Modelling of Effective Thermal Conductivity of Composites Filled with Core-Shell Fillers

An effective model to calculate thermal conductivity of polymer composites using core-shell fillers is presented, wherein a core material of filler grains is covered by a layer of a high-thermal-conductivity (HTC) material. Such fillers can provide a significant increase of the composite thermal con...

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Bibliographic Details
Published in:Materials 2020-12, Vol.13 (23), p.5480
Main Authors: Czyzewski, Jan, Rybak, Andrzej, Gaska, Karolina, Sekula, Robert, Kapusta, Czeslaw
Format: Article
Language:English
Subjects:
Boron
Boron nitride
Composite materials
Conductivity
Epoxy resins
Fillers
Graphene
Heat conductivity
Heat transfer
Material properties
Mathematical models
Modelling
Nanoparticles
Platelets
Polymer matrix composites
Porous materials
System effectiveness
Thermal conductivity
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Summary:An effective model to calculate thermal conductivity of polymer composites using core-shell fillers is presented, wherein a core material of filler grains is covered by a layer of a high-thermal-conductivity (HTC) material. Such fillers can provide a significant increase of the composite thermal conductivity by an addition of a small amount of the HTC material. The model employs the Lewis-Nielsen formula describing filled systems. The effective thermal conductivity of the core-shell filler grains is calculated using the Russel model for porous materials. Modelling results are compared with recent measurements made on composites filled with cellulose microbeads coated with hexagonal boron nitride (h-BN) platelets and good agreement is demonstrated. Comparison with measurements made on epoxy composites, using silver-coated glass spheres as a filler, is also provided. It is demonstrated how the modelling procedure can improve understanding of properties of materials and structures used and mechanisms of thermal conduction within the composite.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma13235480