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Titolo:
MOLECULAR MOBILITY OF SUBSTITUTED POLY(P-PHENYLENES) CHARACTERIZED BYA RANGE OF POLYMER RELAXATION TECHNIQUES
Autore:
SIMON GP; ARDI MS; GOODWIN AA; ZIPPER MD; ANDREWS SR; SHINTON S; WILLIAMS G; GALOP M; TRIMMER M;
Indirizzi:
MONASH UNIV CLAYTON VIC 3168 AUSTRALIA UNIV COLL SWANSEA,DEPT CHEM SWANSEA SA2 8PP W GLAM WALES THERMOLD STAMFORD CT 06906 MAXDEM INC SAN DIMAS CA 91773
Titolo Testata:
Journal of polymer science. Part B, Polymer physics
fascicolo: 9, volume: 36, anno: 1998,
pagine: 1465 - 1481
SICI:
0887-6266(1998)36:9<1465:MMOSPC>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSITRON-ANNIHILATION; FREE-VOLUME; DIELECTRIC-RELAXATION; VISCOELASTIC PROPERTIES; AMORPHOUS POLYMERS; SPECTROSCOPY; DEPENDENCE; POLYMETHACRYLATES; POLYACRYLATES;
Keywords:
POLY(PHENYLENE); DIELECTRIC; DYNAMIC MECHANICAL; RELAXATION; FREE VOLUME; POSITRON ANNIHILATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
45
Recensione:
Indirizzi per estratti:
Citazione:
G.P. Simon et al., "MOLECULAR MOBILITY OF SUBSTITUTED POLY(P-PHENYLENES) CHARACTERIZED BYA RANGE OF POLYMER RELAXATION TECHNIQUES", Journal of polymer science. Part B, Polymer physics, 36(9), 1998, pp. 1465-1481

Abstract

The free volume and related mobility properties of substituted poly(p-phenylene) polymers are examined. The techniques used range from positron annihilation, dielectric relaxation, and dynamic mechanical spectroscopy to thermally stimulated currents. Fractional free volume is determined for the samples with different substituted side groups and related to the glass transition temperature. Bulkier groups lead to a greater fractional free volume and lower glass transition temperatures. Comparison of molecular relaxation times using the different characterization techniques demonstrates that there is strong coupling between motion of the main chain and the side groups, on which the dipoles reside. Intermolecular coupling between the main chains at the primary relaxation is shown in this work to be related to the nature of the sidechains and resultant free volume, as are the temperature locations oflocal, secondary relaxations. A qualitative model describing the effect of regiochemistry on the motions and packing of these materials is also proposed. (C) 1998 John Wiley & Sons, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 15:56:43