An efficient healing agent for high temperature epoxy composites based upon tetra-glycidyl diamino diphenyl methane

作者：Pingkarawat K; Dell'Olio C; Varley R J^*; Mouritz A P

来源：Composites Part A: Applied Science and Manufacturing , 2015, 78: 201-210.

DOI：10.1016/j.compositesa.2015.08.007

• Smart materials
• Polymer-matrix composites (PMCs)
• Fracture toughness
• High temperature properties

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 degrees C), healing occurred by incorporating a preliminary low temperature curing step of 5 h at 80 degrees C, prior to cure at 177 degrees 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 degrees C, 200 degrees C and 230 degrees C respectively, but decreased rapidly with continued healing. Healing at 150 degrees C and 200 degrees C revealed significant healing despite remaining in the glassy state. In addition, EMAA enhanced model interlaminar fracture toughness by more than 270% for both the DETDA and 4,4-DDS networks.

• 出版日期2015-11
• 单位CSIRO