Speaker
Description
The increasing number of wireless devices and sensitive electronics in modern smart
buildings requires strong protection against electromagnetic interference (EMI).
Traditional metallic shields are often too heavy and vulnerable to corrosive
degradation. Polymer composites reinforced with conductive nanomaterials, such as
graphene, offer a superior alternative due to their high electrical conductivity,
mechanical flexibility, and low density. This study investigates the critical dependence
of EMI shielding effectiveness (SE) on both the selection of the polymer matrix
(polyvinyl chloride, PVC, and poly(methyl methacrylate), PMMA) and the specific
graphene loading concentration (0.3 wt. % and 1.0 wt. %). The resulting composite
films were thoroughly characterized using Raman spectroscopy, Thermogravimetric
Analysis/Differential Scanning Calorimetry (TGA/DSC), X-Ray Diffraction (XRD),
Transmission Electron Microscopy (TEM), and dielectric measurements. These
structural and electrical analyses were performed to establish the precise relationship
between the composite's microstructure (including graphene ratio and dispersion), its
thermal stability, and the formation of a critical conductive network necessary for
effective EMI shielding. Key findings indicate that PMMA/G nanocomposites exhibit
a significantly higher mass residue (75 %) compared to PVC/G (10 %), which is
crucial for maintaining a conductive network and structural integrity under high
temperatures. The obtained data provide essential insights into the optimal design
parameters for engineering effective, scalable polymer-graphene shields.
Keywords: Graphene, PVC, PMMA, Composite, Films, EMI Shielding
