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Mechano-responsive hydrogen-bonding array of thermoplastic polyurethane elastomer captures both strength and self-healing.

Abstract：

:Self-repairable materials strive to emulate curable and resilient biological tissue; however, their performance is currently insufficient for commercialization purposes because mending and toughening are mutually exclusive. Herein, we report a carbonate-type thermoplastic polyurethane elastomer that self-heals at 35 °C and exhibits a tensile strength of 43 MPa; this elastomer is as strong as the soles used in footwear. Distinctively, it has abundant carbonyl groups in soft-segments and is fully amorphous with negligible phase separation due to poor hard-segment stacking. It operates in dual mechano-responsive mode through a reversible disorder-to-order transition of its hydrogen-bonding array; it heals when static and toughens when dynamic. In static mode, non-crystalline hard segments promote the dynamic exchange of disordered carbonyl hydrogen-bonds for self-healing. The amorphous phase forms stiff crystals when stretched through a transition that orders inter-chain hydrogen bonding. The phase and strain fully return to the pre-stressed state after release to repeat the healing process.

journal_name

Nat Commun

journal_title

Nature communications

authors

Eom Y,Kim SM,Lee M,Jeon H,Park J,Lee ES,Hwang SY,Park J,Oh DX

doi

10.1038/s41467-021-20931-z

subject

Has Abstract

pub_date

2021-01-27 00:00:00

pages

621

issue

1

issn

2041-1723

pii

10.1038/s41467-021-20931-z

journal_volume

12

pub_type

杂志文章

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