Anisotropic Thermally Conductive Polymers for Flexible Heat Dissipation
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Solution Overview
Problem
Conventional thermally conductive materials are limited by low thermal conductivity, brittleness, and mechanical inflexibility, with a maximum operating temperature of 200°C, and existing methods to enhance thermal conductivity are inefficient or size-limited.
Innovation Solution
Anisotropic thermally conductive polymers with dynamic molecular weight are achieved by aligning crystalline domains using electrical fields, incorporating triggerable reactive end groups and coupling agents, allowing for high thermal conductivity in specific directions and dimensions, and enabling flexible, high-temperature operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional thermally conductive materials are used, then thermal conductivity is limited to low values, but material brittleness and mechanical inflexibility are avoided
Solution Approach 1:
The patent creates a composite material system consisting of thermally conductive filler particles (such as aluminum nitride, boron nitride, or silicon carbide) dispersed within a polymer matrix. This composite structure combines the high thermal conductivity of ceramic fillers with the mechanical flexibility and toughness of the polymer binder, resolving the contradiction between thermal performance and mechanical properties. The polymer matrix acts as a flexible binder that holds the rigid thermal conductive particles together, enabling both high thermal conductivity and mechanical flexibility simultaneously.
2Temperature
If filled composites are used to enhance thermal conductivity, then thermal conductivity improves, but brittleness increases and mechanical flexibility is lost
Solution Approach 1:
The patent employs parameter changes by carefully controlling the volume fraction, size distribution, and morphology of the thermal conductive filler particles within the polymer matrix. By optimizing these parameters, the composite achieves high thermal conductivity while maintaining adequate mechanical flexibility. The polymer content and filler particle characteristics are tuned to balance thermal performance with mechanical properties, preventing excessive brittleness.
3Use of energy by moving object
If maximum operating temperature is limited to 200°C, then energy density is constrained, but material stability is maintained
Solution Approach 1:
The patent utilizes parameter changes by selecting polymer matrices and filler materials with appropriate thermal stability characteristics that enable operation at elevated temperatures. The composite formulation is designed to maintain structural integrity and thermal conductivity at temperatures exceeding 200°C, allowing higher energy density applications in electronics and batteries while preserving material stability through careful material selection and composition optimization.
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 polymers exhibit enhanced thermal conductivity, up to four times that of steel, with reduced thermal expansion and mechanical flexibility, facilitating efficient heat removal in electronics and batteries.
Implementation Method 1
exposing the thermotropic liquid-crystal oligomer to an electrical field between a first anode and a first cathode, thereby generated an aligned oligomer with at least some of the polarizable domains aligned along a crystal axis
Implementation Method 2
the first thermotropic liquid-crystal oligomer molecules are polarizable
Implementation Method 3
applying a reactive end-group trigger to induce reactive bonding of the first triggerable reactive end groups
Implementation Method 4
The polymers exhibit enhanced thermal conductivity, up to four times that of steel
Data Source
AI summary
Some variations provide an oligomer composition comprising: polarizable first thermotropic liquid-crystal oligomer molecules (preferably urethanes or ureas) containing first triggerable reactive end groups, wherein the first triggerable reactive end groups are selected from the group consisting of hydroxyl, isocyanate, blocked isocyanate, acrylate, epoxide, amine, vinyl, ester, thiol, conjugated diene, substituted alkene, furan, maleimide, anthracene, and combinations thereof, and wherein the polarizable first thermotropic liquid-crystal oligomer molecules are characterized by a weight-average molecular weight from about 200 g/mol to about 10,000 g/mol; optionally, a plurality of polarizable second thermotropic liquid-crystal oligomer molecules containing second triggerable reactive end groups, wherein the second triggerable reactive end groups are capable of reacting with the first triggerable reactive end groups; and optionally, a reactive coupling agent capable of reacting with the first triggerable reactive end groups. Methods are described for converting the oligomer composition into an anisotropic thermally conductive polymer. Many commercial uses are disclosed.