Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 58: Issue 1
Optimization of Polypyrrole Chemical Synthesis by Heat Flow Reaction Calorimetry
Author:
S. Cavallaro Industriale dell'Universitą Dipartimento di Chimica P.O. Box 29 I-98166 Sant'Agata di Messina Italy P.O. Box 29 I-98166 Sant'Agata di Messina Italy

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Pages:
3–12
Online Publication Date:
03 Nov 2004
Publication Date:
25 Oct 1999
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1010107331659
Keywords:
conducting polymers; polypyrrole; pyrrole; reaction calorimetry
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Abstract  

Chemical polymerization of pyrrole (Py) was carried out in a reaction calorimeter by using FeCl3 or CuCl2 as an oxidant in an acetonitrile medium. The formation heat of polypyrrole (PPy), determined under a wide range of reactant concentrations and reaction temperatures, is directly related to the PPy yields and to the degree of polymerization. Due to the negative values of both the entropy and enthalpy of the reaction the gravimetric yield is inversely related to the temperature and directly to the Py concentration. The yields to the PPy and the related reaction heats, are close to zero when the ceiling temperatures are reached (Tceil=348 K for Fe-doped and Tceil=313 K for Cu-doped PPys). It was observed that a ceiling concentration corresponds to each ceiling temperature and only light oligomers are formed if Py concentration is too low. The electric conductivity values of the products were also determined and a direct relationship to the yields was found as well. The highest electric conductivity value (C=0.6 S cm–1) was related to the PPy fresh synthesized from a 0.017 M Py solution.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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