Self-healing of covalently cross-linked polymers under an ambient visible light in the bulk state, air, at room temperature using radical exchange thiuram disulfide units is reported. The successful attachment surfaces cut pieces proceeded conditions exposure to from a commercial tabletop lamp, as confirmed by bending and tensile tests. Detailed facts importance specialist readers are published ”Supporting Information”. Such documents peer-reviewed, but not copy-edited or typeset. They made...

Well-healed: Polymers cross-linked with trithiocarbonate (TTC) units were prepared by a RAFT polymerization. The repeatable self-healing systems or macroscopic fusions accomplished UV irradiation of the polymer in solution and bulk state. fusion completely separated parts was successful (see pictures, BA=n-butyl acrylate).

Linked: Polymers cross-linked with diarylbibenzofuranone units have been prepared by polyaddition. The exchange of bonds the gels and their macroscopic self-healing were accomplished under air at room temperature in dark. fusion completely separated parts was successful (see picture). Detailed facts importance to specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted authors. Please note:...

Gut geheilt: Mit Trithiocarbonat(TTC)-Einheiten vernetzte Polymere wurden durch RAFT-Polymerisation hergestellt. Die selbstheilenden Systeme oder makroskopischen Zusammenschlüsse entstanden bei UV-Bestrahlung des vernetzten Polymers in Lösung und im Festkörper. Es gelang sogar der Zusammenschluss vollständig getrennter Teile (siehe Bilder, BA=n-Butylacrylat).

Dynamic covalent polymers incorporating thermally reversible alkoxyamine units in the main chain were synthesized, and their thermal structural reorganization behavior was systematically investigated. The model reaction using derivatives clearly revealed that exchange between occurred upon heating over 60 °C, degree of strongly depended on temperature, time, concentration. Polycondensation from alkoxyamine-based diol adipoyl chloride at room temperature successfully afforded corresponding...

Mit Diarylbibenzofuranon-Einheiten quervernetzte Polymere wurden durch Polyaddition synthetisiert. Der Bindungsaustausch der Gele und ihre makroskopische Selbstheilung an Luft bei Raumtemperatur im Dunkeln erreicht. Die Verbindung komplett getrennter Teile war erfolgreich (siehe Bild).

Changes in the structure of networks chemical gels cross-linked by covalent bonds have been investigated using reshuffling (i.e., degenerative exchange) reactions bonds. These can be applied to form functional materials including self-healing polymers, plasticity and shape-memory polymers. Herein, network structures were changed through radical trithiocarbonate (TTC) units, swelling degrees or sizes controlled solvent quality. The prepared RAFT copolymerizations butyl acrylate a TTC...

Posttranslational modifications (PTMs) of histones play an important role in the complex regulatory mechanisms governing gene transcription, and their dysregulation can cause diseases such as cancer. The lack methods for site-selectively modifying native chromatin, however, limits our understanding functional roles a specific histone PTM, not single mark, but intertwined PTM network. Here, we report synthetic catalyst DMAP-SH (DSH), which activates chemically stable thioesters (including...

Poly(n-butyl acrylate) networks were prepared by conducting click chemistry between dialkyne alkoxyamines and azide functionalized star-like oligomers synthesized ATRP. The dissociation of under UV irradiation was exploited to cleave the junctions network precursors. efficiency cleavage, generating dangling nitroxides increased mobility poly(n-butyl segments, examined ESR monitoring. progressively reformed after via recombination radical species. These reactions resulted in self-healing...

Programmed thermodynamic formation of star-like nanogels from designed diblock copolymers with thermally exchangeable dynamic covalent bonds in their side chains and structure analysis the were performed. Linear that consist poly(methyl methacrylate) block random copolymer methyl methacrylate (MMA) methacrylic esters alkoxyamine moiety prepared by atom transfer radical polymerization (ATRP). By heating anisole, a cross-linking reaction occurred as result crossover moieties to afford...

Covalently networked polymer gels were developed with two notable functionalities: de-cross-linking by dynamic covalent exchange based on a radical crossover reaction and insertion of monomer into the cross-linkers. The network synthesized free-radical copolymerization styrene bifunctional an alkoxyamine linker that has capabilities to other derivatives in process polymerize controlled manner. Three types polymers different cross-linking densities obtained changing ratio styrene. was carried...

