An efficient healing agent for high temperature epoxy composites based upon tetra-glycidyl diamino diphenyl methane. (November 2015)

• Record Type: Journal Article
• Authors: Pingkarawat, K.; Dell'Olio, C.; Varley, R.J.; Mouritz, A.P.
• Is Part Of: Composites. Volume 78(2015)
• Page Start: 201
• Page End: 210
• Publication Date: 2015-11
• Subjects: A. Smart materials -- A. Polymer-matrix composites (PMCs) -- B. Fracture toughness -- B. High temperature properties; Composite materials -- Periodicals; Manufacturing processes -- Periodicals; Composite materials; Manufacturing processes; Periodicals; 620.11805
• DOI: 10.1016/j.compositesa.2015.08.007
• Languages: English
• ISSNs: 1359-835X

Abstract

Abstract: Poly(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 ( T m = 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.