Thermal Interface Materials by Phase-Separated Domain Formation
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Solution Overview
Problem
Current thermal interface materials face challenges in achieving high thermal and electrical conductivity across microchips due to poor thermal conduction in processable materials and significant phonon scattering at interfaces, leading to inefficient thermal energy transport.
Innovation Solution
The development of thermal interface materials with phase-separated domains, utilizing metallic nanoparticles or aromatic carbon-based materials, polyfunctional surfactants, and reactive additives to form a crosslinked polymer network, which stabilizes and disperses these materials, enabling effective thermal conductivity through domain enrichment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conductive fillers (such as graphene or metal particles) are loaded into polymer adhesives to enable adhesive strength across an interface, then adhesive strength is improved, but thermal conductivity deteriorates due to phonon scattering at interfaces and poor thermal conduction in the polymer matrix
Solution Approach 1:
The material is segmented into distinct phases: a polymer adhesive phase and conductive filler-rich domains. This segmentation allows the polymer to provide adhesive strength while the conductive domains provide thermal conduction pathways, resolving the contradiction between adhesive strength and thermal conductivity
Solution Approach 2:
Different regions of the material have different properties: the polymer-rich regions provide adhesive strength and flexibility, while the conductive filler-rich domains provide thermal conductivity. This local differentiation allows each region to optimize its function without compromising the other
2Reliability
If regularly ordered atoms (such as crystalline domains) are used to enable effective thermal energy translation, then thermal conductivity is improved, but material processability deteriorates
Solution Approach 1:
The polymer matrix acts as an intermediary that enables processability while the conductive filler domains provide the ordered structures needed for thermal conduction. The polymer allows the material to be processed like conventional adhesives while the filler domains maintain thermal conductivity pathways
3Loss of energy
If void spaces are utilized to minimize thermal conduction and force thermal convection, then thermal insulation is improved, but thermal energy transport deteriorates
Solution Approach 1:
Instead of using void spaces to block thermal conduction, the invention uses conductive filler domains to create continuous pathways for thermal conduction. This inverts the conventional approach: rather than minimizing conduction through voids, the material maximizes conduction through organized filler networks while the polymer matrix provides structural continuity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances thermal conductivity by creating continuous channels within the material, improving thermal energy transport and adhesive strength across microchip interfaces, thereby addressing the limitations of existing materials.
Implementation Method 1
polymer resins to solubilize/disperse thermally conductive filler particles in the uncured resin
Implementation Method 2
during the cure, the resin phase separates from the thermally conductive filler particles to form domains of cured resin and separate domains of conductive filler
Implementation Method 3
the polyfunctional surfactant is capable of forming a polymer when reacted with the polyfunctional surfactant
Data Source
AI summary
Disclosed are thermal interface materials having phase separated domains and methods of preparing the same. Exemplary polymer resins solubilize/disperse thermally conductive filler particles in the uncured resin, and, during the cure, the resin may phase separate from the thermally conductive filler particles to form domains of cured resin and domains of conductive filler. Exemplary cured systems comprise: metallic nanoparticles or an aromatic carbon based material, a polyfunctional surfactant, and a crosslinked polymer network; wherein the cured system has domains enriched with the metallic nanoparticles or the aromatic carbon based material and domains enriched with the crosslinked polymer network, and wherein the polyfunctional surfactant is covalently bonded with the crosslinked polymer network. Exemplary methods for making a cured system comprise: applying a magnetic field to form domains enriched with the metallic nanoparticles and domains enriched with the crosslinked polymer network.