Abstract
Π-conjugated polymers have attracted a great attention during the past decades due to their fascinating electronic and optical properties. This work deals with the design, the synthesis and the characterization of -conjugated polymers based on poly(3-hexylthiophene) (P3HT). Homopolymers, random and block copolymers have been synthesized by using the Kumada Catalyst-Transfer Polycondensation (KCTP) method. Cationic groups such as N-methylimidazolium, trimethylammonium, trimethylphosphonium and pyridinium were successfully introduced into the polymers side chains leading to water soluble polymers. The physicochemical properties (behavior in solution, thermal stability…) of these -conjugated polyelectrolytes (CPEs) were studied by SANS, DLS, flash DSC, TGA… The interaction of CPEs with DNA as well as their use as cathodic interfacial layer in solar cells was described. Finally, another aspect of work consists of introducing in P3HT-based copolymers side chains porphyrins aiming at broadening the absorption spectrum of these polymers. The thermal stability, the optical and morphological properties and the electrochemical behavior of these polythiophene-porphyrine copolymers were studied.