Physics
Scientific paper
Jun 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..519...64e&link_type=abstract
STATISTICAL PHYSICS: Third Tohwa University International Conference. AIP Conference Proceedings, Volume 519, pp. 64-70 (2000).
Physics
Solid-Liquid Transitions, Dielectric Loss And Relaxation, Glass Transitions
Scientific paper
The relaxation behavior of a series of ether-ketone oligomers was studied by means of dielectric spectroscopy. In order to isolate chain stiffness from other intermolecular factors, we studied chemically homogeneous, strictly monodisperse, low molecular weight ether-ketone model compounds. The dynamics of the α relaxation of ether-ketone model compounds as compared with that of the homologous polymer PEKK (50/50), shows up differences which can be attributed to the variation of inter and intra molecular correlations with the chain length. Model compounds exhibit a nearly similar degree of cooperativity regardless the differences in Tg values. The PEKK(50/50) polymer exhibits stronger cooperativity than the oligomers suggesting that in poly(ether-ketone-ketone)s molecular motions above Tg extend to more than one monomeric unit. .
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