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Chemo-Mechanical Analysis of Bifunctional linear DGEBF/Aromatic Amino Resin Casting Systems  

Lee Jae-Rock (한국화학연구소 화학소재연구단)
Myung In-Ho (국방품질관리소 서울분소)
Publication Information
Composites Research / v.18, no.4, 2005 , pp. 14-20 More about this Journal
Abstract
To determine the effect of chemical structure of aromatic amino curing agents on thermal and mechanical properties, standard epoxy resin DGEBF (diglycidylether of bisphenol F) was cured with diaminodiphenyl methane (DDM) and diaminodiphenyl sulphone (DDS) in a stoichiometrically equivalent ratio. From this work the effect of aromatic amino curing agents on the thermal and mechanical properties is significantly influenced by the chemical structure of curing agents. In contrast, the results show that the DGEBF/DDS system having the sulfone structure between the benzene rings had higher values in the thermal stability, density, shrinkage ($\%$), thermal expansion coefficient, tensile modulus and strength, flexural modulus and strength than the DGEBF/DDM system having methylene structure between the benzene rings, whereas the DGEBF/DDS system presented low values in maximum exothermic temperature, conversion of epoxide, and grass transition temperature. These results are caused by the relative effects of sulfone group having strong electronegativity and methylene group having (+) repulsive property. The result of fractography shows that the grain distribution of DGEBF/DDS system is more irregular than that of the DGEBF/DDM system.
Keywords
DGEBF; DDM; DDS; thermal properties; mechanical properties;
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