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Isothermal crystallization kinetics of PEEK/Vectra® blends by DSC and time‐resolved synchrotron X‐ray diffraction
Author(s) -
Naffakh M.,
Gómez M. A.,
Ellis G.,
Marco C.
Publication year - 2006
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.20619
Subject(s) - peek , materials science , crystallization , differential scanning calorimetry , crystallinity , isothermal process , chemical engineering , polymer chemistry , composite material , polymer , thermodynamics , physics , engineering
Thermal properties of blends of poly(aryl ether ether ketone), PEEK, with a thermotropic liquid crystalline polymer, Vectra®, were investigated by differential scanning calorimetry and X‐ray diffraction techniques. Isothermal crystallization experiments were performed over a wide range of crystallization temperatures and compositions to follow the effect of Vectra® content on the crystallization kinetics of PEEK. A reduction in the crystallization rate of PEEK was related to a change in the mechanism of crystallization of PEEK, controlled in turn by the concentration of Vectra® in the blend. The addition of Vectra® resulted in a significant enhancement in the crystallization rate of PEEK. In addition, a reduction in this parameter is shown at a blend of 30% of Vectra®. Differences in the crystallization behavior of PEEK are related to structural properties of these systems measured by simultaneous real time WAXS and SAXS experiments using synchrotron radiation. Results of melting behavior of PEEK, subsequent to isothermal crystallization, were interpreted based on the effects of Vectra® on the formation of two crystal families of PEEK. Melting temperatures of PEEK and crystallinity calculated from double endotherm are influenced by blending. POLYM. ENG. SCI., 46:1411–1418, 2006. © 2006 Society of Plastics Engineers