Studies of the intermolecular interactions in polypyrrole and conjugated composites based on polypyrrole

We report the effects of different intermolecular interactions on the prope rties of soluble dodecyl-benzenesulphonate (DBS)-doped polypyrrole (PPY) an d composites. The contribution of the intermolecular interactions to the op tical properties of PPY and composites has been investigated by UV-vis tran smission spectroscopy, Polymer-solvent interactions result in different cha in conformations that are responsible for the changes in the absorption spe ctra of PPY(DBS). Some relevant differences between the filtered soluble fr action and the initial as-synthesised PPY(DBS) are demonstrated by the IR a bsorption spectra, In order to study how the molecular interaction between the components affects the properties of the composite, we mix different ty pes of polymers: (i) doped polypyrrole and an undoped highly fluorescent po lymer (methyl-substituted ladder-type polyparaphenylene, m-LPPP); (ii) dope d polypyrrole and an electronically inert polymer (polymethylmethacrylate, PMMA), The changes induced by high pressures on the absorption spectra of P PY(DBS) and m-LPPP/PMMA/PPY(DBS) are discussed in terms of chain conformati on changes and dipolar-dipolar interactions. The fast magic angle spinning (MAS) spectra of PPY(DBS) provide a structural and dynamical investigation on conjugated polymers based on H-1 NMR spectroscopy, Copyright (C) 2000 Jo hn Wiley & Sons, Ltd.