Study On Several New Carbon Bridge Linked Thiophene Derivatives For Bulk Polymerization

Since the discovery of the conductivity of doped polyacetylene have been comparable with that of metals in 1980s,the study of conductive polymers is becoming more and more popular.Polythiophene has been favored by researchers in many fields because of its excellent electrochemical activity,environmental stability and ease of preparation.From the initial study of its conductivity it has gradually extended to a wider range of applications,such as biological sensors,organic solar cells,organic light-emitting diodes,organic field effect transistor and so on.Though solid state polymerization was developed in the 1960s,it was applied to the synthesis of polythiophene in 2003.Compared with the traditional polymerization methods,solid state polymerization was low-cost,environment-friendly,low energy consumption,catalyst(or initiator)free with the generation of polymer with high purity and regularity.The purpose of this thesis is to make polythiophene be modified,synthesized,and application in many fields through reasonable design.The main contents include:1.Common optoelectronic moieties such as thiophene,carbazole and fluorine are introduced into the side chains based on EDOT-CH(R)-EDOT platform and the corresponding polymers were formed through solid state polymerization.The results show that the introduction of optoelectronic moieties broadened the spectrum of the polymer.At the same time,the introduction of the alkyl chain reduced the intermolecular force,resulted in a decrease in the initial polymerization temperature(Tonset)of the monomers.According to the crystal analyze and the Tonset of the monomer,the linear relationship between the alkyl chain substituted and non-alkyl chain substituted monomeric Tonset and the effective distance of I-I was established.With respect of the solid state polymerization,polymer can obtain a higher molecular weight via the melt polymerization.2.Different push-pull electron groups were introduced into the side chain based on Thiophene-CH(R)-Thiophene platform,and corresponding polymers were obtained via solid/melt state polymerization.The results show that the monomers which thiophene moieties instead of EDOT group can be subjected via solid/melt state polymerization.At the same time,the introduction of the push-pull electron group can change the spectrum of the polymer,and the strong acid(TFA)also can broaden the polymer spectrum.Such polymers are expected to be sensors for the detection of acidic environments.