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Thermal Conductivity of the Graphene/Polydimethylsiloxane Composite by Manipulating the Network Structure
Yangyang Gao1,2, Zoumeng Hu1,2, Wenfeng Zhang1,2
1State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 10029, People's Republic of China.
Langmuir : the ACS Journal of Surfaces and Colloids
|August 3, 2024
Summary
The thermal conductivity of graphene/polydimethylsiloxane composites increases with graphene content and stacking area. Defects in graphene affect thermal conductivity differently based on type, influencing heat transfer pathways.
Area of Science:
- Materials Science
- Nanotechnology
- Polymer Science
Background:
- Graphene (GE) is a promising filler for enhancing polymer composite properties.
- Understanding the influence of graphene's network structure on thermal conductivity is crucial for material design.
Purpose of the Study:
- To investigate how graphene network structure affects the thermal conductivity of graphene/polydimethylsiloxane (PDMS) composites.
- To elucidate the mechanisms governing heat transfer in these composites.
Main Methods:
- Utilized nonequilibrium molecular dynamics simulations.
- Analyzed graphene-graphene interfacial thermal resistance (ITR).
- Calculated graphene heat transfer ratio and simulated various defect densities.
Main Results:
- Thermal conductivity increases with graphene volume fraction and stacking area.
- Single vacancy defects initially increase conductivity then decrease it, while single void defects continuously increase it.
- Interlayer covalent bonds enhance heat transfer, and an empirical equation for ITR was derived.
Conclusions:
- Graphene network structure significantly impacts the thermal conductivity of GE/PDMS composites.
- Defect type and density play a critical role in modulating heat transfer pathways.
- Optimizing graphene network structure is key to enhancing composite thermal performance.
