Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 168, Issue -, Pages 96-103Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2018.09.008
Keywords
Polymer-matrix composites; Smart materials; Delamination; High-temperature properties; Self-healing composites; High glass transition temperature
Categories
Funding
- Army Research Office [W911NF-12-1-0014]
- National Science Foundation [CMMI-1132416]
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Carbon fiber reinforced polymer (CFRP) composites were fabricated using a novel intrinsically healable isocyanurate-oxazolidone (ISOX) thermosetting matrix. After multiple delamination events, repeatable strength recovery of the composites has been demonstrated with a first healing efficiency up to 85% after thermal treatment. The healing mechanism results from transformation of the isocyanurate with epoxide groups to yield new oxazolidone rings at the fracture surface. This novel ISOX polymer utilizes commercial diglycidyl ether of bisphenol F (DGEBF) and toluene diisocyanate to produce a high cross-link density thermoset with a glass transition temperature (T-g) up to 285 degrees C, and 99.5% of the composite weight remains at 300 degrees C. The strength and stiffness of the composites are comparable with an engineering grade polymer matrix composite typically used in aerospace applications and the thermal stability places the materials in the polybismaleimide performance region although with greater toughness. This polymer exhibits the highest T-g of any self-healing material reported and is composed of low cost reactants, which gives the polymer great potential to function as a major component of an advanced structural composite for extreme environments.
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