Evaluation of crystallization kinetics of poly (ether-ketone-ketone) and poly (ether-ether-ketone) by DSC
doi: 10.5028/jatm.2010.02026310

Gibran da Cunha Vasconcelos
Univ. Estadual Paulista
Guaratinguetá – Brazil
mat06070@feg.unesp.br

Rogerio Lago Mazur
Univ. Estadual Paulista
Guaratinguetá – Brazil
rogermaz@uol.com.br

Edson Cocchieri Botelho
Univ. Estadual Paulista
Guaratinguetá – Brazil
ebotelho@feg.unesp.br

Mirabel Cerqueira Rezende
Institute of Aeronautics and Space
São José dos Campos- Brazil
mirabel@iae.cta.br

Michelle Leali Costa*
Univ. Estadual Paulista
Guaratinguetá – Brazil
michelle@feg.unesp.br

*author for correspondence

Abstract:

The poly (aryl ether ketones) are used as matrices in advanced composites with high performance due to its high thermal stability, excellent environmental performance and superior mechanical properties. Most of the physical, mechanical and thermodynamic properties of semi-crystalline polymers depend on the degree of crystallinity and morphology of the crystalline regions. Thus, a study on the crystallization process promotes a good prediction of how the manufacturing parameters affect the developed structure, and the properties of the final product. The objective of this work was to evaluate the thermoplastics polymers PEKK e PEEK by DSC, aiming to obtain the relationship between kinetics, content, nucleation and geometry of the crystalline phases, according to the parameters of the Avrami and Kissinger models. The analysis of the Avrami exponents obtained for the studied polymers indicates that both showed the formation of crystalline phases with heterogeneous nucleation and growth geometry of the type sticks or discs, depending on the cooling conditions. It was also found that the PEEK has a higher crystallinity than PEKK.

Keywords:

Crystallinity, PEKK, PEEK, DSC.

J. Aerosp.Technol. Manag., São José dos Campos, Vol.2, No.2, pp. 155-162, May-Aug., 2010
Received: 01/04/10
Accepted: 20/04/10