AS ELETROPOLIMERIZAÇÕES GALVANOSTÁTICA E POTENCIODINÂMICA (EM VOLTAGEM CONSTANTE) DOS COMPOSTOS HETEROCÍCLICOS E A SUA DESCRIÇÃO MATEMÁTICA
THE GALVANOSTATIC AND POTENTIODYNAMIC (IN CONSTANT VOLTAGE MODE) ELECTROPOLYMERIZATIONS OF HETEROCYCLIC COMPOUNDS. THE PROCESSES AND THEIR MATHEMATICAL DESCRIPTION
Tkach, Volodymyr; Nechyporuk, Vasyl'; Yagodynets, Petro
http://dx.doi.org/10.4322/tmm.2013.035
Tecnol. Metal. Mater. Min., vol.10, n3, p.249-256, 2013
Resumo
Os processos eletroquímicos da eletropolimerização anódica dos compostos heterocíclicos nos modos galvanostático e potenciodinâmico da voltagem constante (que se realizam para obter os revestimentos protetores de corrosão) são descritos matematicamente. Os modelos matemáticos correspondentes são analisados por meio da teoria da estabilidade linear e da análise de bifurcações. As instabilidades eletroquímicas, observadas experimentalmente são explicadas e interpretadas nas condições dos modelos.
Palavras-chave
Polímero condutores, Eletropolimerização, Oscilação eletroquímica, Estabilidade linear.
Abstract
The electrochemical processes of the anodic electropolymerization of heterocyclic compounds in galvanostatic and potentiodynamic constant-voltage mode, realized to obtain the corrosion-protecting coatings, are mathematically described. The correspondent mathematical models, by using the linear stability theory and bifurcation analysis, are analyzed. The experimentally observed electrochemical instabilities in the conditions of the models are explained.
Keywords
Conducting polymer, Electropolymerization, Electrochemical oscillation, Linear stability
Referências
1. Lemos Castagno KR. Eletropolimerização de pirrol sobre liga de alumínio 1100 [tese de doutorado]. Porto Alegre: Universidade Federal do Rio Grande do Sul; 2007.
2. Tkach VV, Nechyporuk VV. As causas gerais do comportamento oscilatório dos sistemas eletroquímicos da eletropolimerização dos compostos heterocíclicos sob as condições da passivação. In: Anais do 11. Congresso Brasileiro de Polímeros; 16-20 out. 2011; Campos do Jordão, Brasil. São Carlos: ABPol; 2011. n. 1078.
3. Ramanavicius A, Ramanaviciene A, Malinauskas A. Electrochemical sensors, based on conducting polymer polypyrrole. Electrochimica Acta. 2006;51:6025- 6037. http://dx.doi.org/10.1016/j.electacta.2005.11.052
4. McQuade, T, Pullen A, Swager TM. Conjugated polymer-based chemical sensors. Chemical Reviews. 2000;100:2537-2574. http://dx.doi.org/10.1021/cr9801014
5. Tosar Rovira JP. Estudio de la inmovilización de oligonucleótidos a electrodos modificados de oro:polipirrol, y detección de secuencias complementares [tese de licenciatura]. Montevideo: Universidad de la República; 2008.
6. Ba-Shammakh MS. Electropolymerization of pyrrole on mild steel for corrosion protection [dissertação de mestrado]. Saudi Arabia: King Fahd University; 2003.
7. Tkach VV, Nechyporuk V, Yagodynets P. The mathematical description of sensor properties of nanocoatings obtained by electropolymerization of heterocyclic compounds [abstract]. In: Abstract of 7. Turkish Nanoscience and Nanotechnology Conference; 2011 June 26 - July 1; Istanbul, Turkish. Istambul: Sabanci University; 2011. p. 173
8. Tkach VV, Nechyporuk V, Yagodynets P, Meslyuk yv. The mathematical modeling of the sensor functions of mediated conductive polymer sensors obtained by electropolymerization of heterocyclic compounds. In: Abstracts of 2. International Conference in Organic Chemistry; 2011 Sept 25-27; Tbilisi, Georgia. Advances in heterocyclic chemistry. Tbilisi: GSTU; 2011. p. 101-102.
