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Titolo:
EXPERIMENTAL AND THEORETICAL-STUDIES OF THE MOLECULAR MOTIONS IN POLYMER CRAZING - 1 - TUBE MODEL
Autore:
HAN HZY; MCLEISH TCB; DUCKETT RA; WARD NJ; JOHNSON AF; DONALD AM; BUTLER M;
Indirizzi:
UNIV LEEDS,DEPT PHYS & ASTRON,INTERDISCIPLINARY RES CTR POLYMER SCI &TECHNOL LEEDS LS2 9JT W YORKSHIRE ENGLAND UNIV LEEDS,DEPT PHYS & ASTRON,INTERDISCIPLINARY RES CTR POLYMER SCI &TECHNOL LEEDS LS2 9JT W YORKSHIRE ENGLAND UNIV LEEDS,SCH CHEM LEEDS LS2 9JT W YORKSHIRE ENGLAND UNIV CAMBRIDGE,CAVENDISH LAB CAMBRIDGE CB3 0HE ENGLAND
Titolo Testata:
Macromolecules
fascicolo: 4, volume: 31, anno: 1998,
pagine: 1348 - 1357
SICI:
0024-9297(1998)31:4<1348:EATOTM>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
DISENTANGLEMENT; TEMPERATURE; INTERFACES; FRACTURE; FILMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
17
Recensione:
Indirizzi per estratti:
Citazione:
H.Z.Y. Han et al., "EXPERIMENTAL AND THEORETICAL-STUDIES OF THE MOLECULAR MOTIONS IN POLYMER CRAZING - 1 - TUBE MODEL", Macromolecules, 31(4), 1998, pp. 1348-1357

Abstract

A theoretical model has been developed to calculate the craze surfaceenergy for monodisperse linear polymers based on the ''tube model'' of polymer melts. This model, which is a refinement of models previously proposed, assumes that the essential molecular processes of chain scission and disentanglement occur in the ''active zone''-a region of thickness greater than or equal to the chain radius of gyration, situated at the interface between craze and bulk polymer. At high temperatures, greater than a critical temperature, T > T-tr, craze growth occurs by stress-assisted chain disentanglement; below a second critical temperature, T-cr, craze growth occurs by chain scission. Between these critical temperatures, which are molecular weight and strain-rate dependent, craze growth involves both scission and disentanglement. New experimental data on craze growth in monodisperse, linear polystyrene overa range of temperatures at two strain rates are presented, which are well described by the new theory. The theory describes all features ofthe data with only one fitting parameter, including small peaks observed in the crazing strain/temperature graphs in the mixed-mode region. Similar features have been reported recently in craze data from poly(methyl methacrylate) without explanation.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 04:47:36