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Manipulating the conductivity of carbon‐black‐filled immiscible polymer composites by insulating nanoparticles
Author(s) -
Li Bo,
Xu XiangBin,
Li ZhongMing,
Song YinChun
Publication year - 2008
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.28573
Subject(s) - materials science , carbon black , composite material , electrical resistivity and conductivity , nanoparticle , percolation (cognitive psychology) , nanocomposite , composite number , conductivity , electrical conductor , percolation threshold , polymer , polyethylene , filler (materials) , polyethylene terephthalate , nanotechnology , chemistry , natural rubber , neuroscience , electrical engineering , biology , engineering
The conductivity of an immiscible polymer blend system, microfibrillar conductive poly(ethylene terephthalate) (PET)/polyethylene (PE) composite (MCPC) containing carbon black (CB), was changed by the addition of insulating CaCO 3 nanoparticles. In MCPC, the PET forms microfibrils during processing and PE forms the matrix. The CB particles are selectively localized in the PET microfibrils. When the insulating CaCO 3 nanoparticles are added, they substitute for some of the conductive CB particles and obstruct the electron paths. As a result, the resistivity of the MCPC can be tailored depending on the insulating filler content. The resistivity‐insulating filler content curve displays a sluggish postpercolation region (the region immediately following the percolation region and in front of the equilibrium flat of the resistivity‐filler content curve), suggesting that the MCPC in the postpercolation region possesses an enhanced manufacturing reproducibility and a widened processing window. These features are of crucial importance in making sensor materials. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008.