Enhanced electromagnetic interference shielding effectiveness of polycarbonate/graphene nanocomposites foamed via 1-step supercritical carbon dioxide process

被引：76
作者：
Gedler, G. [1 ,2 ]
Antunes, M. [1 ]
Velasco, J. I. [1 ]
Ozisik, R. [2 ,3 ]
机构：
[1] Univ Politecn Cataluna, BarcelonaTech UPC, Ctr Catala Plast, Dept Ciencia Mat & Engn Met, E-08222 Barcelona, Spain
[2] Rensselaer Polytech Inst, Dept Mat Sci & Engn, Troy, NY 12180 USA
[3] Rensselaer Polytech Inst, Rensselaer Nanotechnol Ctr, Troy, NY 12180 USA
来源：
MATERIALS & DESIGN | 2016年 / 90卷
基金：
美国国家科学基金会;
关键词：
Composite foams; Graphene; Polycarbonate; Electromagnetic interference shielding; Small angle X-ray scattering; 1-Step foaming; COMPOSITE FOAMS; LOW PERCOLATION; AC CONDUCTION; GRAPHENE; POLYSTYRENE; CO2; RELAXATIONS; NUCLEATION; GROWTH;
D O I：
10.1016/j.matdes.2015.11.021
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 similar to 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. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：906 / 914
页数：9
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