Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 41, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202105315
Keywords
chiral helical polymers; chiral superstructures; handedness switching; spin-coating; stretchable thin films
Categories
Funding
- National Natural Science Foundation of China [51973011, 21774009, 21474007]
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A new method using chiral polyacetylene and thermoplastic polyurethane to prepare stretchable films has achieved flexible control over chiroptical properties, opening up new opportunities for chiroptical research in solid materials.
Intelligent and controllable circularly polarized absorption and emission switching with high dissymmetric factors have attracted great attention due to the significant potential applications in chiral chemistry, chiral photonics, and electronics. However, the lack of examples to achieve freely switchable and adjustable chiroptical properties within a single material, especially in the deformable solid materials, limits the further continuous progress. Herein, an unprecedented, simple, and scalable way to achieve the above goal is presented. A stretchable spin-coated thin film is fabricated from chiral helical substituted polyacetylene and thermoplastic polyurethane. Macromolecular chains self-organize into hierarchically chiral superstructures under stretching, facilitating the film to absorb/emit circularly polarized light with opposite handedness from the two faces of the film. The dissymmetry intensity can be adjusted flexibly by controlling the elongation and recovery of the film. The nonreciprocity and chirality adjustability behaviors in stretchable solid materials represent a fundamental advancement and provide new opportunities for the design, preparation, and applications of chiroptical materials.
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