Effects of Carbon Nanotubes/Graphene Nanoplatelets Hybrid Systems on the Structure and Properties of Polyetherimide-Based Foams

被引:52
作者
Abbasi, Hooman [1 ]
Antunes, Marcelo [1 ]
Ignacio Velasco, Jose [1 ]
机构
[1] Univ Politecn Catalunya UPC BarcelonaTech, Ctr Catala Plast, Dept Ciencia Mat & Engn Met, C Colom 114, E-08222 Barcelona, Spain
关键词
nanocomposites; graphene; carbon nanotubes; hybrid nanoparticles; polyetherimide foams; electrical conductivity; percolation; ultrasonication; INTERFERENCE SHIELDING EFFECTIVENESS; DYNAMIC-MECHANICAL ANALYSIS; LITHIUM-ION BATTERIES; GRAPHENE NANOPLATELETS; NANOCOMPOSITE FOAMS; ELECTRICAL-CONDUCTIVITY; COMPOSITE FOAMS; POLYMER FOAMS; THERMOMECHANICAL PROPERTIES; TRANSPARENT CONDUCTORS;
D O I
10.3390/polym10040348
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Foams based on polyetherimide (PEI) with carbon nanotubes (CNT) and PEI with graphene nanoplatelets (GnP) combined with CNT were prepared by water vapor induced phase separation. Prior to foaming, variable amounts of only CNT (0.1-2.0 wt %) or a combination of GnP (0.0-2.0 wt %) and CNT (0.0-2.0 wt %) for a total amount of CNT-GnP of 2.0 wt %, were dispersed in a solvent using high power sonication, added to the PEI solution, and intensively mixed. While the addition of increasingly higher amounts of only CNT led to foams with more heterogeneous cellular structures, the incorporation of GnP resulted in foams with finer and more homogeneous cellular structures. GnP in combination with CNT effectively enhanced the thermal stability of foams by delaying thermal decomposition and mechanically-reinforced PEI. The addition of 1.0 wt % GnP in combination with 1.0 wt % CNT resulted in foams with extremely high electrical conductivity, which was related to the formation of an optimum conductive network by physical contact between GnP layers and CNT, enabling their use in electrostatic discharge (ESD) and electromagnetic interference (EMI) shielding applications. The experimental electrical conductivity values of foams containing only CNT fitted well to a percolative conduction model, with a percolation threshold of 0.06 vol % (0.1 wt %) CNT.
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页数:22
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