Enhanced electromagnetic interference shielding effectiveness of polycarbonate/graphene nanocomposites foamed via 1-step supercritical carbon dioxide process. (15th January 2016)

• Record Type: Journal Article
• Authors: Gedler, G.; Antunes, M.; Velasco, J.I.; Ozisik, R.
• Is Part Of: Materials & design. Volume 90(2016)
• Page Start: 906
• Page End: 914
• Publication Date: 2016-01-15
• Subjects: Composite foams -- Graphene -- Polycarbonate -- Electromagnetic interference shielding -- Small angle X-ray scattering -- 1-Step foaming; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2015.11.021
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: The dielectric and electromagnetic interference (EMI) shielding properties of polycarbonate/graphene nanocomposites foamed using supercritical carbon dioxide were studied as a function of their cellular and composite morphology. Foamed polycarbonate filled with 0.5% (by weight) graphene exhibited enhanced EMI shielding effectiveness, which was found to depend on cellular and composite morphology in a complex manner. Foamed composites presented a maximum specific EMI shielding effectiveness of ~ 39 dB cm 3 /g, which is approximately 35 times greater than that of unfoamed composite (1.1 dB cm 3 /g). In addition, the relative permittivity was found to increase up to 3.25 times. The results suggest that graphene filled polymer foams can enhance the performance of electronic devices, opening up the possibility of using these materials in electronic applications. Graphical abstract: Highlights: Foaming promoted better graphene dispersion/distribution and hence, better EMI shielding. Shielding effectiveness increased ~ 15 times after foaming. Maximum specific shielding effectiveness of foamed composites was 39 dB cm 3 /g, 4 × that of copper. Relative permittivity of PC improved upon foaming and the addition of graphene. All EMI shielding mechanism contributed in a similar fashion.