Compositions comprising a plurality of carbon nanotubes, a host polymer, and A block copolymer comprising a first block and a second block, wherein no block is compatible with the host polymer. In one aspect, the block copolymer is amphiphilic. In another aspect, the block copolymer may comprise a first block and a second block, wherein at least one of the first and second blocks comprises repeating units derived from a monomer having the general formula: (R)2C═C(R)(Rf) wherein Rf is selected from fluorine, a C1 to C10 fluorinated or perfluorinated alkyl group, and a C1 to C10 fluorinated or perfluorinated alkoxy group; each R is independently selected from F, H, Cl, Rf, a C1 to C10 alkyl group, and R2A, wherein R2 is a C1 to C10 alkylene group and A is selected from CO2M and SO3M, wherein M is selected from H, an ammonium and organo onium group.