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Poly(arylenevinylene)s are considered to be promising candidates for electrical and/or optical materials. Such applications require the use of conjugated polymers with a sufficiently high quality, purity, and molecular weight (Mw >30000). This dissertation deals with the study of the Dithiocarbamate precursor route as a possible synthetic route for the synthesis of low band gap (LBG) materials. Those materials show interesting properties which make them extremely attractive for application in plastic electronics. The processability becomes then a very important issue. This can be obtained either by introducing long side chains or by the use of a precursor route. In this dissertation both approaches are investigated. We aim at the development of an efficient synthetic route in order to obtain well defined materials. In collaboration with other research groups, the polymer produced were characterised and tested ....