This paper discusses the feasibility of the application of conductive immis
cible polymer blends as sensor materials for detection of organic liquid so
lvents. Immiscible polymer blends of polypropylene (PP), nylon 6 (Ny6) and
carbon black (CB) have been used to produce a series of electrically conduc
tive filaments by a capillary rheometer process. In these immiscible blends
, PP serves as a semi-crystalline matrix and Ny6 as the semi-crystalline di
spersed phase, The enhancement of conductivity in these blends is due to th
e attraction of CB to Ny6 and localization of CB particles at the PP/Ny6 in
terface, giving rise to conductive networks, The de electrical resistivity
of extruded filaments, produced at different shear levels, is found to be s
ensitive to various organic liquid solvents. The shear rate at which the fi
laments are produced has an important effect on the PP/Ny6/CB filament's se
nsitivity. The compositions studied were close to the double-percolation st
ructure believed to perform best as sensor materials. In addition, it seems
that the PP/Ny6 interface plays a major role in the sensing process. Liqui
d contact/drying cycling of the filaments indicates stabilization of the se
nsitivity change making the sensing process reversible.