CNT Thermoplastic Composite for Low-Loading EMI Attenuation
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Solution Overview
Problem
Existing EMI shielding composites require high concentrations of conductive additives, which complicates processing and affects the mechanical properties of thermoplastic polymers, making them less industrially feasible.
Innovation Solution
A composite material with a polymeric matrix containing 0.00001 to 5% carbon nanotubes (CNTs) and a surfactant, ensuring homogeneous distribution, which maintains mechanical properties and provides electromagnetic radiation attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If high concentration of conductive additives is used to achieve EMI shielding, then electromagnetic radiation attenuation is improved, but processing complexity and manufacturing difficulty increase
Solution Approach 1:
The patent changes the concentration parameter of conductive additives from high (conventional) to low (0.01-5 wt%), and compensates by optimizing distribution homogeneity through surfactant selection and processing conditions, thereby reducing processing complexity while maintaining EMI shielding effectiveness
Solution Approach 2:
The patent introduces surfactants as intermediary substances to mediate between the conductive additives and polymer matrix, improving dispersion homogeneity and enabling effective EMI shielding at lower additive concentrations, which simplifies processing
2Object-affected harmful factors
If high concentration of conductive additives is used to achieve EMI shielding, then electromagnetic radiation attenuation is improved, but mechanical properties of thermoplastic polymer deteriorate
Solution Approach 1:
The patent changes the concentration parameter from high to low (0.01-5 wt%), and maintains mechanical properties by ensuring homogeneous distribution through surfactant assistance, thereby achieving both EMI shielding and preservation of mechanical strength
Solution Approach 2:
Surfactants act as intermediaries that improve the interface between conductive additives and polymer matrix, preventing agglomeration and stress concentration, thus maintaining mechanical properties at low additive concentrations
3Object-affected harmful factors
If high concentration of conductive additives is used to achieve EMI shielding, then electromagnetic radiation attenuation is improved, but cost effectiveness decreases
Solution Approach 1:
The patent changes the concentration parameter to low levels (0.01-5 wt%), reducing the quantity of expensive conductive additives required, and achieves cost effectiveness by optimizing distribution through surfactant selection and conventional processing
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 material achieves effective electromagnetic interference attenuation with reduced CNT content, maintaining mechanical properties and being processable through conventional methods like extrusion and molding.
Implementation Method 1
the article is configured for attenuation of an electromagnetic radiation at a wavelength range of between 1 kHz and 150 GHz
Data Source
AI summary
An article comprising a wall, wherein the wall comprises a composition a polymeric matrix and a plurality of CNTs homogenously dispersed within said polymeric matrix is provided, wherein the polymeric matrix comprises a thermoplastic polymer in a form of a three-dimensional interconnecting network; a weight portion of the CNT relative to the polymeric matrix is between 0.00001 and 5%; and the polymeric matrix further comprises a surfactant. Further, the article of the invention is configured for attenuation of electromagnetic radiation.