A Highly Flexible Electromagnetic Interface Shielding Nanocomposite Film by Using Graphene Nano Plate and Self-doped Conductive Polymeric Surfactant
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In mechanically flexible electromagnetic interference (EMI) shielding applications, polymer-graphene nanocomposite has recently emerged as a promising candidate. In this study, conjugated polyelectrolytes (CPEs) were introduced as surfactants for improving the dispersibility of graphene nanoplate (GNP) in processing solvent and polymer matrix, and the structural, mechanical, and electrical properties of corresponding polyurethane (PU)-GNP nanocomposites were investigated. It was observed that the prepared nanocomposites have a two-dimensionally well-aligned layer-by-layer structure between GNP and PU polymer. Furthermore, we found that the CPE with CH3NH3+ counter ion provided improved mechanical and electrical properties of nanocomposites compared to the CPEs with Na+ when the counter ions of CPEs were varied for preparing GNP- polyurethane nanocomposites. We would attribute this to the different interactions between the ionic groups of CPE surfactants and polyurethane polymer matrix. Also, we achieved a high-performance EMI composite with improved mechanical and folding abilities.