Mesochiral phases from the self-assembly of chiral block copolymers

Abstract

Self-assembly of block copolymers with chiral sense gives mesochiral phases possessing helical sense. With the controlled chirality of the helical cylinder and chiral network, it is appealing to fabricate chiral materials for applications.

Regulating the Helical Chirality of Racemic Polyacetylene by Chiral Polylactide for Realizing Full-Color and White Circularly Polarized Luminescence

“…To the best of our knowledge, even though chirality transfer has been studied in the literature concerning PLA-based copolymers, , directly transferring the chirality of PLA to other macromolecules in solid films through a simple physical blending is rarely reported. Here, to explore the chirality transfer process, we took PLLA as an example and first prepared a two-component PLLA/P1 composite film and pure PLLA film for characterization.…”

“…To the best of our knowledge, even though chirality transfer has been studied in the literature concerning PLA-based copolymers, 4,66 PLLA film for characterization. As shown in Figure S2c, the pure PLLA film shows good transparency and a free-standing property, confirming that PLLA can serve as a film-forming substance.…”

Self-Assembly of Semiflexible-Coil Chiral Block Copolymers under Various Segregation Strengths with Multiple Secondary Interactions

“…Chiral block copolymers (BCPs*) have demonstrated the ability to self-assemble into chiral hierarchical superstructures (mesochiral textures) by interplaying secondary interactions based on the segregation forces and constraints of the chemical linkages within dissimilar blocks. , Charged poly­(isocyanide)-based BCPs* might self-assemble into tertiary helical superstructures with controlled handedness, suggesting the chirality effect on self-assembly. , Polylactide-based BCPs* with simplified secondary interactions provide a represented system to intrinsically examine the chirality effect on BCP self-assembly, giving the formation of mesoscale helices with hexagonally packed lattice, a helical phase (H*), , as further proved by the self-assembly of poly­(cyclohexylglycolide) (PCG)-based BCPs* to generalize the H* formation . The formation of the H* from BCPs* with achiral-rich fractions is attributed to the compositional asymmetry, giving the cylindrical curvature from self-assembly, while the creation of a cholesteric liquid crystalline-like interdomain with helical steric hindrance from the interface and interdomain ( i.e.…”

Chiral transfer‐dictated self‐assembly of chiral block copolymers

“…[86] It was ascribed to that the PLCG/PDCG blocks possessed a bulkier aromatic pendant group than a methyl one in PLLA/PDLA, endowing the PBnMA-b-PLCG/PBnMA-b-PDCG BCPs* with a higher twisting power in the chiral transfer process and a higher thermodynamic stability to the helix* phase. [87] In addition, the replacement of PLLA/PDLA with PLCG/PDCG avoided the crystallization of the chiral block.…”

“…[229] Some of the gyroid, primitive, and diamond networks displayed controllable structural colors, making them great choices to prepare photonic materials. [87,209,[217][218][219] Specifically, the gyroid networks characterized in a homogeneous feature (e.g., uniform nanoporous geometry, high porosity, high-specific surface area value, and structural symmetry). [188,189] Gu et al prepared a chiral beam splitter using photonic chiral networks, which allowed left-handed circularly polarized light to transmit through more, but reflected right-handed circularly polarized light more (Figure 10A).…”