In this paper, we report the preparation and characterization of composites
of polypyrrole (PPy) with polyvinylidene fluoride (PVDF), and cellulose. W
e used the techniques of chemical and electrochemical polymerization. These
materials were characterized using X-ray diffraction (wide and small angle
(SAXS)), electrical conductivity and electron microscopy. The studies show
ed that homogeneous composites could be formed. The percentage crystallinit
y of the host polymer decreased, whereas some crystallization of PPy was no
ticed. SAXS studies revealed that the diffusion of PPy is in amorphous regi
ons. The electrical conductivity of the composites was found to vary in the
range of 10(-8) S/cm to 10(-4) S/cm. These composites were found to be use
ful in gas sensors for detection of chlorine and ammonia.