Thermally assisted self-healing polyurethane containing carboxyl groups

Self-healing polymers are a kind of intelligent materials with the capability to repair damage automatically. In a paper, a type of polyurethane containing carboxyl groups that demonstrates thermally assisted healing effects is reported.

Thermally assisted self-healing polyurethane containing carboxyl groups. Source: blueringmedia - Fotolia -

This polymer can be healed even 72 h after cutting and also has a repeatable healing property.

Efficiency can reach 90%

The self-healing efficiency can reach 90% when comparing the tensile strength of the healed sample to the original sample. Carboxyl content plays an important role in the self-healing property; polyurethane with no carboxyl groups cannot be healed. The mechanism of self-healing showed that hydrogen bonding interactions between carboxyl groups and diffusion of poly(ethylene glycol) chains contribute to the self-healing behaviour.

The study is published in: Applied Polymer Science.

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