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Titolo:
An experimental study of the occupied volume in polyethylene terephthalate
Autore:
Consolati, G; Quasso, F;
Indirizzi:
Politecn Milan, Dipartimento Fis, Ist Nazl Fis Mat, I-20133 Milan, Italy Politecn Milan Milan Italy I-20133 st Nazl Fis Mat, I-20133 Milan, Italy
Titolo Testata:
JOURNAL OF CHEMICAL PHYSICS
fascicolo: 6, volume: 114, anno: 2001,
pagine: 2825 - 2829
SICI:
0021-9606(20010208)114:6<2825:AESOTO>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSITRON-ANNIHILATION LIFETIME; TEMPERATURE-DEPENDENCE; POLYCARBONATE; DYNAMICS; POLYMERS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Consolati, G Politecn Milan, Dipartimento Fis, Ist Nazl Fis Mat, Piazza Leonardo da Vinci 32, I-20133 Milan, Italy Politecn Milan Piazza Leonardo da Vinci 32 Milan Italy I-20133
Citazione:
G. Consolati e F. Quasso, "An experimental study of the occupied volume in polyethylene terephthalate", J CHEM PHYS, 114(6), 2001, pp. 2825-2829

Abstract

Combined use of positron annihilation lifetime spectroscopy-an experimental tool to investigate the intermolecular sub-nanometric spaces (free volume) in polymers-and of specific volume data supply unique information on the occupied volume in a semicrystalline polymer-poly(ethylene terephthalate)-,in particular, on its thermal behavior. From our data an expansion coefficient for the occupied volume alpha (o) = 2.9.10(-5) K-1 is obtained, when the dependence of ortho-positronium intensity on the temperature is taken into account. The free volume fraction at the glass transition temperature results f = 0.04, in agreement with analogous estimates in other semicrystalline polymers. (C) 2001 American Institute of Physics.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/04/20 alle ore 04:11:42