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Titolo:
THERMOREVERSIBLE GELS OF POLYANILINE - VISCOELASTIC AND ELECTRICAL EVIDENCE ON FUSIBLE NETWORK STRUCTURES
Autore:
VIKKI T; RUOKOLAINEN J; IKKALA OT; PASSINIEMI P; ISOTALO H; TORKKELI M; SERIMAA R;
Indirizzi:
HELSINKI UNIV TECHNOL,DEPT ENGN MATH & PHYS,POB 2200 FIN-02015 HUT ESPOO FINLAND HELSINKI UNIV TECHNOL,DEPT ENGN MATH & PHYS FIN-02015 HUT ESPOO FINLAND NESTE OY,CORP TECHNOL FIN-06101 PORVOO FINLAND VTT ELECT,ELECT MAT & COMPONENTS,TECH RES CTR FINLAND ESPOO FINLAND UNIV HELSINKI,DEPT PHYS FIN-00014 HELSINKI FINLAND
Titolo Testata:
Macromolecules
fascicolo: 14, volume: 30, anno: 1997,
pagine: 4064 - 4072
SICI:
0024-9297(1997)30:14<4064:TGOP-V>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
COUNTERION INDUCED PROCESSIBILITY; CONDUCTING POLYMER GEL; CONCENTRATED-SOLUTIONS; PHASE-TRANSFORMATIONS; BLENDS; ACID; TEMPERATURE; SURFACTANT; SOLVENTS; FIBERS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
53
Recensione:
Indirizzi per estratti:
Citazione:
T. Vikki et al., "THERMOREVERSIBLE GELS OF POLYANILINE - VISCOELASTIC AND ELECTRICAL EVIDENCE ON FUSIBLE NETWORK STRUCTURES", Macromolecules, 30(14), 1997, pp. 4064-4072

Abstract

We demonstrate thermoreversible gelation of a conductive polymer, i.e., rubber-like melt processible electrically conducting compounds. Combination of viscoelastic and electrical conductivity measurements suggests network formation in the gel state and gel melting at elevated temperatures. The gels have been prepared by dissolving polyaniline in dodecylbenzenesulfonic acid (DBSA) using formic acid as a processing medium which mas removed at the end. Importantly, without formic acid, reversible gelation and particle-free materials mere not achieved even at the resolution of optical microscopy. For T < T-gel the materials behave elastically in compression experiments, the storage and loss moduli do not depend much on frequency, and the electrical conductivity is primarily electronic, probably due to high chain-to-chain hopping conductivity. For T > T-gel the onset of liquid-like flow is detected using modified ball drop method by dynamic mechanical analysis, the dynamic moduli become strongly frequency dependent, and the electrical conductivity drops orders of magnitude to the value corresponding to the ionic conductivity of DBSA, suggesting that the chains are not in direct contact. The physical crosslinks are probably localized mesomorphicdomains which allow melting.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 14:15:39