Fabrication and electrical properties of carbon/ polyesterimide thick resistive films

Formulation of composite resistive pastes for fabrication of micro-heaters

“…Based on this first set of values, we decided that a 20% volume concentration in conductive filler was an adequate compromise between low resistivity and processability. Finally, we note the critical volume fraction for percolation is quite low < 4%, but wide critical fractions are found in the literature, even for graphite of low geometric anisotropy [4,5,7,10,12,13], which can be due to various processing factors such as aggregation, or even small debris [17].…”

“…Thermal cycling between 30 and 140°C of test resistors demonstrated that this final composite is more stable with temperature, although significant change is still observed in the 1 st cycle. Stability could be further improved by substituting part of the graphite with carbon black [12][13][14]. The presence of both fillers also in principle allows a lower resistivity at high loadings [7,13].…”

Polyesterimide composites as a sensor material for sliding bearings

“…When a conducting phase is dispersed in sufficient quantity in the polymer matrix, a conducting composite is formed. The theory of percolation has been used to determine the conducting filler volume fraction, which is necessary for obtaining the start point of the charge carrier transport through polymer composite, called the percolation threshold [7,19]. Resistance of PEI composites is proportional to the applied thermal or mechanical stress and strain and this phenomenon is called as 'piezoresistive effect'.…”

Carbon/polyesterimide thick-film resistive composites – Experimental characterization and theoretical analysis of physicochemical, electrical and stability properties

“…The high structure Ketjen Black EC-DJ 600 (specific surface area 1270 m 2 /g, 4.8 ml/g oil absorption, spherical shape with 6 nm mean diameter), SAKAP-6 medium structure conductive carbon black (specific surface area 200 m 2 /g, 1.2 ml/g oil absorption, spherical shape with 30-40 nm mean diameter) and flaky-shaped graphite (0.2-0.7 lm thickness and the other two dimensions of about one order larger) have been used as the active phase [7][8][9]. Polyesterimide resin dissolved in N-methyl-2-pyrrolidone and a suitable catalytic agent served as the remaining component of the inks.…”