9. Tkach VV, Nechyporuk V, Yagodynets P, Rocha AM. The mathematical modeling of the sensor functions of the electochemical unmediated enzyme-containing sensors in potentiostatic mode In: Abstracts of 2. International Conference in Organic Chemistry; 2011 Sept 25-27; Tbilisi, Georgia. Advances in heterocyclic chemistry, GSTU, Tbilisi; 2011. p. 126-127.
10. Tkach VV, Nechyporuk V, Yagodynets P. O modelo matemático do comportamento de sensores eletroquímicos obtidos através da polimerização eletroquímica dos compostos heterocíclicos In: Anais do 11. Congresso Brasileiro de Polímeros; 16-20 out 2011; Campos do Jordão, Brasil. São Carlos: ABPol; 2011. n. 1058
11. Krische B, Zagorska M. The polythiophene paradox. Synthetic Metals. 1989;28:263-268. http://dx.doi. org/10.1016/0379-6779(89)90531-6
12. Tkach VV, Nechyporuk V. The mathematical description for the “polythiophene paradox” In: Abstracts of International Symposium on Flexible Organic Electronics; 2011 July 10-14th; Thessaloniki, Greece. Thessaloniki: Arystotelis University; 2011. p. 148.
13. Das I, Agrawal NR, Ansari SA, Gupta SK. Pattern formation and oscillatory electropolymerization of thiophene. Indian Journal of Chemistry. 2008;47A:1798-1803.
14. Das I, Agrawal NR, Gupta SK, Rastogi RP. Fractal growth kinetics and electric potential oscillations during electropolymerization of pyrrole. The Journal of Physical Chemistry. 2009;113:5296-5301. http://dx.doi. org/10.1021/jp8064147
15. Das I, Agrawal NR, Choudhary R, Gupta SK. Fractal growth patterns and oscillations in potential during electropolymerization of aniline with mono and mixed surfactants. Fractals. 2001;3:317-328.
16. Sazou D. The dynamic behavior of the electrochemical polymerization of indole in on Fe in acetonitrile: water mixtures. Synthetic Metals. 2002;130:45-54. http://dx.doi.org/10.1016/S0379-6779(02)00110-8
17. Aoki K, Mukoyama I, Chen J. Polymerization and dissolution of polythiophene films. Russian Journal of Electrochemistry (Elektrokhimiya). 2004; 3:319-324.
18. Sadki S, Schottland P, Brodie N, Saboraud G. The mechanism of pyrrole electropolymerization. Chemical Society Reviews. 2000; 29:283-293. http://dx.doi.org/10.1039/a807124a
19. Diaz AF, Kanazawa KK, Gardini GP. Electrochemical polymerization of pyrrole. Journal of the Chemical Society, Chemical Communications. 1979;42: 635-636. http://dx.doi.org/10.1039/c39790000635
20. Kim K-J, Song H-S, Kim J-D. Bulletin of Korean Chemical Society. 1988;9:248-51.
21. Asavapiriyanont S, Chandler GK, Gunawardena GA, Pletcher DJ. The electrodeposition of polypyrrole filmas from aqueous solutions. Interfacial Electrochemistry. 1984;177:229-244. http://dx.doi.org/10.1016/0022-0728(84)80225-9
22. Qiu Y-J, Reynolds JR. Electrochemically initiated chain polymerization of pyrrole in aqueous media. Journal of Polymer Science A: Polymer Chemistry. 1992; 30:1315-1325. http://dx.doi.org/10.1002/pola.1992.080300709
Facebook
Google+
Twitter
LinkedIn
Mendeley
StumbleUpon
CiteULike
Reddit
Email