Abstract
The effect of physical structure of matrix copolyester on the electrical conductivity of polypyrrole/copolyester composite films was investigated. The composite films were prepared by polymerizing pyrrole through vapor phase absorption onto the anion-containing copolyester films prepared from copolyester/phenol-TCE/FeCl 3 mixture. The conductivity of polypyrrole/copolyester composite films increased with the DMS content up to 10 mol%. However, it decreased with DMS content when DMS content was greater than 10 mol%. This phenomenon was interpreted according to the physical structure of the copolyester. From the observed and calculated T g data, we found that after 10 mol% inhomogeneous distribution of DMS groups became serious, which suggested that many DMS groups gathered together. This micro-phase separation will lengthen the average distance between DMS units which can act as reaction sites for pyrrole polymerization and consequently reduce the electrical conductivity of the PPy composite film. These phenomenon may be one of the important reasons for the conductivity variation in this composite system.
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