Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 44: Issue 2
The calorimetric determination of the ceiling temperature for the chemical polymerization of pyrrole
Implications on the electrical conductivity
Authors:
S. Cavallaro University of Messina Department of Industrial Chemistry I-98100 Messina Italy I-98100 Messina Italy

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A. Colligiani University of Naples Department of Food Science I-80055 Portici Italy I-80055 Portici Italy

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G. Cum University of Messina Department of Industrial Chemistry I-98100 Messina Italy I-98100 Messina Italy

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S. Foti University of Messina Department of Industrial Chemistry I-98100 Messina Italy I-98100 Messina Italy

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Pages:
269–280
Online Publication Date:
06 Jul 2007
Publication Date:
01 Feb 1995
Article Category:
Research Article
DOI:
https://doi.org/10.1007/bf02636118
Keywords:
aging of polypyrrole; calorimetry of conducting polymers; conductivity of polypyrrole; numeral molecular weight of conducting polymers; polypyrrole
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Abstract  

The previously found strong dependence of the polymerization enthalpy on the reaction temperature has been rationalized. The temperature dependence is to be ascribed to the existence of a ‘ceiling temperature’ for the polymerization process of the pyrrole monomer. The determined ceiling temperature has beenT≊350 K when FeCl3 was used as the oxidizing agent in CH3CN solution. The existence of a ceiling temperature together with its already determined exoenthalpic nature allows to classify the polymerization reaction as an exoentropic one. From the dependence of the yield of insoluble polymer on the reaction temperature, the trend of the relative mean numeral molecular massMn for the different obtained polymers has been determined. Measurements of electrical conductivity on pressed pellets of the different polymers allowed to establish a correlation between theMn value and the conductivities The dependence of the conductivity on the exposition time to the air allowed to do some essays on the aging behaviour of the obtained polypyrrole. By making some assumptions, an absolute calorimetric determination of the value ofMn of polypyrrole was tempted together with that of the related poly-N-vinilpyrrole.

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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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