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.

Chiral fibers exist widely in nature; however, only limited success has been achieved in imitating them for preparing artificial continuous chiral fibers. This results in a big scientific challenge to deeply investigate chiral materials from viewpoints of macroscopic chirality and practical uses. The present paper reports the first protocol for preparing optically active nanofibers derived from chiral helical polymers via the electrospinning process, using a helical substituted polyacetylene as a model. Scanning electron microscopy (SEM) images demonstrate the electrospun nanofibers possessing regular morphology, uniform dimension, and the desired continuity. Circular dichroism (CD) spectra show that the nanofibers have remarkable optical activity, which has originated in the predominantly one-handed helical polymer chains. To further improve the properties of the nanofibers, substrates were used for preparing composite nanofibers, which also show the anticipated optical activity. The present work opens up an unprecedented, versatile, and powerful platform for preparing chiral polymer nanofibers with potential chiral applications as chiral sensors and membranes, among others.

We anticipate that nonspherical chiral particles may open up a new research field as advanced functional micro- and nanomaterials.

Synthetic chiral helical polymers have achieved impressive progress in past few decades. Unfortunately, how to construct chiral helical polymer‐derived functional materials still remains highly challenging. The present contribution reports an unprecedented, one‐step strategy for judiciously combining chiral helical polymer with graphene to construct chiral hybrid foams. Graphene oxide (GO), ascorbic acid (L‐AA), Rh catalyst, and an achiral acetylenic monomer bearing phenylboronic acid group are mixed in an aqueous dispersion. Under mild conditions, the monomer underwent polymerization; meanwhile GO transforms into reduced graphene oxide (RGO) which in situ self‐assembles to construct a 3D porous structure. Herein, L‐AA simultaneously plays double roles: 1) working as a chiral source for the monomer to undergo helix‐sense‐selective polymerization or transferring its chirality to the polymer chains via forming borate structure; and 2) working as a reducing agent for reducing GO. The preparation strategy combines four processes into one single step: monomer polymerization, chirality transfer, reduction of GO, and RGO's self‐assembly. The eventually obtained chiral hybrid foams demonstrate advantages of porous structure, chirality, and reversible borate functional groups. The established preparation strategy promises a potent platform for conveniently constructing advanced chiral polymeric materials and even chiral hybrids starting from achiral monomers.