A novel pH sensitive shape-memory polymer (SMP) is prepared by cross-linking the β-cyclodextrin modified alginate (β-CD-Alg) and diethylenetriamine (DETA-Alg): The reversible β-CD-DETA inclusion complexes serve as a phase, cross-linked chains fixing phase. It shown that this material can be processed into temporary shape we needs at 11.5 recover to its initial 7. recovery ratio fixity were 95.7 ± 0.9% 94.8 1.1%, respectively. Furthermore, showed good degradability biocompatibility. Because...

The first direct asymmetric vinylogous Mannich (AVM) reaction of α,α-dicyanoolefins and N-Boc aldimines was described promoted by a simple chiral bifunctional thiourea-tertairy amine organocatalyst. highly efficient (S/C up to 1000) regio-, stereoselective (generally >99% de, 96 >99.5% ee) at room temperature for broad array substrates. Enantiomerically pure δ-amino acid could be smoothly prepared from the adduct.

Healable, electrically conductive materials are highly desirable and valuable for the development of various modern electronics. But preparation a material combining good mechanical elasticity, functional properties, intrinsic self-healing ability remains great challenge. Here, we design composites by connecting polymer network single-walled carbon nanotubes (SWCNTs) through host-guest interactions. The resulting show bulk electrical conductivity, proximity sensitivity, humidity sensitivity...

Light-, pH- and thermal-responsive hydrogels were prepared by introducing dansyl-aggregations azo-cyclodextrin inclusion complexes as switches. The resulting material showed dual shape memory behavior in response to light, pH or temperature, respectively, exhibits the triple-shape effect light sequentially.

Shape memory polymers (SMPs), with the capability to change from one or more temporary shapes predetermined in response an external stimulus, have attracted much interest both academia and industries. When introducing supramolecular interactions that been featured as dynamic reversible into design of novel SMPs, intriguing unique functionalities engendered thereby broaden potential applications SMPs new territories. In this review, we summarize recent progress made based on interactions,...

A kind of metal-organic framework made from γ-cyclodextrin (γ-CD) and potassium ions were explored as excellent formaldehyde (HCHO) absorbents. The adsorption capacity speed γ-CD-MOF-K are both about 9 times higher than those activated carbon, which attributed to the porous structure synergistic effect hydrogen bonding host-guest interactions.

A dual redox and biorelevant triggered supramolecular system is developed through noncovalent inclusion interactions between the ferrocene (Fc) modified on camptothecin (CPT) β-cyclodextrin (β-CD) at end of methoxy polyethylene glycol (mPEG). With these two segments, a stable structure, i.e., mPEG-β-CD/Fc-CPT, can be formed, then self-assembled into micellar structures in water. Interestingly, micelles showed uniform sphere high constant drug loading content, hyper-fast redox-responsive...

The adsorption of CO2 by conventional liquid alkanolamine adsorbents does not meet the requirements for green-friendly development in industrial applications. In this work, we constructed NH2-β-CD-MOF first time through amino-functionalization lowest-priced, readily available, and biocompatible β-CD. Subsequently, samples were characterized single-crystal X-ray diffraction, powder scanning electron microscopy, differential calorimetry, thermogravimetric analysis, elemental N2...

Inspired by animal muscles, we developed a kind of tough elastomers combining high strength and stretchability with autonomous self-healing capability. A key structural feature is the construction double network (DN) connected hydrogen bond host-guest interactions. The first classic elastomer polyacrylate matrix cross-linked strong bonding. second formed through interactions between polycyclodextrin adamantane (Ad) groups on side chain. Supramolecular two networks make them miscible...

The bifunctional thiourea–tertiary amine derivatives of simple chiral diamines serve as highly enantioselective catalysts for the Michael addition α-substituted cyanoacetates to vinyl sulfones, giving an efficient protocol construction all-carbon substituted quaternary stereocentre.

The asymmetric Michael-type Friedel–Crafts reaction of naphthols and nitroolefins promoted by bifunctional thiourea–tertiary amine organocatalysts (up to 95% ee) was investigated; on simply extending the time further cascade reactions could occur generate enantiopure dimeric tricyclic 1,2-dihydronaphtho[2,1-b]furanyl-2-hydroxylamine derivatives.

This paper studies a kind of biocompatible hydrogel composed alginate-g-β-cyclodextrin (Alg-β-CD) and ferrocene-terminated pluronic F127 (F127-Fc), which showed gel–sol phase transformations in response to temperature, oxidizing agents, glucose because the reversible association–dissociation Fc-β-CD inclusions micelles.

Nowadays, the practical applications of metal–organic framework (MOF)-based fluorescence detectors are severely hindered because complex synthesis process linkers or heavy metal contamination. The development a simple, inexpensive, and environmentally friendly sensing system remains huge challenge. In this study, we designed synthesized TPE@γ-CD-MOF-K using facile in situ encapsulation method. unique pore structure γ-CD-MOF allowed it to effectively include TPE explosives as guests...

The research of hydrogels has been increasingly focused on designing an effective energy dissipation structure in recent years. Here, we report a kind novel supramolecular cross-linker, which was formed by self-assembling amphiphilic block copolymers with guest groups at the end and vinyl-functionalized cyclodextrin (CD) through host–guest interaction. These cross-linkers could dissipate effectively since they combined multiple sacrificial mechanisms across multiscales physical interactions....

An ideal electromagnetic interference (EMI) shielding material possessing lightweight, high EMI efficiency (EMI SE > 60 dB), low reflectivity (R < 0.5 or SER 3 and excellent stretchability (strain >200%) with a stable is remarkably desirable but challenging to design for avoiding pollution caused by the rapid development of electronic devices. Here, an elastomeric foam (SDEP/LM) slidable double-network structure covered thin layer liquid metal developed, achieving porosity 67% density 1.1 ±...

The chemoselective ring opening of N-tosyl aziridines with aldehydes catalyzed by an N-heterocyclic carbene was investigated under aerobic conditions. Unexpected carboxylates 1,2-amino alcohols from the corresponding aldehydes, rather than acyl anion ring-opened β-amino ketones, were exclusively obtained. A plausible mechanism for this unprecedented carbene-mediated reaction also proposed.

Abstract A novel redox‐induced shape‐memory polymer (SMP) is prepared by crosslinking β‐cyclodextrin modified chitosan (β‐CD‐CS) and ferrocene branched ethylene imine (Fc‐PEI). The resulting β‐CD‐CS/Fc‐PEI contains two crosslinks: reversible redox‐sensitive β‐CD‐Fc inclusion complexes serving as phases, covalent crosslinks fixing phases. It shown that this material can be processed into temporary shapes needed in the reduced state recovers its initial shape after oxidation. recovery ratio...

A multistimuli sensitive shape memory hydrogel with dual and triple properties was prepared by grafting dansyl groups into the network of polyacrylamide (PAAM). The hydrophobic aggregation acted as molecular switches, which showed reversible aggregation-disaggregation transition in aqueous solution response to pH or temperature change.

Two end-decorated homopolymers, methoxy polyethylene glycol-ferrocene (mPEG-Fc) and poly(N-isopropylacrylamide)-β-cyclodextrin (PNIPAM-β-CD), were further orthogonally self-assembled into stable micelles in aqueous solution by controlling the temperature of via terminal host–guest interactions. Because H2O2 cleavable CD/Fc connection thermoresponsive PNIPAM, an thermo dual-controlled drug release based on this system was also achieved. Interestingly, cytotoxicity evaluation...