Thermal-stability and Crystallization of Poly(aryl Ether Ether Ketone)
(1991) Polymer — Vol. 32, n° 15, p. 2691-2706 (1991)
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- The molecular weight distribution of poly(aryl ether ether ketone) (PEEK) has been measured as a function of the melt holding temperature and time in air and in an inert environment. A branching mechanism was observed to occur in the usual melt processing conditions, which was much stronger in air than in vacuum or nitrogen. This degradation mechanism is correlated to a volatile emission observed with thermogravimetric analysis. The influence of the degradation on the PEEK crystallization is discussed. A considerable decrease in crystallization rate is observed associated with the decreased molecular mobility due to the molecular weight increase. and a crystallinity decrease associated with the structural defects introduced along the chains by the branching process. The self-nucleation in PEEK has also been examined through optical microscopy. It was concluded that to get rid of the self-nucleation phenomenon, it is necessary to bring the polymer to temperatures where degradation is already present.
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Jonas, A., & Legras, R. (1991). Thermal-stability and Crystallization of Poly(aryl Ether Ether Ketone). Polymer, 32(15), 2691-2706. https://doi.org/10.1016/0032-3861(91)90095-Z (Original work published 1991)