The chemical reduction of graphene oxide (GO) typically involves highly toxic reducing agents that are harmful to human health and environment, complicated surface modification is often needed avoid aggregation the reduced GO during process. In this paper, a green facile strategy reported for fabrication soluble GO. proposed method based on exfoliated in tea solution by making use capability aromatic rings polyphenol (TP) contained solution. measurements resultant confirm efficient removal...

We reported a novel method of producing the cross-linked polybutadiene elastomer which could be thermally recycled like plastic materials without sacrifice functional utility. The commercial was first attached with furan via thiol–ene reaction, and network then built Diels–Alder click reaction between bismaleimide groups from polybutadiene. obtained polymer had good solvent resistance ambient temperature to 100 °C. mechanical properties modified tailored by amount ratio bismaleimide....

Pristine carbon nanotubes (CNTs) were activated to exhibit Diels–Alder (DA) reactivity in a polymer matrix, which was modified with monomers containing furan groups. The DA-active matrix transferred into dynamic reversible cross-linked inorganic–organic network via reaction CNTs, where pristine CNTs used as dienophile chemicals and furan-modified SBS acted the macromolecular diene. In this system, mechanical properties well resilience solvent resistance greatly improved even presence of only...

Devising energy-efficient strategies for the depolymerization of plastics and recovery their structural components in high yield purity is key to a circular economy. Here, we report case study which demonstrate that vinylogous urethane (VU) vitrimers synthesized from bis-polyethylene glycol acetoacetates (aPEG) tris(2-aminoethyl)amine can be degraded by water at moderate temperature with almost quantitative (≈98 %) aPEG. The rate controlled temperature, amount water, molecular weight aPEG,...

Abstract Polymers are ideal materials for information printing and storage encryption through multiple channels. In this study, the visible color, fluorescent, stress‐color combined to print information. Stress‐color is achieved using an acid‐tunable dynamic reaction between a β‐diketone amine group via light‐induced transformation of spiropyran (SP), which also directly prints color The fluorescent patterns stable SP released from enaminone structure. By achieving coding, data further...

Gum arabic (GA), a natural polymer, is extensively used in food, drug, confectionery and soft drinks processing. In this paper, we present green facile approach for preparing graphene–Ag nanohybrids assisted by GA. brief, GA functionalized graphene sheets (GA-G) were prepared directly exfoliating graphite flakes gum (GA) aqueous solution with sonication. The yield of exfoliation was systemically studied varying the initial concentration, concentration sonication time. Furthermore, sheets–Ag...

A novel mechanically strong, electrically conductive nanocomposite paper based on reduced graphene oxide nanosheets and aramid nanofibers was prepared by vacuum-assisted filtration followed reduction.

Covalent adaptable networks (CANs) have various potential applications for their dynamic features benefiting from the existence of covalent bonds (DCBs). Here we exploit acetoacetyl chemistry to design CANs in which formed amides (AFAs) act as a type DCBs. We first illuminate that transamidation AFAs is ascribed "proton-switch" mechanism via model study and DFT calculations. When such AFA linkages are incorporated into cross-linked polymer networks, malleability recyclability demonstrated....

Though possessing advantages of durability and exceptional performances profit from cross-linked structure, it is challenging to recycle reuse thermoset polymers. Here, reprocessability in industrially relevant polyurethane polyurea thermosets unveiled. Unlike prior methods, this strategy does not require the complicated design monomer structures suitable for a variety systems. With enaminoneamide structure inserted, PU possesses reprocessing performance without affecting mechanical...

The organic−inorganic nanocomposites involving OPBI (poly[2,2′-(p-oxidiphenylene)-5,5′-bibenzimidazole]) and polyhedral oligomeric silsesquioxane (POSS) were prepared via in situ polymerization of 4,4′-dicarboxydiphenyl ether (DCDPE) 3,3′-diaminobenzidine (DABz) the presence POSS where organic group on cage is phenyl. NMR, XPS, XRD characterization POSS-g-OPBI, purified from POSS-g-OPBI/OPBI hybrid, revealed that chains successfully attached to phenyl through Friedel−Crafts (F−C) reaction....

