High-Quality Conducting Polymers Prepared From 3-Methylthiophene And Pyrrole, Indole, Carzole By Electrochemical Copolymerization

Electrochemical polymerization has been proved to be one of the most usefulapproaches for conducting polymer synthesis. High-quality inherently conductingpolymers prepared using fused ring aromatic compounds as monomers byelectrochemical copolymerization has attracted great attention in recent years. It is wellknown that Boron trifluoride diethyl etherate solution is a middle strong Lewis acid. It isalso a better electrolyte for the electrosyntheses of high quality conducting polymers fromvarious aromatic monomers, such as Thiophene, Pyrrole, Indole and their derivatives.This dissertation focused on the electrochemical copolymerization of 3-Methylthiopheneand Pyrrole, Indole, Carbazole was also investigated in Boron trifluoride diethyl etherateand its mixed electrolytes of Boron trifluoride diethyl etherate and Diethyl ether, andsome characterizations were given for corresponding pure polymer and copolymer.1. The copolymerization of Pyrrole and 3-Methylthiophene was successfullyachieved electrochemically in the mixed of Boron trifluoride diethyl etherate and Diethylether containing different concentration ratio of Pyrrole and 3-Methylthiophenemonomers for the first time. The influence of applied polymerization potential anddifferent concentration ratio of Pyrrole and 3-Methylthiophene monomers on thesynthesis of copolymer were investigatived at large. The results indicated copolymers ofboth Pyrrole and 3-Methylthiophene possessed good redox activity.2. The copolymerization of Indole and 3-Methylthiophene was successfully achievedelectrochemically in Boron trifluoride diethyl etherate by direct anodic oxidation of themonomer mixtures for the first time. As-formed free-standing insoluble copolymers owned both the advantages of Polyindole and Poly(3-methylthiophene), i.e., good thermalstability, good electrochemical activity and high conductivity. The influence of appliedpolymerization potential on the synthesis of copolymer was investigated. The resultsindicated 1.3 V vs. SCE was tested to be the best potential for the electrochemicalcopolymerization of Indole and 3-Methylthiophene.3. The copolymedzation of Carbazole and 3-Methylthiophene was successfullyperformed electrochemically in freshly distilled Boron trifluoride diethyl etherate bydirect anodic oxidation of the monomer mixtures for the first time. The influence of theapplied polymerization potential on the synthesis of the copolymers was investigated. Theresults indicated the higher potential favored the incorporation of 3-Methylthiopheneunits into the copolymers. The novel copolymers had the advantages of bothPolycarbazole and Poly(3-methylthiophene), that is, good redox activity, good thermalstability, and high conductivity.