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The diffusion of methylene chloride and tetrahydrofuran in amorphous poly(ether ether ketone) (PEEK) films was studied by the following method. A specimen was immersed in the solvent, the reaction was stopped by immersing the specimen in liquid nitrogen, the dried specimen was finally fractured into two pieces, one for observation under scanning electron microscope and the other for thermal analysis...
A 0.3 mm thick amorphous poly(ether ether ketone) (PEEK) film was exposed to acetone until equilibrium in the weight uptake was recorded, and was then dried in a vacuum oven at 70°C. The resulting structure was compared to the initial structure by means of differential scanning calorimetry (d.s.c.), wide-angle X-ray scattering (WAXS), small-angle X-ray scattering (SAXS), and infra-red (i.r.) spectroscopy...
The double endothermic behaviour of poly(aryl ether ether ketone) (PEEK) has been the subject of considerable debate during the last few years. In this paper, the various explanations for the double endothermic behaviour of PEEK are examined using a combination of real time small angle X-ray scattering (SAXS) and differential scanning calorimetry (d.s.c.) techniques. The correlation function approach...
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