Differential Scanning Calorimetry and Infrared Crystallinity Determinations of Poly(aryl Ether Ether Ketone)
(1991) Polymer — Vol. 32, n° 18, p. 3364-3370 (1991)
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- Abstract
- The differential scanning calorimetry (d.s.c.) heating thermograms of 12 poly(aryl ether ether ketone) (PEEK) samples of varying degrees of crystallinity have been recorded. The relation found between the degree of crystallinity as determined by specific gravity measurements, and the melting enthalpy of the polymer, shows that recrystallization is occurring during a heating scan rate of 10-degrees-C min-1. This implies that d.s.c. is not a convenient technique to assess PEEK crystallinity. The infra-red absorbance spectra of the same samples have also been examined in the range from 1030 to 880 cm-1. The 965 cm-1 band, up to now considered as indicative of the PEEK crystallinity, is shown to be practically independent of the degree of crystallinity above 15%. However, there is evidence to support the existence of a true i.r. crystalline band located at 947 cm-1. It is also suggested that the 965 cm-1 band is due to a normal vibration mode of a short segmental conformation, whose presence is favoured in the crystalline phase, but also in the amorphous zones nearest to the crystallite surface.
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Jonas, A., Legras, R., & Issi, JP. (1991). Differential Scanning Calorimetry and Infrared Crystallinity Determinations of Poly(aryl Ether Ether Ketone). Polymer, 32(18), 3364-3370. https://doi.org/10.1016/0032-3861(91)90540-Y (Original work published 1991)