Synthesis of polymers containing pyrrole or derivatives thereof

Pyrrole based polymers were syntheszed via chemical oxidative and electrochemical polymerization to improve electrical conductivity, yield and processability of polypyrrole. Chemical polymerization was performed with inorganic oxidants such as ferric and ceric salts, potassium persulfate and mixtures thereof. Influence of solvent, reaction temperature and time, type of oxidant, oxidant/monomer ratio and a dopant on properties of products were investigated. Cerium(IV) oxidic dibenzoate (CODB) and phenyliodine(III) bis(trifluoroacetate) (PIFA) were used as organic oxidants that provided opportunity to obtain polypyrrole in aprotic solvents such as toluene and dichloromethane. Polypyrroles with conductivities of 5–10-3 S/cm and 1–10-2 S/cm were synthesized without dopants in the presence of PIFA and CODB, respectively. Polypyrroles with conductivities of 10-4–100 S/cm were prepared with various types of oxidants. Copolymers of pyrrole with ketonic resins, poly(dimethylsiloxane)s, poly(ethylene glycol) and derivative thereof, and methyl acrylate were synthesized chemically. Conductivity, yield, morphology and thermal properties of products were investigated. Polypyrrole based copolymers with conductivities of 10-5–10-1 S/cm were synthesized. Pristine and organomodified Na–Montmorillonite were used to produce nanocomposites with copolymers of pyrrole and poly(dimethylsiloxane). Hydroxide groups of ketonic resin were reacted with 2–thiophene carbonyl chloride via esterification reaction and resins with thiophene end groups (CFTh2R and CFTh4R) were obtained. The modified resins were used to prepare copolymers containing polypyrrole in presence of iron(III) chloride. Electrochemical polymerization was applied to synthesize pyrrole/resin and thiophene/resin copolymers. Corrosion behavior of coatings were investigated in H2SO4 and NaCl solutions. Results showed that coatings are candidates for anticorrosion applications.