An optical microscope equipped with a video photograph system was used to follow the growth of spherulites. Under nitrogen atmosphere, the growth rates at 290 and 300ΠC suggest that when the melt of PEEK has been equilibrated for 15 min at 400ΠC, the subsequent crystallization behavior was nearly in
Crystallization kinetics of polyaryl ether ketones
β Scribed by J. P. Jog; V. M. Nadkarnit
- Publisher
- John Wiley and Sons
- Year
- 1986
- Tongue
- English
- Weight
- 269 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0021-8995
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The isothermal melt and cold crystallization kinetics of poly(aryl ether ketone ether ketone ketone) are investigated by differential scanning calorimetry over two temperature regions. The Avrami equation describes the primary stage of isothermal crystallization kinetics with the exponent n Ο· 2 for
Nonisothermal melt and cold crystallization kinetics of poly(aryl ether ketone ether ketone ketone) (PEKEKK) were investigated by differential scanning calorimetry (DSC). The Avrami equation modified by Jeziorny could only describe the primary stage of nonisothermal crystallization kinetics of PEKEK
During cooling at a rate of 10Β°C/min from the melt state of PEEK we have followed the growth of spherulites using an optical microscope equipped with a camera. The isothermal growth rates of crystallization in the temperature range of 266 -308Β°C could be estimated by means of a differential equation
Linear polyaryl(ether ketones) containing tert-butyl pendent groups were prepared from aromatic hydrocarbons and aromatic diacid chlorides, both classes of monomers containing tert-butyl pendent groups. The polymers were prepared in high yield and high molecular weight by low-temperature precipitati