Polyurethane conductive filler composites (PUF/conductive filler composites) have emerged as a notable solution for electromagnetic interference shielding (EMI SE). They display exceptional properties primarily due to their enhanced electrical conductivity and unique structural characteristics.
Optimal Conductive Fillers
- NCCF as the Most Effective Single Filler: Among single conductive fillers like nickel-coated carbon fiber (NCCF), multiwall carbon nanotube (MWCNT), and graphite, NCCF showcases the highest electrical conductivity and EMI SE.
- Superior Hybrid Composite: The combination of NCCF (3.0 php) and MWCNT (3.0 php) forms a composite that outperforms others. Its electrical conductivity is 0.171 S/cm, and EMI SE is 24.7 dB. This translates to roughly 95% EMI shielding capability.
Application and Benefits
These composites are highly effective for applications requiring EMI shielding and thermal insulation, making them ideal for electronic packaging, aerospace, and automotive industries. The balance between electrical conductivity, EMI SE, and thermal insulation properties is crucial for these applications.
Key Benefits
- High EMI Shielding Effectiveness: It can shield up to 95% of EMI, which is crucial for protecting sensitive electronic components.
- Enhanced Thermal Insulation: The structure of the composites offers reduced thermal conductivity, which is suitable for insulation needs.
- Efficiency at Low Filler Content: Significant EMI SE and electrical conductivity are achieved with relatively low filler content, ensuring lightweight and cost-effectiveness.
- Synergistic Effects in Hybrid Composites: Combining different fillers, like NCCF and MWCNT, enhances properties beyond those possible with single fillers alone.
- Versatile Applications: These composites’ unique properties make them suitable for many industries where EMI shielding and thermal management are essential.
Why Use Polyurethane Conductive Foam Filler Composites?
Polyurethane foam–conductive filler composites present a promising approach to EMI shielding, especially for applications that benefit from their combination of electrical conductivity, EMI shielding effectiveness, and thermal insulation. The careful selection of filler content and type allows for tailored properties to meet specific needs, underscoring their versatility and effectiveness in various industrial applications.