Aqueous blends and films comprising a first electrically conducting conjugated polymer and a second electrically conducting conjugated polymer

Abstract

An aqueous blend comprising water, a first conjugated polymer having a conductivity of greater than 10 −7 S/cm and a second conjugated polymer having a conductivity greater than 10 −7 S/cm wherein the conductivities of the first conjugated polymer and the second conjugated polymer are measured using a four point probe method prior to preparing the aqueous blend. A film is also presented comprising a first conjugated polymer having a conductivity of greater than 10 −7 S/cm and a second conjugated polymer having a conductivity greater than 10 −7 S/cm formed by (a) depositing the recited aqueous blend onto an article and (b) removing the water-containing solution to form the film on the article.

1 . An aqueous blend comprising water, a first conjugated polymer having a conductivity of greater than 10 −7  S/cm and a second conjugated polymer having a conductivity greater than 10 −7  S/cm wherein the conductivities of the first conjugated polymer and the second conjugated polymer are measured using a four point probe method prior to preparing the aqueous blend.  
     
     
         2 . The aqueous blend of  claim 1  where the first conjugated polymer and the second conjugated polymer are independently selected from a polymer having a backbone selected from the group consisting of poly(acetylene), poly(thiophene), poly(aniline), poly(pyrrole), poly(phenylene), poly(phenylene vinylene), poly(thienyl vinylene), poly(phenylene sulfide), poly(aniline)sulfonate, poly(3,4-ethylenedioxythiophene) and poly(thieno[3,4-b]thiophene).  
     
     
         3 . The aqueous blend of  claim 1  wherein at least one of the first conjugated polymer and the second conjugated polymer is doped with a p-type dopant.  
     
     
         4 . The aqueous blend of  claim 3  where the p-type dopant is selected from the group consisting of a halogen, a mineral acid, an organic acid, a poly(sulfonic acid), amic acid precursors of polyimides, a poly(carboxylic acid) and mixtures thereof.  
     
     
         5 . The aqueous blend of  claim 1  wherein at least one of the first conjugated polymer or the second conjugated polymer is doped with an n-type dopant.  
     
     
         6 . The aqueous blend of  claim 1  wherein the first conjugated polymer is poly(aniline)sulfonate and the second conjugated polymer is poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulfonic acid).  
     
     
         7 . The aqueous blend of  claim 1  wherein the first conjugated polymer is poly(aniline)sulfonate and the second conjugated polymer is poly(pyrrole) doped with an organic acid.  
     
     
         8 . The aqueous blend of  claim 1  wherein the first conjugated polymer is poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulfonic acid) and the second conjugated polymer is poly(pyrrole) doped with the organic acid.  
     
     
         9 . The aqueous blend of  claim 1  wherein the first conjugated polymer is poly(aniline)sulfonate and the second conjugated polymer is poly(thieno[3,4-b]thiophene) doped with poly(styrene sulfonic acid).  
     
     
         10 . The aqueous blend of  claim 1  wherein the first conjugated polymer is poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulfonic acid) and the second conjugated polymer is poly(thieno[3,4-b]thiophene) doped with poly(styrene sulfonic acid).  
     
     
         11 . The aqueous blend of  claim 1  comprising from 5 wt % to 95 wt % of the first conjugated polymer based on total doped conjugated polymer solids.  
     
     
         12 . The aqueous blend of  claim 1  further comprising an additive selected from the group consisting of a surfactant, an organic solvent, a poly(hydroxy alcohol), a water miscible polymer, a p-type dopant and mixtures thereof.  
     
     
         13 . The aqueous blend of  claim 12  which contains from 2 wt % to about 90 wt % of the additive based on total solids.  
     
     
         14 . The composition of  claim 13  wherein the additive is a water miscible polymer selected from the group consisting of poly(vinyl pyrrolidone), poly(ethylene oxide), poly(acrylic acid) and mixtures thereof.  
     
     
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