Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 104, Issue -, Pages 40-46Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2014.08.028
Keywords
Polymer-matrix composites (PMCs); Smart materials; Mechanical properties
Categories
Funding
- Natural Science Foundation of China [51273214, 51333008]
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Self-healing system with ultrafast speed and heat-resistance is highly desired in development of intelligent high performance polymer composites. In this work, trifluoromethanesulfonic acid (TfOH), an ultrastrong Bronsted acid, is successfully encapsulated in silica microspheres, which cooperates with epoxy monomer, forming a group of novel self-healing agent having practical value. Impact and fatigue tests demonstrate that mechanical strength of epoxy composite filled with low loading level of microencapsulated epoxy monomer and TfOH can be recovered within seconds at room temperature without manual intervention. Moreover, the present healing system is low-toxic and has acquired significant thermal stability. It can survive the rigorous processing of high T-g epoxy (>240 degrees C) during composite fabrication and provides the composite that was pre-treated at 180 degrees C for 5 h with the same healing efficiency as the untreated one. We believe that this work expands the spectrum of self-healing strategies and facilitates future applications. (C) 2014 Elsevier Ltd. All rights reserved.
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