SVIBOR - Project code: 1-07-037

MINISTRY OF SCIENCE AND TECHNOLOGY

Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69
E-mail: ured@znanost.hr

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Project code: 1-07-037


CHEMICAL AND ELECTROCHEMICAL INVESTIGATIONS OF CONDUCTING POLYMERS


Main researcher: DUIĆ, LJERKA (10760)



Assistants
Type of research: basic
Duration from: 05/01/91. to 12/31/93.

Papers on project (total): 24
Papers on project quoted in Current Contents: 7
Institution name: Fakultet kemijskog inženjerstva i tehnologije, Zagreb (125)
Department/Institute: Department of electrochemistry
Address: Marulićev trg 19
City: 10000 - Zagreb, Croatia
Communication
E-mail: Ljerka.Duic@public.srce.hr
Fax: 385 (0)1 43-07-00
Phone: 385 (0)1 43-07-00

Summary: Chemical and electrochemical polymerization of aniline and pyrrole has been carried out. The influence of different chemical oxidans on the characteristics of resulting polypyrrole has been investigated. In electrochemical polymerization several electrochemical techniques have been utilized: cyclic voltammetry, potential step and constant potential electrolysis using stationary and rotating disk electrode. Several variables (different supporting electrolytes, concentrations of monomers, pH of the solution, anodic potential of synthesis, temperature) in the course of experiments have been tested and their influence on the characteristics on the polymers obtained have been established. A catalytic influence of polyaniline film, prepared from sulphuric and perchloric acid solutions, on hydroquinone/benzoquinone and Fe2+/Fe3+ reactions has been investigated. The effect of PANI layer thickness on redox reactions has been established, as well as different kinetics depending on the counter-ion incorporated. The location of the reactions taking place is discussed. The evidence is given for PANI metal-like behaviour at potentials of emeraldine existence and redox-polymer behaviour at potentials of pernigraniline existence.

Keywords: polyanilne, polypyrrole, polymerization, electrochemical polymerization, conducting polymers, electrocatalysis, location of reaction, counter-ion influence

Research goals: - The elucidation of the overall reaction mechanism in chemical and electrochemical synthesis of conducting polymers (polyaniline and polypyrrole) and the influence of the experimental parametra on the distrubution of products - The influence of the experimental parametra (potental of synthesis, different supporting electrolytes) on the polymerization reaction rate as well as on the nucleation process of polymers - The establishing of the catalytic activity of conducting polymers as electrode materials on other systems - The characterization of obtained polymers through morphology, stability and conductivity


COOPERATION - INSTITUTIONS


  1. Name of institution: Fakultet strojarstva i brodogradnje, Sveučilište u Zagrebu
    Type of institution: University/Faculty
    Type of cooperation: Joint publishing of scientific papers
    City: 10000 - Zagreb, Croatia

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Last update: 10/06/95
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