Imidazolium ionic liquids as fracture toughening agents in DGEBA-TETA epoxy resin

• Autor(a) principal: Fonseca, Eduardo
• Data de Publicação: 2020
• Outros Autores: Silva, Vinícius Demétrio da, Klitzke, Joice Sandra, Schrekker, Henri Stephan, Amico, Sandro Campos
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRGS
• Texto Completo: http://hdl.handle.net/10183/220430
• topic: Resina epóxi; Líquidos iônicos; Resistência à fratura; Crosslink density; Imidazolium salt; Bisphenol A; Curing agent

Although epoxy resins are used in a broad variety of applications due to their good mechanical and thermal properties, their low fracture toughness is a limitation, exhibiting brittle behavior. This study explored the potential use of imidazolium ionic liquids (IL) as toughening agents for epoxy resin based on diglycidyl ether of bisphenol A (DGEBA) with triethylenetetramine (TETA) as curing agent. Fracture toughness was evaluated for DGEBA-TETA epoxy resins with eleven imidazolium IL and the best results were found for the IL with the chloride anion and the shortest N-alkyl side chain, C4MImCl. The use of 1.0 phr of C4MImCl lead to the reduction of the crosslink density of the post-cured resin, resulting in the increase of 25.5% in stress intensity factor and 8.2% in tensile strength with no significant loss in other mechanical properties.