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Engineering Poly(ionic liquid) Composites for Silicone-Free Thermal Interface Materials: Enhanced Thermal
Zhaoyu Lin1, Xin Luo1, Jianhui Zeng2
1State Key Laboratory of Materials for Integrated Circuits, Shenzhen Institute of Advanced Electronic Materials, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.
ACS Applied Materials & Interfaces
|August 8, 2025
Summary
This study introduces a novel silicon-free thermal interface material (TIM) using poly(ionic liquid)s. This advanced TIM offers improved adhesion and thermal stability, addressing key limitations in electronic thermal management.
Area of Science:
- Materials Science
- Polymer Chemistry
- Nanotechnology
Background:
- Electronic device miniaturization and power density increase necessitate advanced thermal management solutions.
- Current silicone-based thermal interface materials (TIMs) exhibit limitations like poor interfacial adhesion and thermal degradation.
- Effective TIMs are crucial for reducing thermal resistance between electronic components and heat sinks.
Purpose of the Study:
- To develop a novel silicon-free TIM system based on poly(ionic liquid)s (PILs).
- To overcome the interfacial adhesion and thermal stability issues associated with traditional TIMs.
- To enhance the thermal conductivity and long-term reliability of TIMs for advanced electronics.
Main Methods:
- Synthesis and characterization of poly(1-dodecyl-3-vinylimidazolium) bis(trifluoromethylsulfonyl)imide (P[lm12V]TFSI).
- Investigation of interfacial adhesion properties with metal (Cu) and semiconductor (Si) substrates.
- Incorporation of silver particles using a dual-particle filler strategy to enhance thermal conductivity.
- Evaluation of thermal stability through decomposition temperature analysis and assessment of self-healing and recyclability.
Main Results:
- P[lm12V]TFSI demonstrated strong interfacial adhesion (5.52 MPa for Cu, 3.92 MPa for Si) and high thermal stability (280 °C decomposition).
- The P[lm12V]TFSI/Ag composite achieved a thermal conductivity of 17.2 W/m·K at 80 vol% Ag loading.
- The composite maintained robust interfacial adhesion (1.19 MPa on Si, 1.26 MPa on Cu) and exhibited reversible ionic bonding for self-healing and recyclability.
Conclusions:
- The developed silicon-free PIL-based TIM system effectively addresses limitations of conventional TIMs.
- The material shows exceptional interfacial compliance, thermal conductivity, and processing durability.
- This novel TIM presents a disruptive solution for critical thermal management challenges in modern electronics.
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