Wavy supramolecular polymers formed by hydrogen-bonded rosettes

Abstract

A novel barbiturate-functionalized supramolecular monomer provides unprecedented wavy supramolecular polymers with periodic inversion of curvature domains via the formation of hydrogen-bonded rosettes.

Gel scaffolds and emerging applications in biomedicine

“…4d). 21,22 The photoresponse hydrogel (PR-gel) (10) was obtained by integrating 4arm-PEG and azobenzene into cellulose nano-brils (CNFs). It has been proved to possess good mechanical strength, structural stability, and reversible recoverability.…”

“…9b). 33 Fluorescent glycolipids (21) were obtained from the direct condensation of vinyl esters with functionalized sugar alcohol using Novozyme 435, an immobilized lipase B from Candida antarctica. They were found to self-assemble into the gel in vegetable oils and highly hydrophobic solvents.…”

Non‐uniform Photoinduced Unfolding of Supramolecular Polymers Leading to Topological Block Nanofibers

“…[9] It is worthy to note that the unfolding of SP fold of 2 does not necessarily occur from termini as unfolded domains could be observed between the helically folded domains.W epostulated that unfolding could occur also from defected sites, [16] which in our SPs correspond to locally misfolded domains. [17] Prolonged UV-light irradiation of the topological block SP solution at 323 Kfor 60 min afforded fully unfolded SP unfo as confirmed by dynamic light scattering (DLS), in situ small angle X-ray scattering (SAXS) and AFM (Figures 3c,d, S11). DLS measurements before and after the extended UV-light irradiation revealed that the polydispersity index (PDI) of SPs became larger from 0.284 to 0.373 (Figure S11), suggesting that the transformation from compact to dispersed structures.I nt he SAXS measurements,t he nonperiodic oscillatory features of SP fold that is ac haracteristic of the static intrinsic curvature became unobservable after the UVlight irradiation (Figure 3d).…”

Harmonizing Topological Features of Self-Assembled Fibers by Rosette-Mediated Random Supramolecular Copolymerization and Self-Sorting of Monomers by Photo-Cross-Linking

“…Indeed, AFM observation of the SP linear irradiated for 1.5 min with UV light displayed similar SP fibers, but many torn parts were observed (Figure B). The observation implied that the formation of oligo-diacetylenes disrupted the stacking between rosettes, generating many internal defects in SP linear and rendering them physically fragile to adsorption on the HOPG substrate. , Prolonged UV irradiation (6–25 min) gradually produced yellow precipitates that did not dissolve even upon heating the suspension to 90 °C (Figure S6), suggesting further progress of photoreaction to produce oligo-diacetylenes ( 2 photo ) n . Hereafter, SP linear including ( 2 photo ) n is denoted as SP linear ⊃ ( 2 photo ) n .…”