Structure of near order in conducting polyaniline films

The structure of conducting polymer films of polyaniline (PAN), electrochemically obtained on Pt surface has been studied by means of electron. microscopy, electronography and X-ray diffraction analysis. It has been established that in process of conducting film formation. two basic structure types of macromolecular arrangement are formed. According to data of electronography at low angles scattering it is found that the polymer film to 80 nm. thicknesses is amorphous with a near order in a disposition of structure elements. Follows to photometry of electronographic patterns the radial distribution. of intensity as a function, of scattering vector S = 4 pi sin 0/lambda has been obtained. From the disposition of low angle maximum the size of repetitive fragments and a length of the conjugation in which the coplanar orientation of aromatic fragments is reserved (in average 5-6 elemental links) is calculated. With increasing of the film thickness from 80 to 300 nm the content of crystalline phases is arising, but the share of amorphous phase remains enough high. Obtained results permit to be apply for doped polyaniline of the "domain" or "granular" model of conductivity.