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Titolo:
THERMAL-BEHAVIOR OF FLUORINATED AROMATIC POLYETHERS AND POLY(ETHER KETONE)S
Autore:
GOODWIN AA; MERCER FW; MCKENZIE MT;
Indirizzi:
MONASH UNIV,DEPT MAT ENGN CLAYTON VIC 3168 AUSTRALIA RAYCHEM CORP,RES & DEV MENLO PK CA 94025
Titolo Testata:
Macromolecules
fascicolo: 9, volume: 30, anno: 1997,
pagine: 2767 - 2774
SICI:
0024-9297(1997)30:9<2767:TOFAPA>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
ETHER ETHER KETONE); GLASS-TRANSITION; SECONDARY RELAXATION; MOLECULAR MOBILITY; DECAY FUNCTION; BISPHENOL; POLYARYLS; MOTIONS; PEEK;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
46
Recensione:
Indirizzi per estratti:
Citazione:
A.A. Goodwin et al., "THERMAL-BEHAVIOR OF FLUORINATED AROMATIC POLYETHERS AND POLY(ETHER KETONE)S", Macromolecules, 30(9), 1997, pp. 2767-2774

Abstract

Eight amorphous polyethers and poly(ether ketones) were synthesized and characterized by gel permeation chromatography, thermogravimetric analysis, differential scanning calorimetry, and dynamic mechanical thermal analysis. Polymers containing bulky, cyclic 2,2'-biphenyl side groups were found to have the highest glass transition temperatures, were more thermally stable and exhibited the highest intramolecular barriers to rotation. Incorporation of perfluorophenylene groups resulted in internal plasticisation and a relative lowering of T-g. The steepness of cooperativity plots determined from Williams-Landel-Ferry shift factors correlated with the rigid nature of the polymer chains, but notwith the broadness of the relaxation (characterized by the Kohlrausch-Williams-Watts stretch exponent beta) as predicted by the coupling model. A beta-process observed in the polymers containing cyclic biphenyl side groups was similar in appearance to a typical ''structural'' relaxation. The position, intensity, and breadth of the gamma-process was sensitive to chemical structure and absorbed moisture.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 07:40:15