PPyNT/NR/NBR Composites with Excellent Microwave Absorbing Performance in X-Band

Area of Science:

• Materials Science
• Polymer Science
• Electromagnetics

Background:

• Growing demand for flexible microwave absorbing (MA) materials.
• Need for high-performance MA materials in the X-band frequency range.
• Limitations of existing MA materials in terms of flexibility, absorption efficiency, and thickness.

Purpose of the Study:

• To develop a novel flexible MA rubber composite.
• To optimize the microwave absorbing performance using polypyrrole nanotubes (PPyNT) in natural rubber (NR) and acrylonitrile-butadiene rubber (NBR) blends.
• To investigate the effect of PPyNT content and NR/NBR blend ratio on MA properties.

Main Methods:

• Fabrication of MA rubber composites using NR and NBR blends.
• Incorporation of homemade polypyrrole nanotubes (PPyNT) as the absorbing filler.
• Systematic adjustment of PPyNT content and NR/NBR blend ratios.
• Evaluation of MA performance, including reflection loss and effective bandwidth, in the X-band.

Main Results:

• The NR/NBR (90/10) composite with 6 phr PPyNT exhibited superior MA performance.
• Achieved a minimum reflection loss of -56.67 dB.
• Obtained an effective absorption bandwidth of 3.7 GHz at a thickness of 2.9 mm.
• Demonstrated strong absorption and a wide effective absorption band with low filler content and thickness.

Conclusions:

• The developed PPyNT-filled NR/NBR composite is a promising flexible microwave absorbing material.
• The study provides valuable insights into designing high-performance flexible MA materials.
• Optimized filler content and polymer blend ratios are crucial for achieving desired MA properties.