Poly AsFg doped conductivity

Much better stability was reported for AsFg-doped polyacetylene coated with poly(p-xylylene) (26), which is an excellent barrier toward oxygen and water. Samples having conductivities of 260 S/cm were coated by vacuum deposition thus, the initial concentration of oxygen in the sample was low. After 24 h in air, a conductivity loss of 10% was observed for treated films, whereas the conductivity of uncoated control samples decreased by a factor of 3. After 1 month, the coated samples had a conductivity of 150 S/cm, whereas that of the control was only 11 S/cm. From isothermal aging studies, the poly(p-xylylene) coating was found to increase the first-order activation energy for conductivity loss by 2.4 Kcal/mol, from 17.2 to 14.8. These data... 

We have synthesized such a precursor polymer by using the Stetter reaction (scheme 2). Poly-1,4-phenylene-1, 4 -butanedione 9 was formed in the reaction of terephthalic-dicarboxaldehyde 10 and the bis-Mannich base of 1,4-diaeetylbenzene 11 in a yield of 81%. The conversion of 9 into the alternating copolymers of p -phenylene-2,5-pyrrole 12 and p-phenylene-2,5-thiophene 13 is performed with liquid NH3 and Lawesson s reagent, respectively (scheme 3). Upon doping with either Ig or AsFg both polymers 12 and 13 become electrically conducting with specific conductivities up to 0.1 S/cm. 

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