The effect of temperature on the resistivity of Sn-Pb alloy-loaded PS compo
sites was studied. The composites have distinctive positive temperature coe
fficient (PTC) effects with high PTC intensity, abrupt PTC transition, etc.
According to SEM and EDAX analyses, the morphology of the alloy particles
in the composites remained unchanged as the temperature reached the melting
point of the alloy, while the alloy dispersion changed. The viscosity of t
he composites decreased sharply when the alloy melted. (C) 2000 John Wiley
& Sons, Inc.