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- W2034456728 endingPage "4550" @default.
- W2034456728 startingPage "4544" @default.
- W2034456728 abstract "Kinetics of lamellar microstructure development of poly(aryl ether ether ketone) (PEEK), poly(aryl ether ketone ketone) containing 70% isophthalate moieties (PEKK(30/70)) and their 50/50 blend during isothermal crystallization and subsequent melting have been studied by DSC, transmitted light intensity, and time-resolved small-angle X-ray scattering (SAXS). The crystallization peak time, spherulite growth rate, and dimensions of lamellar stacks (long period L, crystal lamellar thickness lc and amorphous layer thickness la) were determined. It was found that there is a remarkable difference in the crystallization kinetics of pure PEEK and PEKK(30/70). In the blend, the addition of PEKK(30/70) significantly reduces the crystallization rate of PEEK, resulting in a peak time intermediate between the two neat materials. A two-step behavior was observed during isothermal crystallization and subsequent melting processes in the blend by both transmitted light intensity and time-resolved SAXS techniques. Results show no sign of cocrystallization or epitaxial growth between the crystals of PEEK and PEKK(30/70) rather than the coexistence of two separate lamellar structures (PEEK and PEKK(30/70)) in the same spherulites. It is thus concluded that during crystallization, PEEK spherulites formed first followed by the infilling of PEKK(30/70) crystals within these spherulites." @default.
- W2034456728 created "2016-06-24" @default.
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- W2034456728 date "1997-08-01" @default.
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- W2034456728 title "Dynamic Study of Crystallization- and Melting-Induced Phase Separation in PEEK/PEKK Blends" @default.
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- W2034456728 doi "https://doi.org/10.1021/ma970092l" @default.
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