It is still challenging and attractive to prepare polyurethane
(PU) materials with excellent self-healing ability while improving
their mechanical properties and high ductility. Here, a multifunctional
linear PU supramolecular elastomer was successfully prepared by introducing
a cross-linking network of quadruple hydrogen bonds and thermo-reversible
Diels–Alder bonds and rigid ring structure to the linear backbone.
The results exhibited that the obtained PU elastomer displayed a high
tensile strength (6.30 MPa), elongation (1957.84%), toughness (84.48
MJ/m3), and excellent repair efficiency (93.33%). The quadruple
hydrogen bonds from 5-(2-hydroxyethyl)-6-methyl-2-aminouracil and
thermo-reversible Diels–Alder bonds from the conjugated reaction
of 4,4′-bismaleimide diphenylmethane with furfuryl alcohol,
due to its synergetic dual reversible bonds, formed the PU elastomer
that possessed excellent mechanical, self-healing, shape recovery,
and reprocessing properties. The prepared multifunctional PU can be
used as a substrate for flexible conductive materials or as conductive
composite material with conductive materials, which can self-repair
many times when the surface is damaged, can be recycled, and greatly
improve the service life of the material. Therefore, the prepared
multifunctional high-performance self-healing PU materials have potential
applications in several fields.
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