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Modelling of Effective Thermal Conductivity of Composites Filled with Core-Shell Fillers
Jan Czyzewski1, Andrzej Rybak2, Karolina Gaska3,4
1Hitachi ABB Power Grids Research, 31-154 Krakow, Poland.
Materials (Basel, Switzerland)
|December 4, 2020
Summary
A new model enhances polymer composite thermal conductivity using core-shell fillers with high thermal conductivity (HTC) materials. This approach significantly boosts composite performance with minimal HTC material addition.
Area of Science:
- Materials Science
- Polymer Composites
- Thermal Properties
Background:
- Polymer composites often require enhanced thermal conductivity for advanced applications.
- Core-shell fillers offer a strategy to improve thermal performance by incorporating high thermal conductivity (HTC) materials.
- Understanding the relationship between filler structure and composite thermal conductivity is crucial.
Purpose of the Study:
- To develop and validate an effective model for calculating the thermal conductivity of polymer composites utilizing core-shell fillers.
- To demonstrate the potential of small amounts of HTC material in core-shell fillers to significantly increase composite thermal conductivity.
- To provide insights into the mechanisms of thermal conduction in such composite materials.
Main Methods:
- The study employs the Lewis-Nielsen formula for filled systems to model effective thermal conductivity.
- The Russel model for porous materials is utilized to calculate the effective thermal conductivity of individual core-shell filler grains.
- The model's predictions are validated against experimental measurements on specific composite systems.
Main Results:
- The developed model accurately predicts the thermal conductivity of polymer composites with core-shell fillers.
- Experimental validation using cellulose microbeads coated with hexagonal boron nitride (h-BN) and silver-coated glass spheres shows good agreement with model predictions.
- The research confirms that small additions of HTC material in a core-shell structure can lead to substantial improvements in composite thermal conductivity.
Conclusions:
- The presented model provides an effective framework for designing polymer composites with tailored thermal conductivity.
- Core-shell fillers are a promising approach for enhancing thermal performance in polymer composites.
- The modeling procedure aids in understanding material properties and thermal conduction mechanisms within composites.
Keywords:
analytical modellingboron nitridecellulosecore-shell fillereffective thermal conductivityepoxy resinfilled epoxypolymer-matrix compositethermal propertiesMore Related Videos
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