Silsesquioxane-Modified Polymer EMI Shielding
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Solution Overview
Problem
Current EMI shielding technologies, particularly for high-frequency electromagnetic interference, often rely on reflective metal sheets, which may not be sufficient and can cause additional issues, necessitating the development of materials and methods for effective EM wave absorption in the 1-40 GHz or 1-100 GHz frequency range.
Innovation Solution
The use of electromagnetic interference (EMI) shielding articles composed of electrically conductive fillers, such as carbon nanostructure fillers, and silsesquioxane-like particles within a polymeric matrix material, where the silsesquioxane-like particles enhance EM energy absorption by introducing intrinsic porosity and reducing real part permittivity values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If reflective metal sheets are used for EMI shielding, then EMI reflection is improved, but EMI absorption is insufficient and additional problems are caused
Solution Approach 1:
The patent uses composite materials combining conductive fillers (carbon nanotubes, graphene, metal particles) with polymer matrices to create materials that simultaneously provide both reflection and absorption mechanisms for EMI shielding, resolving the contradiction between reflection effectiveness and absorption insufficiency
Solution Approach 2:
The patent incorporates porous structures within the composite material matrix to enhance electromagnetic wave absorption through multiple scattering and dissipation mechanisms, allowing the material to absorb EM energy while maintaining structural integrity and shielding effectiveness
2Reliability
If small amounts of SSQ-like particles are added to polymeric matrix, then EMI absorber performance is improved, but material complexity increases
Solution Approach 1:
The patent adds small, specific amounts of SSQ-like particles (silsesquioxane) at controlled concentrations within the polymer matrix to locally enhance dielectric properties and EM absorption without uniformly complicating the entire material system, achieving performance improvement with minimal complexity increase
Solution Approach 2:
The patent optimizes the concentration parameter of SSQ-like particles in the composite material to achieve peak EMI absorption performance, demonstrating how parameter adjustment can improve reliability while controlling complexity through precise formulation
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 introduction of small amounts of silsesquioxane-like particles in the polymeric matrix significantly improves EMI absorber performance, reducing real part permittivity values and enhancing electromagnetic energy absorption across the 0.1-40 GHz frequency range, leading to superior EMI shielding capabilities.
Implementation Method 1
the silsesquioxane-like particles are capable of increasing EM energy absorption of the composition by introducing intrinsic porosity and reducing real part permittivity values
Implementation Method 2
enhancing electromagnetic energy absorption across the 0.1-40 GHz frequency range
Data Source
AI summary
Electromagnetic interference (EMI) shielding articles and methods of producing and using the same are described. The articles include electrically conductive fillers and silsesquioxane-like (SSQ-like) particles distributed inside a polymeric matrix material. In some cases, adding the SSQ-like particles leads to increased porosity of the articles which improves EMI absorbing performance.