Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
DETERMINATION OF THE THERMAL-CONDUCTIVITY OF POLYPYRROLE OVER THE TEMPERATURE-RANGE 280-K-335-K
Autore:
LUNN BA; UNSWORTH J; BOOTH NG; INNIS PC;
Indirizzi:
UNIV TECHNOL SYDNEY,CTR MAT TECHNOL,POB 123 BROADWAY NSW 2007 AUSTRALIA
Titolo Testata:
Journal of Materials Science
fascicolo: 18, volume: 28, anno: 1993,
pagine: 5092 - 5098
SICI:
0022-2461(1993)28:18<5092:DOTTOP>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
AC CALORIMETRIC METHOD; DIFFUSIVITY MEASUREMENT; ELECTRICAL-CONDUCTIVITY; POLYACETYLENE; SAMPLE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
B.A. Lunn et al., "DETERMINATION OF THE THERMAL-CONDUCTIVITY OF POLYPYRROLE OVER THE TEMPERATURE-RANGE 280-K-335-K", Journal of Materials Science, 28(18), 1993, pp. 5092-5098

Abstract

Samples of polypyrrole were synthesised under galvanostatic conditions to produce films possessing a range of electrical conductivity from 10(-3) to 1 0 S cm-1. The electrical and thermal conductivity of thesefilms has been determined between 280 and 335 K. The electrical conductivity was measured using a four probe technique calibrated against ASTM D4496-87. Thermal conductivity was determined from measurements ofthermal diffusivity, specific heat and density. Thermal diffusivity was determined. using a modified a.c. calorimetry technique, while differential scanning calorimetry (DSC) was used to determine specific heat. The polymer's density was measured using Archimedes' principle. Theresults were used to calculate the Lorenz number of polypyrrole.-A comparison of the predicted behaviour and experimental results was made. Thermal conductivity is found to be large compared to that predicted from the electrical conductivity measurements on low conductivity films. Molecular vibration effects are found to be non-trivial and experimental means for measuring their contribution are mentioned. While polypyrrole has been regarded as a ''synthetic metal'' the thermal conductivity results show this classification is wrong.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 15:03:34