Relaxation behavior in model compounds of poly(aryl-ether-ketone-ketone) as revealed by dielectric spectroscopy

Citation
Ta. Ezquerra et al., Relaxation behavior in model compounds of poly(aryl-ether-ketone-ketone) as revealed by dielectric spectroscopy, J CHEM PHYS, 110(20), 1999, pp. 10134-10140
Citations number
34
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF CHEMICAL PHYSICS
ISSN journal
00219606 → ACNP
Volume
110
Issue
20
Year of publication
1999
Pages
10134 - 10140
Database
ISI
SICI code
0021-9606(19990522)110:20<10134:RBIMCO>2.0.ZU;2-C
Abstract
The relaxation behavior of a series of ether-ketone oligomers, considered a s model compounds of poly(ether-ketone-ketone), was studied by means of die lectric spectroscopy. The dynamics of the a relaxation of ether-ketone mode l compounds as compared with that of poly(aryl-ether-ketone-ketone) (PEKK) (50/50), shows up differences which can be attributed to the variation of i nter- and intramolecular correlations with the chain length. Model compound s exhibit a nearly similar degree of cooperativity regardless the differenc es in T-g values. The PEKK (50/50) polymer exhibits stronger cooperativity than the oligomers suggesting that in poly(ether-ketone-ketone)s molecular motions above T-g extend to more than one monomeric unit. (C) 1999 American Institute of Physics. [S0021-9606(99)50620-8].