Thermally Conductive Silicone Composition with Silane-Modified Binder
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Solution Overview
Problem
Conventional thermally conductive silicone compositions require high concentrations of inorganic fillers to enhance thermal conductivity, leading to reduced fluidity and elastomeric properties, which affects the moldability and long-term reliability of thermal interface materials.
Innovation Solution
A thermally conducting silicone composition comprising an arylene ether functionalized organosiloxane polymer that exhibits excellent dispersibility with both oxide and non-oxide fillers, improving thermal conductivity and mechanical properties at lower filler concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high concentration of inorganic fillers is used to improve thermal conductivity, then thermal conductivity is improved, but fluidity is reduced
Solution Approach 1:
The patent introduces a silane-modified polysiloxane binder as an intermediary substance between the inorganic fillers and the base polymer matrix. This modified binder contains reactive silane groups that form strong chemical bonds with filler surfaces, creating a compatible interface that allows for higher filler loading while maintaining adequate fluidity and processability of the thermal interface material composition.
Solution Approach 2:
The patent employs a composite binder system consisting of silane-modified polysiloxane combined with unmodified polysiloxane. This composite approach leverages the enhanced filler interaction capabilities of the silane-modified portion while maintaining the base polymer's bulk properties, enabling the formulation to accommodate high filler concentrations without sacrificing fluidity or thermal conductivity performance.
2Temperature
If high concentration of inorganic fillers is used to improve thermal conductivity, then thermal conductivity is improved, but elastomeric property is reduced
Solution Approach 1:
The silane-modified polysiloxane acts as a mediator that forms strong chemical bonds with inorganic filler surfaces through silane coupling. This creates a robust filler-binder interface that effectively transfers and distributes mechanical stresses, thereby maintaining elastomeric properties and structural integrity even at high filler loadings where the continuous polymer matrix is significantly reduced.
Solution Approach 2:
The patent applies local quality enhancement by concentrating the silane modification specifically at the filler-binder interface regions. This localized chemical modification creates strong bonding zones around filler particles without requiring modification of the entire polymer matrix, thereby preserving bulk elastomeric properties while enabling high filler content to be accommodated with maintained mechanical performance.
3Temperature
If high concentration of inorganic fillers is used to improve thermal conductivity, then thermal conductivity is improved, but moldability is reduced
Solution Approach 1:
The silane-modified polysiloxane binder serves as an intermediary that provides both chemical adhesion to fillers and adequate lubricity for processing. The modification creates a surface-active binder layer that reduces inter-particle friction and improves flow characteristics during molding operations, enabling high filler content formulations to maintain sufficient moldability and fill capability for complex thermal interface structures.
4Temperature
If high concentration of inorganic fillers is used to improve thermal conductivity, then thermal conductivity is improved, but long-term reliability is reduced
Solution Approach 1:
The silane-modified polysiloxane creates a chemically bonded interface between fillers and the polymer matrix that resists degradation over time. This strong chemical bonding prevents filler particle detachment, aggregation, and interface failure under thermal cycling and mechanical stress, thereby significantly improving the long-term reliability and durability of high-filler-content thermal interface materials compared to physically-bound systems.
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
The composition achieves enhanced thermal conductivity and mechanical properties with improved filler dispersibility, maintaining fluidity and reliability, thus addressing the limitations of conventional compositions.
Implementation Method 1
The organosiloxane copolymer used in the silicone composition exhibited excellent dispersibility for both oxide and non-oxide thermal fillers enabling enhanced thermal conductivity of the compositions
Implementation Method 2
various thermally conductive silicone compositions have been employed over the years... to dissipate heat effectively from the electronic components
Data Source
AI summary
Provided is a polymer of the formula:and compositions comprising the same. The polymers comprise a cyclic unsaturated group (Z3) within the siloxane polymer backbone. The polymers have been found to exhibit good thermal conductivity and may find utility in a variety of applications.