Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 60: Issue 2
Physical Aging of a Tetrafunctional/phenol Novolac Epoxy Mixture Cured with Diamine. DSC and DMA measurements
Authors:
L. Barral Universidad de A Coruńa E. U. P. Ferrol, Departamento de Física Cra. Aneiros s/n 15405 Ferrol Spain Cra. Aneiros s/n 15405 Ferrol Spain

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J. Cano Universidad de A Coruńa E. U. P. Ferrol, Departamento de Física Cra. Aneiros s/n 15405 Ferrol Spain Cra. Aneiros s/n 15405 Ferrol Spain

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J. López Universidad de A Coruńa E. U. P. Ferrol, Departamento de Física Cra. Aneiros s/n 15405 Ferrol Spain Cra. Aneiros s/n 15405 Ferrol Spain

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I. López-Bueno Universidad de A Coruńa E. U. P. Ferrol, Departamento de Física Cra. Aneiros s/n 15405 Ferrol Spain Cra. Aneiros s/n 15405 Ferrol Spain

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P. Nogueira Universidad de A Coruńa E. U. P. Ferrol, Departamento de Física Cra. Aneiros s/n 15405 Ferrol Spain Cra. Aneiros s/n 15405 Ferrol Spain

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M. Abad Universidad de A Coruńa E. U. P. Ferrol, Departamento de Física Cra. Aneiros s/n 15405 Ferrol Spain Cra. Aneiros s/n 15405 Ferrol Spain

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C. Ramírez Universidad de A Coruńa E. U. P. Ferrol, Departamento de Física Cra. Aneiros s/n 15405 Ferrol Spain Cra. Aneiros s/n 15405 Ferrol Spain

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Pages:
391–399
Online Publication Date:
16 Aug 2006
Publication Date:
01 May 2000
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1010125022491
Keywords:
DMA; DSC; physical aging; TGDDM epoxy
Restricted access

Abstract  

The physical aging of a system containing tetraglycidyl-4-4′-diaminodiphenylmethane (TGDDM), with a multifunctional novolac glycidyl ether resin hardened by 4,4′-diaminodiphenylsulphone (DDS) has been investigated by differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). Samples fully cured were aged at temperatures between 200 and 250C, during periods of time from 1 to a maximum of 336 h. Furthermore, the dynamic mechanical relaxation behaviour annealed at temperature of 220C, was studied, aging during 24 and 168 h. The effect of the enthalpy relaxation during DSC heating scan is shown by the presence of an endothermic peak whose position and intensity depends on the aging conditions, both temperature and time. DSC studies suggest that enthalpy relaxation increases gradually with aging time to a limiting value for each temperature where structural equilibrium is reached. DMA results show that the effect of aging is to cause chain stiffening and a decrease in the height of the peak value of the loss factor.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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