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Titolo:
DRAWING AND ORIENTATION-RELAXATION BEHAVIOR OF MONODISPERSE LINEAR AND 3-ARM STAR POLYSTYRENES
Autore:
HAN HZY; DUCKETT RA; MCLEISH TCB; WARD NJ; JOHNSON AF;
Indirizzi:
UNIV LEEDS,INTERDISCIPLINARY RES CTR POLYMER SCI & TECHNOL,DEPT PHYS & ASTRON LEEDS LS2 9JT W YORKSHIRE ENGLAND UNIV LEEDS,INTERDISCIPLINARY RES CTR POLYMER SCI & TECHNOL,DEPT PHYS & ASTRON LEEDS LS2 9JT W YORKSHIRE ENGLAND UNIV BRADFORD,DEPT CHEM,INTERDISCIPLINARY RES CTR POLYMER SCI & TECHNOL BRADFORD BD7 1DP W YORKSHIRE ENGLAND
Titolo Testata:
Polymer
fascicolo: 7, volume: 38, anno: 1997,
pagine: 1545 - 1555
SICI:
0032-3861(1997)38:7<1545:DAOBOM>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONCENTRATED POLYMER SYSTEMS; INFRARED DICHROISM; AMORPHOUS POLYMERS; TUBE MODELS; DYNAMICS; BIREFRINGENCE; SCATTERING; MOTION; MELTS;
Keywords:
RELAXATION; POLYSTYRENE; STAR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
18
Recensione:
Indirizzi per estratti:
Citazione:
H.Z.Y. Han et al., "DRAWING AND ORIENTATION-RELAXATION BEHAVIOR OF MONODISPERSE LINEAR AND 3-ARM STAR POLYSTYRENES", Polymer, 38(7), 1997, pp. 1545-1555

Abstract

The drawing and orientation-relaxation behaviour of monodisperse linear and 3-arm star polystyrenes was studied as functions of temperature, strain-rate and relaxation-time. Differences in birefringence were found for linear and star polymer, with the same span molecular weight (M(s)), drawn to large strains above the glass transition temperature (T-g) for time-scales close to, or longer than, the chain retraction-time (tau(B)). There were also significant differences in birefringencebetween stars with different molecular weights. At T-g, for time-scales shorter than tau(B), birefringence was found to depend upon the polymer M(s) and not topology. Below T-g, birefringence was also found tobe independent of M(s). A comparison has been made between experimentand theory. (C) 1997 Elsevier Science Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 04:21:53