Rheological properties and percolation in suspensions of multiwalled carbon nanotubes in polycarbonate

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DOIResolve DOI: http://doi.org/10.1007/s00397-009-0375-7
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TypeArticle
Journal titleRheologica Acta
Volume48
Issue9
Pages943959; # of pages: 17
SubjectMultiwalled carbon nanotube; Polycarbonate; Suspension; Rheological percolation; Electrical percolation; Thermal conductivity percolation; Filled polymer; Storage modulus
AbstractThis paper is concerned with several issues related to the rheological behavior of polycarbonate/ multiwalled carbon nanotube nanocomposites. The composites were prepared by diluting a masterbatch of 15 wt.% nanotubes using melt-mixing method, and the dispersion was analyzed by SEM, TEM, and AFM techniques. To understand the percolated structure, the nanocomposites were characterized via a set of rheological, electrical, and thermal conductivity measurements. The rheological measurements revealed that the structure and properties were temperature dependent; the percolation threshold was significantly lower at higher temperature suggesting stronger nanotube interactions. The nanotube networks were also sensitive to the steady shear deformation particularly at high temperature. Following preshearing, the elastic modulus decreased markedly suggesting that the nanotubes became more rigid. These results were analyzed using simple models for suspensions of rod-like particles. Finally, the rheological, electrical, and thermal conductivity percolation thresholds were compared. As expected, the rheological threshold was smaller than the thermal and electrical threshold.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute
Peer reviewedYes
NRC number52448
NPARC number14968154
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Record identifier830a5c08-6d1b-479f-9042-a59eb8e5988a
Record created2010-04-14
Record modified2016-05-09
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