Related Experiment Video
Updated: Aug 30, 2025
06:34
Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
Published on: September 19, 2020
5.9K
A Comparative Study on Bio-Based PU Foam Reinforced with Nanoparticles for EMI-Shielding Applications
Vinoth Kumar Selvaraj1, Jeyanthi Subramanian1
1School of Mechanical Engineering, Vellore Institute of Technology, Chennai 600127, Tamil Nadu, India.
Polymers
|August 26, 2022
Summary
This study developed a renewable, bio-based polyurethane foam using castor oil for electromagnetic interference (EMI) shielding. The material achieved a maximum EMI shielding effectiveness of 28.03 dB, offering a sustainable solution for various applications.
Area of Science:
- Materials Science
- Nanotechnology
- Polymer Chemistry
Background:
- Polyurethane (PU) foams are typically derived from petrochemicals, raising environmental concerns.
- Castor oil (CO) offers a renewable alternative for producing bio-based materials.
- There is a growing need for lightweight, effective electromagnetic interference (EMI) shielding materials.
Purpose of the Study:
- To fabricate a flexible, low-density, bio-based polyurethane foam for EMI shielding applications.
- To incorporate nanoparticles, including graphite nanoplates (GNP), zirconium oxide (ZrO2), and bamboo charcoal (BC), into the bio-based foam matrix.
- To evaluate the EMI shielding performance of the developed material and optimize its composition.
Main Methods:
- Bio-based polyurethane foam was synthesized using castor oil and a mechanical stirrer.
- Nanoparticles (GNP, ZrO2, BC) were integrated into the foam via absorption and hydrothermal reduction.
- Electromagnetic interference shielding effectiveness (EMI SE) was measured using an N5230A PNA-L test setup.
- Experimental results were validated against computational simulations (COMSOL Multiphysics 5.4) and response surface methodology.
Main Results:
- A specific composition of 0.3 wt% GNP, 0.3 wt% ZrO2, and 2.5 wt% BC yielded the highest EMI shielding effectiveness.
- The optimized material achieved a maximum EMI SE of 28.03 dB within the 8-12 GHz frequency band.
- The study demonstrated a systematic approach using statistical experimental design for optimization.
Conclusions:
- Castor oil-based polyurethane foam incorporating specific nanoparticles presents a viable, eco-friendly alternative for EMI shielding.
- The developed material shows promise for applications in communication, aerospace, electronics, and military sectors.
- The combination of experimental testing, simulation, and optimization provides a robust framework for material development.
