways by filling the CNF aerogel voids. When at an h-BN loading of 9.51 vol %, the thermal conductivity of h-BN/CNF aerogel perfusion composite film is 1.488 W·m−1·K−1 at through plane, an increase by 260.3%. The volume resistivity is 3.83 × 1014 Ω·cm, superior to that of synthetic polymer materials (about 109~1013 Ω·cm). Therefore, the resulting h-BN/CNF film is very promising to replace the traditional synthetic polymer materials for a broad spectrum of applications, including the field of electronics.

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Superior, processing-dependent thermal conductivity of cellulose Nanocrystal-Poly(vinyl alcohol) composite films

Cited by 23 publications

References 39 publications

Nanocelluloses and Related Materials Applicable in Thermal Management of Electronic Devices: A Review

Nanocelluloses and Related Materials Applicable in Thermal Management of Electronic Devices: A Review

High thermal conductivity of liquid crystalline monomer‐poly (vinyl alcohol) dispersion films containing microscopic‐ordered structure

Aerogel Perfusion-Prepared h-BN/CNF Composite Film with Multiple Thermally Conductive Pathways and High Thermal Conductivity

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