Abstract Stable, tough, and functional adhesion systems are urgently needed for a sustainable society. As resolution, supramolecular scientists have introduced reversible movable crosslinked materials into systems. Reversible crosslinks can repeatedly associate dissociate. Therefore, show self-healing stimuli-responsive properties. Moreover, topological in which the polymer chains penetrate cavities of cyclic molecules. The sliding with deformation enabled achievement showing high toughness...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Extrinsic Cotton Effect of Acridine Orange Bound to Native DNA and Helical Poly-α,L-glutamic Acid1K. Yamaoka R. A. ResnikCite this: J. Phys. Chem. 1966, 70, 12, 4051–4066Publication Date (Print):December 1, 1966Publication History Published online1 May 2002Published inissue 1 December 1966https://pubs.acs.org/doi/10.1021/j100884a048https://doi.org/10.1021/j100884a048research-articleACS PublicationsRequest reuse permissionsArticle...

Both strong and easily dismantlable adhesive systems are required to realize a sustainable society by recovering reusing substrates. Introducing topological cross-links with cyclodextrins (CDs) into adhesives can improve their strength. In this study, we prepared movable cross-linked poly(ethyl acrylate) (PEA-TAcγCD) polymerizable CDs acid-degradable bonds (TAcγCDAAmMe) for both adhesion. The O-amidomethyl bond, which links CD functional group, be degraded mixing Brønsted acid. By combining...

Acrylic adhesive sheets have been used for many applications, from popular seal materials to high-end electrical devices. One of the basic and critical design features adhesives is effective covalent cross-linking superior properties. On other hand, prevents reuse or recycling adhesive. This makes insoluble poorly workable. For development sustainable adhesives, we investigated based on acrylic elastomers with "Movable Cross-links" (M-PEA-CD (0.5)) copolymerized 0.5 mol % cyclodextrin...

Abstract Light‐driven actuators are widely used for smart devices such as soft robots. One of the main challenges is achieving rapid responsiveness, in addition to ensuring favorable mechanical properties. Herein, we focused on photoresponsive polyurethane (CD‐Azo‐PU) based controlling crystallization hard segments (PU) by complexation between azobenzene (Azo) and cyclodextrins (CDs). CD‐Azo‐PU incorporated chain a 1:2 inclusion complex Azo γCD movable crosslink point. Upon ultraviolet light...

Abstract A two‐term Drude equation was proposed to he substituted for the Moffitt‐Yang as an empirical expression in order analyze and regenerate observed optical rotatory dispersion (ORD) curves of synthetic polypeptides proteins. convenient graphical method introduced evaluate four parameters involved present expression. The demonstrated detail with ORD curve sodium poly‐α, L ‐glutamate (NaPLG) at pH 4.35. number poly‐γ‐benzyl‐ (PBLG) both helix random‐coil were analyzed. For all examined,...

Organic-inorganic materials have been widely utilized in various fields as multifunctional materials. Poly(dimethyl siloxane) (PDMS), a typical inorganic polymer, has industrially appealing functions, such transparency, biocompatibility, and gas permeability; however, it poor mechanical properties. We incorporated organic-inorganic hybrid elastomers (PDMS-γCD-AAl⊃P(EA-HEMA) (x)) with movable crosslinks, we hydrogen bonds reversible crosslinks. The organic polymer poly ethyl...

To achieve a carbon circulation society, petroleum-derived resources must be replaced with cellulose and other bioderived resources. Although serving as filler enhances the mechanical properties of polymeric materials upon mixing, it remains challenge to increase contents fillers while maintaining enhanced properties. Regarding properties, polymer composites containing can usually improved by adding small percentage fillers. Unfortunately, mixing large amounts creates brittle composites....

A strong, tough, and stable adhesion system used in various environments must be developed. long-lasting should effectively perform the following five aspects: strength, toughness, energy dissipation property, self-restoration creep resistance property. However, these properties are difficult to balance using conventional adhesives. Here, a new topological single-movable cross-network (SC) materials [SC(DMAAm) Adh] was designed. 3-(Trimethoxysilyl) propyl acrylate as anchor,

To reveal the synergic effects of movable and reversible cross-links, we fabricated cross-linked hydrogels with hydrophobic acetylated cyclodextrins (CDs). The obtained showed high toughness based on broad range relaxation times achieved by mobility cross-links interaction. resulted from lack hydrogen bonds between triacetylated γCD (TAcγCD) units main chains. High also occurred because TAcγCD were not hydrated. localization hydration forms domains distribution units. disperse stress upon...

Acridine and triphenylmethane dyes are known to display therapeutic interference in combination, but the basis for this interaction is not understood. When added DNA, representatives of each group dyes, which alone optically inactive, displayed strong signals as monitored by optical rotatory dispersion. However, when trypaflavin crystal violet were both polymer, only signal due bound was observed. This competition polymer explored on one hand alterations concentrations structures other use...

自己修復は,外的な損傷を自発的または刺激に応答して,構造および物性を回復する機能である。我々は超分子化学に基づく2種類のネットワーク構造を高分子材料に導入することで,自己修復性を付与することに成功した。可逆性架橋は,くり返し結合・解離が可能なホスト-ゲスト包接錯体で架橋を形成する。材料は切断面で再接着して,元の力学特性を取り戻す自己修復性を示した。可動性架橋は,環状分子の空孔に高分子鎖が貫通したトポロジカル架橋である。変形に伴って架橋点がスライド運動することで,強靭かつ高い物性回復性を示した。 これらの超分子ネットワーク構造は,高分子材料に強靭性・自己修復性を付与し,材料の長寿命化および再利用を可能にすることで,石油由来の高分子材料の使用量削減につながり,資源循環型社会を実現させる。

Thermo-responsive polymers are applied as surface modifications for the temperature switching of hydrophilic and hydrophobic properties through adsorption grafting on solid substrates. The current understanding influence polymer chains bound to transition behavior thermo-responsive is rather restricted. In this study, we aim elucidate effect at interface sol-gel aqueous methylcellulose (MC) solutions by employing a quartz crystal microbalance (QCM) evaluate shear modulus near interface. When...

Due to its biodegradation ability, poly(ε-caprolactone) (PCL) is a suitable alternative for packaging materials; however, can also lead instability in usage. Cyclic polyphenylene sulfide (7U) has been shown form rotaxane structures with PCL by simple blending generate the π-π stacking effect and movable cross-link. A 2-fold increase toughness no decrease Young's modulus PCL-based polyurethane 7U are observed. The mainly exist amorphous regions have impact on crystallinity of PCL. Under...

Organic–inorganic composite elastomers with reversible cross-links formed by β-cyclodextrin and adamantane (Ad) were prepared. Excess Ad units improve the mixability of polydimethylsiloxane poly(ethyl acrylate) to increase healing ratio.

It is important to understand the interfacial structure and physical properties of a polymer material improve its function. In this study, we used quartz crystal microbalance (QCM) neutron reflectivity (NR) measurements evaluate viscoelasticity an aqueous methylcellulose solution near gold interface. The apparent shear modulus, which was calculated from complex frequency, assess gelation behavior. modulus determined via QCM suggested high-frequency rheological that reflected relaxation...

The physical gelation of an aqueous methylcellulose (MC) solution in response to temperature change was evaluated using a quartz crystal microbalance (QCM), which is extremely sensitive mass balance that measures changes per unit area from nanogram microgram level. Then, the potential use QCM for interfacial selective viscoelasticity measurements investigated. viscosity accompanying were observed as resonance frequency shifts. determined dependence shifts showed good agreement with...