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Titolo:
A PHYSICAL APPROACH IN THE UNDERSTANDING OF THE PHENOMENA ACCOMPANYING THE THERMAL-TREATMENT OF LIGNIN
Autore:
KIFANISAHBAN F; KIFANI A; BELKBIR L; ZOULALIAN A; ARAUZO J; CARDERO T;
Indirizzi:
FAC SCI RABAT,LAB REACTIV SYST SOLIDE GAZ,BP 1014 RABAT MOROCCO FAC SCI RABAT,LAB MECAN,GRP POLYMERES & COMPOSITES RABAT MOROCCO UNIV NANCY 1,LAB GENIE PROC NANCY FRANCE UNIV ZARAGOZA,DEPT CHEM ENGN,CTR POLYTECH E-50009 ZARAGOZA SPAIN UNIV MALAGA,FAC SCI,DEPT CHEM ENGN E-29071 MALAGA SPAIN
Titolo Testata:
Thermochimica acta
fascicolo: 1-2, volume: 298, anno: 1997,
pagine: 199 - 204
SICI:
0040-6031(1997)298:1-2<199:APAITU>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
CELLULOSE; PYROLYSIS; POLYMERS; WOOD;
Keywords:
CRAZING; FRACTURE; LIGNIN; MECHANICAL STRESS; PLASTIC PHASE; THERMAL STRESS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
19
Recensione:
Indirizzi per estratti:
Citazione:
F. Kifanisahban et al., "A PHYSICAL APPROACH IN THE UNDERSTANDING OF THE PHENOMENA ACCOMPANYING THE THERMAL-TREATMENT OF LIGNIN", Thermochimica acta, 298(1-2), 1997, pp. 199-204

Abstract

In this work, a mechanical approach is associated with the thermal behavior of lignin. Samples of lignin are submitted to a thermal treatment accomplished at different final temperatures of pyrolysis. The dimensional variations which occurred during the degradation of lignin arequantified by the Jacobian of the transformation. The increase of theJacobian in the interval 180 to 260 degrees C signifies the formationand the development of a plastic phase by crazing as is indicated by scanning electron microscope micrographs of lignin residues. The apparition and the evolution of the plastic phase are not a new fact in fracture mechanics, but the characterisation of this phase and the mechanics of its formation and its fracture allow us to explain some aspectsuntil now unknown in the thermal decomposition of lignin. The importance of this work relies on the analogy made between the thermal behaviour of lignin and the mechanical behaviour of polymers. This analogy permits us to make some interpretations and, for the first time, to explain the weak weight loss and the exothermic effect of the thermal degradation of lignin. (C) 1997 Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/09/20 alle ore 11:11:38