Influence of cross-linkers on the cohesive and adhesive self-healing ability of polysulfide-based thermosets.
Synthetic systems with intrinsic self-repairing or self-healing abilities have emerged during the past decade. In this work, the influence of the cross-linker and chain rigidity on the healing ability of thermoset rubbers containing disulfide bonds have been investigated. The produced materials exhibit adhesive and cohesive self-healing properties. The recovery of these two functionalities upon the thermally triggered healing events has shown to be highly dependent on the network cross-link density and chain rigidity. As a result, depending on the rubber thermoset intrinsic physical properties, the thermal mending leading to full cohesive recovery can be achieved in 20-300 min at a modest healing temperature of 65 °C. The adhesive strength ranges from 0.2 to 0.5 MPa and is fully recovered even after multiple failure events.
Material Innovation Institute, Mekelweg 2, 2600 GA, Delft, The Netherlands. U.Lafont@tudelft.nl
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Lafont
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van Zeijl
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van der Zwaag
D000268:Adhesiveness; D000269:Adhesives / Q000737:chemistry*; D003432:Cross-Linking Reagents / Q000737:chemistry*; D006244:Hardness; D006358:Hot Temperature; D008422:Materials Testing; D013440:Sulfides / Q000737:chemistry*; D013696:Temperature
D000269:Adhesives; D003432:Cross-Linking Reagents; D013440:Sulfides