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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites

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"Snakeskin" Bioinspired Design for Polymer Composite with Enhanced Positive Temperature-Dependent Thermal

Yu Jia^1,2, Zepeng Mao^1,2, Han Zhang^1,2

¹Department of Polymer Science and Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China.

|January 9, 2025

Summary

This study introduces a bioinspired snakeskin-like structure for polymer composites, significantly improving thermal conductivity and its temperature dependence. This novel approach enhances thermal management in materials.

Keywords:

Bioinspired design polymer composites segregated structure temperature dependence of thermal conductivity thermal management

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Published on: January 8, 2016

Area of Science:

Materials Science
Polymer Science
Nanotechnology

Background:

Thermally conductive polymer composites face challenges with negative temperature dependence of thermal conductivity (TDTC).
This TDTC is often caused by interfacial voids due to mismatched thermal expansion between polymers and fillers.
Existing methods struggle to effectively manage thermal expansion and maintain conductivity.

Purpose of the Study:

To design a bioinspired segregated structure mimicking snakeskin to enhance thermal conductivity (TC) and TDTC in polymer composites.
To investigate the role of a copper alloy coating in restricting thermal expansion and forming a pseudoconductive network.
To develop a scalable and effective strategy for advanced thermal management materials.

Main Methods:

A segregated structure was designed by coating a high-impact polystyrene (HIPS)/graphite (Gt) composite with a copper alloy.
The hierarchical structure was inspired by the scales and intergap of snakeskin.
Thermal conductivity and temperature dependence were measured between -20 and 80 °C.

Main Results:

The bioinspired structure significantly increased TDTC by 290% compared to conventional composites.
Thermal conductivity (TC) at 80 °C was enhanced by 46.5% with the new structure.
The copper alloy coating effectively restricted thermal expansion and formed a pseudoconductive network.

Conclusions:

The bioinspired snakeskin-like structure offers a straightforward and scalable method for enhancing thermal management in polymer composites.
This approach effectively addresses the challenge of negative TDTC by managing interfacial thermal expansion.
The study presents a novel strategy for designing high-performance thermal management materials.