Evaluation of crystallization kinetics of poly (ether-ketone-ketone) and poly (ether-ether-ketone) by DSC

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Data

2010

Autores

Vasconcelos, Gibran Da Cunha
Mazur, Rogerio Lago
Botelho, Edson Cocchieri
Rezende, Mirabel Cerqueira
Costa, Michelle Leali

Título da Revista

ISSN da Revista

Título de Volume

Editor

Departamento de Ciência e Tecnologia Aeroespacial

Resumo

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.

Descrição

Palavras-chave

Crystallinity, PEKK, PEEK, DSC

Como citar

Journal of Aerospace Technology and Management. Departamento de Ciência e Tecnologia Aeroespacial, v. 2, n. 2, p. 155-162, 2010.

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