Phenyl doped conjugated polymers

Other 3-substituted thiophenes that have been polymerized include 3-methoxy [309-311], other 3-alkoxy [312], 3-phenyl [313,314], 3-(4-methoxyphenyl) [314], 3-(4-trifluoromethylphenyl) [314], 3-bromo [315], 3-alkylsulfonatethiophene [316-318], and others [319-323]. Poly-3-alkylsulfonate thiophenes are particularly interesting due to a striking property. Sodium poly-3-thiophene-j8-ethanesulfonate and sodium poly-3-thiophene-6-butanesulfonate and their conjugate acids are water soluble in both the doped and undoped states [317,318]. Ikenoue et al. [318] examined the conduction mechanism for this self-doped conducting polymer. 

The precursor route has also been used effectively for poly(l,4-phenylenevinylene) (poly(p-phenylenevinylene), PPPV). This is obtained via a sulfonium salt in which the phenyl rings pin the conjugated structure of the final polymer (equation 2). Stretching during thermal elimination gives highly oriented films. Conductivities of 100 Scm" and 2780 S cmhave been reported for AsF -doped unoriented and oriented samples. Optical and IR spectra have been reported. 

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