Poly(ionic liquid)s: A Promising Matrix for Thermal Interface Materials

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Advancements in high-density chiplet packaging, driven by AI, necessitate improved thermal management solutions.
• Current silicone-based thermal interface materials (TIMs) exhibit limitations in thermal resistance, adhesion, and mechanical flexibility, hindering reliability in demanding applications.

Purpose of the Study:

• To introduce poly(ionic liquid)s (PILs) as a novel matrix for high-performance TIMs.
• To evaluate the properties of PIL-based TIMs for enhanced thermal management in chip-scale packaging.

Main Methods:

• Synthesis and characterization of poly(ionic liquid)s (PILs) as a TIM matrix.
• Formulation of a PIL-based TIM by blending with liquid metal.
• Performance evaluation of the PIL-based TIM in encapsulated structures, including adhesion, flexibility, and thermal conductivity testing.

Main Results:

• PILs exhibit a low elastic modulus (60 kPa), exceptional stretchability (>3800%), and high adhesion (up to 4.10 MPa).
• PIL-based TIMs demonstrate excellent self-healing, recyclability, and filler compatibility.
• The developed PIL-based TIM shows high elongation at break (>350%), sustained adhesion (1.70 MPa), and favorable thermal conductivity in package testing.

Conclusions:

• Poly(ionic liquid)s present a promising alternative matrix for advanced TIMs, surpassing the performance limitations of traditional silicone systems.
• PIL-based TIMs offer significant performance benefits, including enhanced reliability and thermal management for next-generation electronic devices.
• This research paves the way for broader applications of PILs in thermal management and the development of next-generation TIMs.