Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Anharmonicity and fragility in semi-interpenetrating polymer networks
Autore:
Carini, G; DAngelo, G; Tripodo, G; Bartolatta, A; Di Marco, G; Privalko, VP;
Indirizzi:
Univ Messina, Dipartimento Fis, I-98166 Messina, Italy Univ Messina Messina Italy I-98166 artimento Fis, I-98166 Messina, Italy Univ Messina, INFM, I-98166 Messina, Italy Univ Messina Messina Italy I-98166 Messina, INFM, I-98166 Messina, Italy CNR, Ist Tecn Spettroscopiche, I-98166 Messina, Italy CNR Messina Italy I-98166 t Tecn Spettroscopiche, I-98166 Messina, Italy Natl Acad Sci Ukraine, Inst Macromol Chem, UA-253160 Kyiv, Ukraine Natl Acad Sci Ukraine Kyiv Ukraine UA-253160 em, UA-253160 Kyiv, Ukraine
Titolo Testata:
JOURNAL OF PHYSICS-CONDENSED MATTER
fascicolo: 15, volume: 12, anno: 2000,
pagine: 3559 - 3568
SICI:
0953-8984(20000417)12:15<3559:AAFISP>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
LINEAR POLYURETHANE; TEMPERATURE-DEPENDENCE; ENTHALPY RELAXATION; GLASSY-POLYMERS; PRIOR HISTORY; SCATTERING; LIQUIDS; NONLINEARITY; BEHAVIOR; IPNS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Carini, G Univ Messina, Dipartimento Fis, Contrada Papardo Salita Sperone 31, I-98166 Messina, Italy Univ Messina Contrada Papardo Salita Sperone 31 Messina Italy I-98166
Citazione:
G. Carini et al., "Anharmonicity and fragility in semi-interpenetrating polymer networks", J PHYS-COND, 12(15), 2000, pp. 3559-3568

Abstract

Two series of semi-interpenetrating polymer networks (semi-IPN) based on the same linear polyurethane and two different heterocyclic polymer networkswere characterized in terms of the complex dynamic modulus and the mechanical loss tangent, measured between 150 and 500 K at a frequency varying in the range between 0.3 and 30 Hz. The fragility and the deviations from exponentiality of the dynamics of the segmental motion of semi-IPNs in the glass transition interval have been obtained by modelling the mechanical alpha(a)-relaxation. It was observed that the incorporation of linear polyurethane softens the heterocyclic polymer networks, lowers their resistance to thetemperature-induced structural degradation, and increases the complexity of the long-range segmental dynamics. There has also been found a correlation between the fragility and the anharmonicity of the system, the most fragile polymer being characterized by the largest degree of anharmonicity. By extending the analysis to linear polymers, it was established that a growinganharmonicity is predictive of an increasing fragility.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 10:25:18