Abstract A method for the fabrication of a biomimetic Janus composite membrane is reported here. This approach based on with vertical gradient crosslinking degree, which achieved through UV light–induced dimerization anthracene grafted poly(styrene‐ block ‐butadiene‐ ‐styrene) chains in presence carbon nanotubes. light penetration controlled by accretion nanotubes to ultimately tailor heterogeneous degree thickness. kind structure applied here shape actuation. Here, solvent or memory...

Covalent adaptable networks (CANs) are an emerging kind of smart materials in which cross-links reversible upon some stimuli and then provide malleability a stimuli-responsive ability to the materials. There is trend endow CANs with multistimuli-responsive capabilities rapid stress relaxation pursue more advanced applications. To integrate these two features into one material, here, dual-dynamic covalent bonds (imines boronic esters) aniline trimer (ACAT) were incorporated styrene butadiene...

The chemical upcycling of polymers is an emerging strategy to transform post-consumer waste into higher-value chemicals and materials. However, on account the high stability bonds that constitute their main chains, modification many proves be difficult. Here, we report a versatile approach for linear cross-linked polyureas, which are widely used because stability. treatment these or composites with acetylacetone affords di-vinylogous amide-terminated compounds in good yield. These products...

Benzoxazine-functionalized poly(styrene-b-butadiene-b-styrene) (SBS) has been successfully synthesized via the thiol–ene click reaction. Unlike typical method for fabrication of blends SBS and thermosetting resins, benzoxazine could be directly attached on to chains PB domains this triblock copolymer without any prechemical modification incorporation thiol functionalized (PTMP-BZ). AFM characterization shows that both subsequent ring-opening reactions have a profound influence final...

In response to the increasing public awareness of serious dye-contained wastewater contamination, we herein fabricated a novel anthracene-containing hyperbranched poly(ether amine) (hPEA-AN)/carbon nanotube (CNT) ultrathin membrane (UTM), which combined both merits conventional dye adsorption strategy and filtration process, implement efficient selective molecules also separation mixtures by molecular filtration. Taking advantage π–π stacking interactions between anthracene CNT sidewalls...

We report an approach to the fabrication of nanostructured thermoplastic elastomeric composites based on poly(styrene-b-butadiene-b-styrene) (SBS) crosslinked by polyhedral oligomeric silsesquioxane (POSS). The crosslinking reaction took place between thiol functional groups from POSS molecules and double bonds within soft block segment SBS via UV-induced thiol–ene reaction. Unlike typical methods constructing composite systems, triblock copolymer was directly used produce materials with...

This work presents a straightforward strategy to introduce dynamic covalent aminoketoenamide (AKE) onto the backbone of polyurea-based polymers. Bis-vinylogous amides were synthesized from diamines and acetylacetone used as drop-in agents during polymerization compounds featuring amine, hydroxyl, isocyanate reactive groups. chemistry leads AKE-containing poly(urea urethane)s (PUUs) that are thermally healable reprocessable due dissociation AKE at elevated temperatures. The obtained PUUs...

Metal–organic frameworks (MOFs) are promising materials for gas separation membranes. However, the framework flexibility affects their molecular-sieving properties. Herein, we restrict of zeolitic imidazolate framework-7 (ZIF-7) by controlling its phase transition in mixed-matrix membranes (MMMs), relying on so-called "space-confinement effect" a novel thermosetting polymer, poly 2,2′-(p-oxydiphenyl)-5,5′-bibenzimidazole (OPBI) polymer. Compared with pure OPBI membrane, optimized containing...

Understanding the evolution of self-wrinkling is critical to control wrinkles that widely exist in nature and engineering. Using a single-layer film photosensitive anthracene-functionalized poly(styrene-block-butadiene-block-styrene) (SBS-An) as model, we investigated generation self-wrinkles on this film. Upon irradiation with UV light, SBS-An was designed achieve gradient structure controllable elasticity viscoelasticity. The inner stress produced via UV-light-induced cross-linking, which...

Poly(styrene-<italic>block</italic>-butadiene-<italic>block</italic>-styrene) (SBS) is a typical example of thermal plastic elastomers (TPE).