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Titolo:
Influence of strain on the thermal behaviour of poly(chlorotrifluoroethylene)
Autore:
Ramachandra, P; Ramani, R; Ramgopal, G; Shariff, G; Thimmegowda, MC; Sathyanarayana, PM; Ranganathaiah, C;
Indirizzi:
Univ Mysore, Dept Studies Phys, Mysore 570006, Karnataka, India Univ Mysore Mysore Karnataka India 570006 Mysore 570006, Karnataka, India
Titolo Testata:
POLYMER INTERNATIONAL
fascicolo: 1, volume: 48, anno: 1999,
pagine: 33 - 40
SICI:
0959-8103(199901)48:1<33:IOSOTT>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSITRON-ANNIHILATION SPECTROSCOPY; MECHANICAL-PROPERTIES; POLY(ETHYLENE-TEREPHTHALATE); STRESS; CRYSTALLIZATION; POLYETHYLENE; ORIENTATION; SHRINKAGE; FIBERS; FILMS;
Keywords:
poly(chlorotrifluoroethylene); positron lifetime; free volume; critical strain; activation energy;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Ranganathaiah, C Univ Mysore, Dept Studies Phys, Mysore 570006, Karnataka,India Univ Mysore Mysore Karnataka India 570006 rnataka, India
Citazione:
P. Ramachandra et al., "Influence of strain on the thermal behaviour of poly(chlorotrifluoroethylene)", POLYM INT, 48(1), 1999, pp. 33-40

Abstract

The effects of uniaxial drawing on the free volume of poly(chlorotrifluoroethylene) have been investigated using the positron annihilation lifetime technique. Annealing measurements were made both in unstrained and maximum strained conditions of the polymer to understand the influence of residual stress on the thermal behaviour. The results indicate uncoiling of the molecular chains upon stretching accompanied by orientation of the polymeric chains. The results further indicate an increase of the glass transition temperature of the drawn film and a negative thermal expansion beyond the glass transition temperature, supported by an increase in activation energy for the strained polymer. (C) 1999 Society of Chemical Industry.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 08:58:48