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Titolo:
Quantitative relation between shear history and rheological properties of LDPE
Autore:
Yamaguchi, M; Gogos, CG;
Indirizzi:
New Jersey Inst Technol, Inst Polymer Proc, Newark, NJ 07102 USA New Jersey Inst Technol Newark NJ USA 07102 er Proc, Newark, NJ 07102 USA Tosoh Corp, Yokkaichi Res Lab, Yokkaichi, Mie 5108540, Japan Tosoh Corp Yokkaichi Mie Japan 5108540 Lab, Yokkaichi, Mie 5108540, Japan
Titolo Testata:
ADVANCES IN POLYMER TECHNOLOGY
fascicolo: 4, volume: 20, anno: 2001,
pagine: 261 - 269
SICI:
0730-6679(200124)20:4<261:QRBSHA>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
LOW-DENSITY POLYETHYLENE; CONSTITUTIVE-EQUATIONS; BRANCHED POLYMERS; MELT; SCATTERING; BLENDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Yamaguchi, M New Jersey Inst Technol, Inst Polymer Proc, Newark, NJ 07102 USA New Jersey Inst Technol Newark NJ USA 07102 rk, NJ 07102 USA
Citazione:
M. Yamaguchi e C.G. Gogos, "Quantitative relation between shear history and rheological properties of LDPE", ADV POLY T, 20(4), 2001, pp. 261-269

Abstract

The role of the applied processing equipment shear history on the rheological properties of low-density polyethylene was studied in detail. It was found that the shear history depresses the melt strength and the oscillatory shear modulus, especially the storage modulus in low frequency region. Thisphenomenon is not caused by lowering of the molecular weight, which remained the same as the original, for all shear history samples, indicating absence of mechanical/thermal degradation during processing. Furthermore, annealing the melt processed samples enhances both the melt strength and the oscillatory modulus to the values of the original, unsheared sample. Finally we applied shear history in a cone-and-plate rheometer and found that the growth curve of the storage modulus, which can be expressed by a simple equation, is determined by both the duration of the flow and the magnitude of the applied shear stress. (C) 2001 John Wiley & Sons, Inc.

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Documento generato il 29/09/20 alle ore 09:08:06