2026-04-19T19:17:46Zhttps://recercat.cat/oai/requestoai:recercat.cat:2117/802972026-01-30T07:23:14Zcom_2072_1033col_2072_452950
Electromagnetic shielding effectiveness of polycarbonate/graphene nanocomposite foams processed in 2-steps with supercritical carbon dioxide
Gedler, Gabriel
Antunes, Marcelo de Sousa Pais
Velasco Perero, José Ignacio
Ozisik, Rahmi
Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica
Universitat Politècnica de Catalunya. POLY2 - Polyfunctional polymeric materials
Àrees temàtiques de la UPC::Enginyeria dels materials
Porous materials
Polymeric composites
Graphene
Electron microscopy
Porous materials
Polymeric composites
Graphene
X-ray techniques
Electron microscopy
Materials porosos
Compostos polimèrics
Grafè
Microscòpia electrònica
Raigs X
The electromagnetic interference (EMI) shielding properties of polycarbonate/graphene composites foamed with supercritical carbon dioxide were investigated as a function of cellular morphology and graphene particle dispersion. The 2-step foaming method used was found to improve graphene dispersion and led to a different cellular structure compared to traditional 1-step foaming. Reflection was found to be the dominant EMI shielding mechanism and EMI shielding effectiveness was improved with large cell morphology that promoted isotropic/random orientation of graphene particles. A maximum EMI specific shielding effectiveness of 78 dB·cm3/g was achieved in foams, which was more than 70 times higher than that of the unfoamed polymer(1.1 dB·cm3/g). The study shows that by controlling foaming process conditions and nanoparticle characteristics, it is possible to improve multiple properties
while achieving lightweight materials suitable for various applications.
Peer Reviewed
Postprint (author's final draft)
2015
Article
Gedler, G., De Sousa Pais, M., Velasco J.I., Ozisik, R. Electromagnetic shielding effectiveness of polycarbonate/graphene nanocomposite foams processed in 2-steps with supercritical carbon dioxide. "Materials letters", 2015, vol. 160, p. 41-44.
0167-577X
https://hdl.handle.net/2117/80297
10.1016/j.matlet.2015.07.070
eng
http://www.sciencedirect.com/science/article/pii/S0167577X1530269X
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
Open Access
4 p.
application/pdf