SciELO - Scientific Electronic Library Online

 
vol.10 número4Embranquecimento do polipropileno isotático injetado contendo TiO2 como pigmentoEstudo da influência dos iniciadores na polimerização da 2-fenil-2-oxazolina índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Polímeros

versão impressa ISSN 0104-1428versão On-line ISSN 1678-5169

Resumo

GONZALEZ GARCIA, Filiberto  e  GALEGO FERNANDEZ, Norma. The curing reaction of diglycidyl ether of bisphenol-A (DGEBA) and diethylentriamine system studied by differencial scanning calorimetry. Polímeros [online]. 2000, vol.10, n.4, pp.218-223. ISSN 1678-5169.  http://dx.doi.org/10.1590/S0104-14282000000400009.

The curing reaction of diglycidyl ether of bisphenol-A (DGEBA) and diethylentriamine (DETA) system was studied by differential scanning calorimetry (DSC). Different kinetics expressions were found by isothermal and dynamic experiments that they justify mechanism changes with the temperature. The reaction follows a second order kinetics and has activation energy of 90 kJ mol-1 at high temperatures (non-catalytic mechanism). The kinetics of the reactions at low temperatures manifested the existence of two competitive mechanisms, the constants rate were determined at 60 and 70°C and has activation energy in the range of 56.9 to 63.0 kJ mol-1 that is in perfect agreement with the reported to low temperatures (autocatalytic mechanism ).

Palavras-chave : Diglycidyl ether of bisphenol-A; diethylentriamine; curing reaction; differencial scanning calorimetry.

        · resumo em Espanhol     · texto em Espanhol     · Espanhol ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons