Flexible Electrothermal Composite Using Carbon Nanotube Networks
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Solution Overview
Problem
Existing electrothermal materials, typically made of metals, lack flexibility and high mechanical strength, making them unsuitable for applications requiring both high resistance and adaptability, such as seat warmers and immersion suits, while polymer-based composites with conductive particles compromise on mechanical strength for conductivity.
Innovation Solution
A flexible electrothermal composite comprising a polymer matrix with dispersed carbon nanotubes forming conductive networks, which provides high flexibility, resistance, and strength by optimizing the percentage and length of carbon nanotubes within the matrix.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal is used as electrothermal material, then conductivity is improved, but flexibility and adaptability deteriorate
Solution Approach 1:
The patent uses a composite structure combining polymer matrix with carbon nanotube networks. The polymer provides flexibility while carbon nanotubes provide conductivity, resolving the contradiction between metal conductivity and polymer flexibility through material composition rather than single-material selection.
2Reliability
If a large amount of conductive particles are added to polymer composite, then conductivity is improved, but mechanical strength deteriorates
Solution Approach 1:
The patent changes the parameter of conductive particle morphology from conventional metal powder/graphite powder to carbon nanotubes. This parameter change allows achieving adequate conductivity with much lower particle concentration (0.1-4 wt%), thereby preserving mechanical strength while maintaining electrical conductivity.
Solution Approach 2:
The patent creates a composite where carbon nanotubes form conductive networks within the polymer matrix. This composite structure achieves conductivity enhancement without the need for high particle loading that would compromise mechanical properties.
3Reliability
If a large amount of conductive particles are added to polymer composite, then conductivity is improved, but lifetime deteriorates
Solution Approach 1:
The patent changes the conductive particle parameter to carbon nanotubes with high aspect ratio and superior chemical stability. This parameter change enables forming conductive networks at low concentrations, reducing particle-particle interactions that lead to aggregation and degradation, thereby extending material lifetime.
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 composite achieves suitable conductivity for low-temperature heating applications with improved mechanical strength and flexibility, reducing power consumption and toxicity, making it suitable for human-contact heating devices.
Implementation Method 1
Electrothermal materials can generate heat when a voltage is applied thereto
Implementation Method 2
the carbon nanotubes forming a number of conductive networks in the polymer matrix
Data Source
AI summary
The present invention relates to a flexible electrothermal composite. In one embodiment, a flexible electrothermal composite includes a flexible polymer matrix and a number of carbon nanotubes dispersed in the matrix, the carbon nanotubes forming a plurality of conductive network in the polymer. The flexible electrothermal composite has high flexibility, resistance and intensity.