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Bioinspired Healable Mechanochromic Function from Fluorescent Polyurethane Composite Film.

Xiaoke Song^1,2, Jun-Peng Wang¹, Yan Song¹

¹National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process Engineering, Chinese Academy of Sciences Beijing 100049 P. R. China.

|March 7, 2020

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Inspired by cephalopods, this study introduces a new healable mechanochromic (HMC) material. This material changes color with strain and self-repairs damage, offering dual functionality for advanced applications.

Area of Science:

Materials Science
Biomimetic Engineering
Polymer Chemistry

Background:

Cephalopods possess remarkable camouflage and wound healing abilities crucial for survival.
Developing materials with similar dual functionalities is of significant scientific interest.

Purpose of the Study:

To create a novel healable mechanochromic (HMC) material inspired by cephalopod functions.
To investigate the material's mechanochromic properties and self-healing capabilities.

Main Methods:

Synthesized a bifunctional HMC material with two distinct layers: a polyvinyl alcohol (PVA) and titanium dioxide (TiO2) shielding layer and a healable layer with supramolecular polymers and fluorochromes.
Characterized the material's mechanochromic response to strain and its healing efficiency under thermal conditions.

Keywords:

bifunction bioinspired materials healable mechanochromic

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Main Results:

The HMC material demonstrated tunable and reversible mechanochromic behavior due to strain-induced surface structuring.
The material exhibited efficient self-healing, with up to 98% healing efficiency achieved at 60°C for 6 hours.
The healing mechanism is attributed to the incorporated healable polyurethane component.

Conclusions:

A novel bioinspired HMC material with combined shielding, mechanochromic, and self-healing properties was successfully developed.
The material's tunable mechanochromic response and high healing efficiency suggest significant potential for applications in information encryption and flexible displays.