Influence of Flexible Amine Modifier on Mechanical Properties of Epoxy Resins
Epoxy resin structural adhesives modified by a flexible amine (D-230) were prepared by casting molding method. Dependence of the mechanical properties of epoxy resins on the flexible a-mine content was studied. The impact fracture toughness was discussed in terms of fracture surface fractography. The results showed that the fracture elongation at break at RT and the impact toughness at both RT and 77K increased with the increasing D-230 content, which demonstrated that the toughness of epoxy resin could be improved effectively by the addition of D-230. When the D-230 content was 21%(mass fraction), the epoxy resin at RT exhibited the highest tensile strength and Young's modulus, 85. 44 MPa and 3. 22GPa, respectively; afterwards, both the tensile strength and Young's modulus decreased with the increase of D-230 content. SEM analysis of tensile fracture sur-faces showed that the fractography tended to be irregular with the addition of flexible amine, indicating that the crack-resisting ability was improved. This result was consistent with the observation of higher fracture elongation and higher impact toughness. Thermal analysis of specimens showed that the glass transition temperature (Tg) decreased with increasing the D-230 content.
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维普