The formation of symmetrical and asymmetrical (miktoarm) star-like nanogels by the cross-linking reaction complementarily reactive diblock copolymers via a radical crossover alkoxyamine units was successfully accomplished. Four types with connected at different positions chemical compositions were prepared random copolymerization methyl methacrylate methacrylic esters from poly(methyl methacrylate) or polystyrene prepolymers using atom transfer polymerization method. Star-like formed dynamic...

Surface modification using hydrophilic polymer coatings is a sustainable approach for preventing membrane clogging due to foulant adhesion water treatment membranes and reducing membrane-replacement frequency. Typically, both molecular descriptors time-domain nuclear magnetic resonance (TD-NMR) data, which reveal physicochemical properties polymer-chain dynamics, respectively, are required predict the understand mechanisms of coatings. However, studies on selection essential components from...

Effective designs of biodegradable polymers are highly desirable for achieving a sustainable society by decreasing environmental burden and replacing petroleum-based resources with biomass. Low-field NMR is one the candidate techniques because it provides information on higher-order structure dynamics quickly conveniently. Although machine learning approaches such as Bayesian optimization (BO) convolutional neural networks (CNNs) significant, there have been almost no reports effective...

Reversible cross-linking of alkoxyamine-containing hydrophilic dynamic covalent polymers in aqueous media has been accomplished. Water-soluble with alkoxyamine units the side chains were synthesized by radical copolymerization 2-(dimethylamino)ethyl methacrylate and methacrylic esters units, subsequent protonation dimethylaminoethyl groups hydrochloric acid. By heating water at 100 °C a closed system, hydrogels formed exchange reactions. Because reactions are tolerant water, chain caused...

Changes in the microphase-separated structure of poly(styrene-b-ethylene-co-butylene-b-styrene) (SEBS) triblock copolymer (13 wt % polystyrene (PS) block) were investigated during mechanical deformation. In situ synchrotron radiation small-angle X-ray scattering (SAXS)/wide-angle (WAXS) measurements successfully performed for SEBS under equi-biaxial deformation as well uniaxial SAXS/WAXS revealed changes (1) shape spherical PS domains, (2) spacing domains packed body-centered cubic initial...

The formation of star-like nanogels with different arm lengths via a radical crossover reaction alkoxyamine units in diblock copolymers and direct observation the by scanning force microscopy were successfully accomplished.

Reactive poly(methacrylate)-based polymer brushes with radically exchangeable alkoxyamine units in the side chains were prepared on flat silicon substrates and their reactivity surface properties investigated. The reactive by surface-initiated atom transfer radical polymerization (ATRP) graft density of was estimated to be approximately 0.36 per nm2. Radical crossover reactions among at ends fluorinated carried out produce low free energies. Angular-dependent X-ray photoelectron spectroscopy...

Rubber elastic theory describes the relationship between microscopic chain structure and macroscopic mechanical properties of soft network polymers, such as elastomers gels. When deformation exceeds a certain threshold, formation extended chains induces hardening failure materials, which has been tackled by experiments involving measurement techniques mechanochemistry. However, concerns connectivity behavior hardly described. Herein, we demonstrate quantification based on complex science to...

ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSolvent-Controlled Formation of Star-like Nanogels via Dynamic Covalent Exchange PSt-b-PMMA Diblock Copolymers with Alkoxyamine Units in the Side ChainYoshifumi Amamoto†, Moriya Kikuchi‡, Hideyuki Otsuka*†‡, and Atsushi Takahara*†‡View Author Information† Graduate School Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan‡ Institute for Materials Chemistry Japan*Corresponding authors. E-mail: [email protected] (H.O.),...

Mesh-size control of network structures chemical gels, i.e. mesh expansion by insertion styrene derivatives and shrinking divinylbenzene in the was carried out. Chemical gels with alkoxyamine at their cross-linking points were synthesized radical copolymerization methyl methacrylate divinyl monomer units. The monomers inserted heating each separately, size evaluated small-angle X-ray scattering (SAXS) measurements. Since a living polymerization procedure adopted for reactions, sizes...