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Titolo:
MOLECULAR-DYNAMICS IN A MISCIBLE POLYESTER BLEND
Autore:
SPALL S; GOODWIN AA; ZIPPER MD; SIMON GP;
Indirizzi:
MONASH UNIV,DEPT MAT ENGN CLAYTON VIC 3168 AUSTRALIA MONASH UNIV,DEPT MAT ENGN CLAYTON VIC 3168 AUSTRALIA
Titolo Testata:
Journal of polymer science. Part B, Polymer physics
fascicolo: 14, volume: 34, anno: 1996,
pagine: 2419 - 2431
SICI:
0887-6266(1996)34:14<2419:MIAMPB>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
BINARY POLYMER BLENDS; OXIDE) (PPO)-POLY(STYRENE-CO-4-CHLOROSTYRENE) BLENDS; DIELECTRIC-RELAXATION; SEGMENTAL RELAXATION; GLASS-TRANSITION; CONCENTRATION FLUCTUATIONS; BISPHENOL-A; THERMORHEOLOGICAL COMPLEXITY; INTERMOLECULAR COOPERATIVITY; POLY(METHYL METHACRYLATE);
Keywords:
DIELECTRIC RELAXATION; THERMOPLASTIC BLEND; COUPLING; MISCIBLE BLEND; POLYESTER; POLYCARBONATE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
74
Recensione:
Indirizzi per estratti:
Citazione:
S. Spall et al., "MOLECULAR-DYNAMICS IN A MISCIBLE POLYESTER BLEND", Journal of polymer science. Part B, Polymer physics, 34(14), 1996, pp. 2419-2431

Abstract

The dynamic mechanical and dielectric spectra of a miscible polyesterand polycarbonate blend are investigated with emphasis on the latter technique. It was found that relaxation spectra for the blends from both techniques are broader than those of the constituent homopolymers. This is ascribed to greater intermolecular coupling and concentration fluctuations within the blends. The composition at which the greatest coupling occurs is dependent on the relaxation technique used and is skewed towards the component which shows the highest degree of intermolecular coupling. A number of parameters, such as relaxation time of the polymer molecules in the blend and relaxation strength, are comparedas a function of reduced temperature (experimental temperature scaledby the glass transition temperature). Whereas blend behavior is generally intermediate between that of the homopolymers, it appears as though mobility of compositions with low polyester content have a greater relaxation time and possess a higher activation energy when compared to a simple, weighted average of the corresponding homopolymer values. (C) 1996 John Wiley & Sons, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 07:37:52