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Fluid sorption characterization of PEEK matrices and composites
Author(s) -
Stober Eric J.,
Seferis James C.
Publication year - 1988
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760280912
Subject(s) - peek , sorption , crystallinity , materials science , penetrant (biochemical) , composite material , amorphous solid , kinetics , polymer chemistry , chemical engineering , polymer , organic chemistry , chemistry , physics , adsorption , quantum mechanics , engineering
Neat poly(ether‐ether‐ketone) (PEEK) and carbon fiber reinforced PEEK (APC‐2) specimens were prepared using a variety of cooling rates to achieve a range of crystallinities. Amorphous specimens were exposed to a variety of fluids to determine the penetrant types which are able to strongly influence the material. This allowed the estimation of the solubility parameter and hydrogen bonding index for PEEK to be 9.5 and 3.1, respectively. Methylene chloride was used to investigate the kinetics of penetrant sorption. The data demonstrated Case II behavior, with the initial crystallinity having a pronounced effect on both the kinetic and equilibrium data. Accordingly, a model was proposed capable of describing the sorption level and penetration depth as a function of time given the sample crystallinity and sorption temperature. With Case II behavior there was no difference in the sorption kinetics of neat and fiber reinforced PEEK. Finally, the dynamic mechanical properties measured during sorption were found to be dependent on the sorption process.