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7. Apr 2021 | Production & Lab

Self-healable and stretchable polyurethane film

A new paper reports a waterborne polyurethane film fabricated via multiple hydrogen bonds that is both room‐temperature self-healable and stretchable.
A cut healed completely at room temperature in one week.
Image source: kwanchaift - (symbol image).

A simple strategy is reported for preparing self-healable cationic waterborne polyurethane (WPU/TAx), in which cross-links are formed via hydrogen bonds between tannic acid (TA) and the rigid domains of linear WPU.

The cut could be able to completely heal in air condition at room temperature in one week without any external stimulation. The healing time can be largely reduced to 3 h when the cut sample are treated at 50 °C.

The rigid domain’s containing multiple types of H-bonds classified as ordered H-bonds and disordered bonds is the main reason for the self-healing property, which is supported by Infrared spectrum.

Improved mechanical properties

These H-bonds are also responsible for greatly improved mechanical properties of WPU. The maximum tensile strength and elastic modulus of WPU/TA5.1 are twice and 2.5 times that of pure WPU respectively, up to 32 MPa and 2.44 MPa. The combination of enhanced mechanical properties and self-healing in moderate conditions is achieved by just simply mixing WPU dispersion and tannic acid aqueous solution.

The study has been published in Progress in Organic Coatings, Volume 151, February 2021.

EC Library Polyurethanes



The chemistry of polyurethane coatings is of great significance in many applications worldwide. Moreover, their development potential has yet to be exhausted by any means. New applications are being identified and the product range will be further development. The book provides a comprehensive overview of the chemistry and the various possible application fields of polyurethanes. It starts by illustrating the principles of polyurethane chemistry, enabling the reader to understand the current significance of many applications and special developments. Newcomers learn about the key concepts of polyurethane chemistry and the main application technologies, while experienced specialists will value the insights on current trends and changes.

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