File(s) under permanent embargo

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

journal contribution
posted on 01.11.2015, 00:00 authored by K Pingkarawat, C Dell'Olio, Russell VarleyRussell Varley, A P Mouritz
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 (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 manufacturing

Volume

78

Pagination

201 - 210

Publisher

Elsevier

Location

Doetinchem, The Netherlands

ISSN

1359-835X

eISSN

1878-5840

Language

eng

Publication classification

C Journal article; C1.1 Refereed article in a scholarly journal

Copyright notice

2015, Elsevier