Synthesis, characterization and conductive properties of poly

Synthesis, characterization and conductive properties of poly

Synthesis, characterization and conductive properties of
poly-3-amine-1,2-4-trizole.
Enrique de la Horra1, Melisa Lamanna2, Silvia Jacobo1 and N. B. D’Accorso2.
1
Dpto de Química, Facultad de Ingeniería – Universidad de Buenos Aires
Centro de Investigaciones en Hidratos de Carbono (CIHIDECAR-CONICET).
Dpto. de Química Orgánica, Facultad de Ciencias Exactas y Naturales.
Universidad de Buenos Aires, Ciudad de Buenos Aires (1429), Argentina.
email: [email protected].
Conducting polymers (CP) have attracted
considerable interest since the invention of doped
polyacetylene in 1977 [1]. Since then, a large variety of
conjugated polymers have been developed, such as
polythiophenes, polyanilines and polypyrroles. CP
show almost no conductivity (uncharged) state. Their
intrinsic conductivity results for the formation of
charge carriers upon oxidizing (p-doping) or reducing
(n-doping) their conjugated backbone. Oxidation of the
neutral polymer and following relaxation processes
causes the generation of localized electronic states and
a so-called polaron is formed [2].
Due to the interest in the development of new
conductive polymers, we are working in the synthesis,
characterization of poly-3-amine-1,2-4-trizole (PAT).
The 3-amine-1,2-4-triazole (3AT) is a monomer water
soluble and easily polymerized when is treated with
ammonium persulphated in neutral
media. The
polymer is precipitated when we added basic media.
The new polymer was characterized by physical,
spectroscopical and thermal methods.
The PAT is no conductive material, however polymer
powders protonated with camphorsulfonic acid (CSA)
exhibit media conductivities (10-5S/cm). These results
are similar to PANI [3].
We will show the synthetic pathway, the
characterization and the conductivity evaluation. An
example of that is the thermal analysis -which is shown
in Figure 1- where we can see the different thermal
behaviour between the monomer and the polymer.
Polimerization of 3-amine-1,2,4-triazole
1,2
1
0,8
mg
2
0,6
0,4
0,2
P-3ATA (Enrique)
3ATA
0
0
100
200
300
400
500
600
T (°C)
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Figure 1: Thermal analysis of 3AT ( )and PAT ( ).
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Acknowledgements:
• To Química (FIUBA) y Departamento de
Orgánica (FCEyN) y al FOMEC, for the equipment.
• The authors wish to thank CONICET, for the
economical support of the fellowshift for Melisa Elsa
Lamanna’s PHD studies.
• We are grateful to UBA, UBACyT (I-055),
CONICET y Agencia Nacional de Promoción
Científica y Tecnológica for financial support.
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n
deprotonation
References:
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HN
[1] C.K.Chiang et al, Phys.Rev.Lett.39, 1098 (1977)
[2] P.Chandrasekhar, Conducting Polymers, Fundamentals and
Application: A Practical Approach, Sproinger, 1999, p.35
[3] Stejskal J. and Sapurina I. Macromolecules
1998;31(7):2218-2222.
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n