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An efficient healing agent for high temperature epoxy composites based upon tetra-glycidyl diamino diphenyl methane
journal contribution
posted on 2015-11-01, 00:00 authored by K Pingkarawat, C Dell'Olio, Russell VarleyRussell Varley, A P MouritzPoly(ethylene-co-methacrylic acid) (EMAA) as a thermally activated healing agent in a high performance, high temperature tetra-glycidyl methylene dianiline (TGDDM)/diethyl toluene diamine (DETDA) mendable epoxy composite is reported for the first time. Despite curing above EMAAs melting point (Tm = 85 °C), healing occurred by incorporating a preliminary low temperature curing step of 5 h at 80 °C, prior to cure at 177 °C. Healing occurred via the pressure delivery mechanism derived from tertiary amine catalysed surface condensation reactions between EMAA and hydroxyl groups from the epoxy resin. Healing efficiencies of 36%, 55% and 105% were achieved after heating at 150 °C, 200 °C and 230 °C respectively, but decreased rapidly with continued healing. Healing at 150 °C and 200 °C revealed significant healing despite remaining in the glassy state. In addition, EMAA enhanced mode I interlaminar fracture toughness by more than 270% for both the DETDA and 4,4-DDS networks.
History
Journal
Composites Part A: applied science and manufacturingVolume
78Pagination
201 - 210Publisher
ElsevierLocation
Doetinchem, The NetherlandsPublisher DOI
ISSN
1359-835XeISSN
1878-5840Language
engPublication classification
C Journal article; C1.1 Refereed article in a scholarly journalCopyright notice
2015, ElsevierUsage metrics
Categories
Keywords
smart materialspolymer-matrix composites (PMCs)fracture toughnesshigh temperature propertiesScience & TechnologyTechnologyEngineering, ManufacturingMaterials Science, CompositesEngineeringMaterials ScienceRESINFRACTUREDAMAGEEMAAPOLYETHERIMIDEMECHANISMSPOLYMERSCRACKSAerospace EngineeringMechanical Engineering
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