Electromagnetic shielding effectiveness of polycarbonate/graphene nanocomposite foams processed in 2-steps with supercritical carbon dioxide

Cita com:
hdl:2117/80297
Document typeArticle
Defense date2015
Rights accessOpen Access
Abstract
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.
CitationGedler, 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.
ISSN0167-577X
Publisher versionhttp://www.sciencedirect.com/science/article/pii/S0167577X1530269X
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EM SE of PC-GnP ... with sc-CO2 (in press).pdf | 1,574Mb | View/Open |
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