IEEE Transactions on Components and Packaging Technologies · 2000 · 44 citations · 5 references
EngineeringMechanical EngineeringPolymer NanocompositesThermoplastic CompositePolymer Matrix CompositesConducting PolymerPolymer MaterialPolymer CompositesPolymer ChemistryMaterials SciencePtc BehaviorPolymer MeltFiber-reinforced CompositeConductive Polymer CompositesPolymer ScienceApplied PhysicsHigh Density PolyethyleneCarbon BlackPolymer PropertyPositive Temperature CoefficientMacroscopic Thermal Expansion
Conductive polymer composites showing large positive temperature coefficient (PTC) are made of semi-crystalline polymer as an insulator and a conducting filler, whose concentration is close to the critical volume fraction. In this study, the resistivity and PTC behavior of high density polyethylene (HDPE) filled with different carbon blacks were studied. Among those composites, N660 carbon black filled PE showed the greatest PTC behavior. Carbon black with large particle size, small surface area and small amount of aggregated structure leads to large amplitude of PTC transition (defined as the ratio of maximum resistivity to the resistivity at 25/spl deg/C). The great PTC behavior is due to some microscopic mechanism under the macroscopic thermal expansion of polymer matrix during melting of polymer crystal.
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Carbon—Electrochemical and Physicochemical Properties
O.R. Brown · Electrochimica Acta · 1989 · 1.2K citations