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Titolo:
CHARACTERIZATION OF POLY(SILYLENEMETHYLENE)S BY POSITRON-ANNIHILATIONLIFETIME SPECTROSCOPY - I
Autore:
OGAWA T; SUZUKI T; MURAKAMI M;
Indirizzi:
DOW CORNING ASIA LTD,RES CTR KANAGAWA 25801 JAPAN KEK IBARAKI OSAKA 305 JAPAN
Titolo Testata:
Journal of polymer science. Part B, Polymer physics
fascicolo: 5, volume: 36, anno: 1998,
pagine: 755 - 761
SICI:
0887-6266(1998)36:5<755:COPBP>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
MECHANICAL-PROPERTIES; RELAXATION PROCESSES; POLYETHYLENE; POLYSTYRENE; POLYMERS; POLY(DIARYLSILMETHYLENE)S; POLYPROPYLENE;
Keywords:
POSITRON ANNIHILATION LIFETIME SPECTROSCOPY; FREE VOLUME; TRANSITION TEMPERATURES; POLY(SILYLENEMETHYLENE)S; DYNAMIC MECHANICAL ANALYSIS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
T. Ogawa et al., "CHARACTERIZATION OF POLY(SILYLENEMETHYLENE)S BY POSITRON-ANNIHILATIONLIFETIME SPECTROSCOPY - I", Journal of polymer science. Part B, Polymer physics, 36(5), 1998, pp. 755-761

Abstract

Amorphous and crystalline poly( silylenemethylene)s with the repeating PhRSiCH2 (R : Me or Ph) units were characterized by positron annihilation lifetime spectroscopy (PALS) to gain insights into the molecularmotions of these polymers. The temperature dependence of the ortho-positronium lifetime (tau(3)) and intensity (I-3) was examined from 50 to 470 K for each sample. The glass transition temperature of each polymer was easily distinguished by a change in the slope of tau(3) spectrum. Both polymers exhibited a steep drop of I-3 at 130-140 K being probably assignable to the transition arising from the motions of phenyl groups, which was almost undetectable by means of differential scanning calorimetry or dynamic mechanical analysis. Several other transitions of these polymers detected by PALS are also discussed. (C) 1998 JohnWiley & Sons, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 08/04/20 alle ore 11:23:17