13 results about "Rotaxane" patented technology

This application relates to the field of polymer materials technology, providing a PET elastomer, composite material, dynamic covalent network polymer, and its preparation method and application. The elastomer is prepared by in-situ self-assembly of crown ether-primary amide dual-functionalized PET through melt blending. Its molecular network integrates a quasi-rotaxane supramolecular crosslinking network. This structure is formed by the host-guest interaction between the crown ether and the primary amide, and can act as a sliding crosslinking point to dissipate energy through the sliding of cyclic components. This application employs a two-step end-capping-in-situ self-assembly process to overcome the technical obstacles of low PET chain-end activity and poor compatibility between polyrotaxane and PET, achieving molecular-level dispersion of quasi-rotaxane in the PET matrix. This fully utilizes the molecular pulley effect to achieve breakthrough toughening of the elastomer. Simultaneously, it combines rigid nanofillers modified with aminosilane coupling agents to form a soft-hard synergistic network, enabling the PET composite material to maintain high toughness while simultaneously improving strength, modulus, and thermal properties.

The invention relates to a thermally activated delayed fluorescence rotaxane polymer as well as a preparation method and application thereof, and belongs to the technical field of organic photoelectric materials. According to the invention, alkyl chain fluorene is packaged in the vertical direction of difluorobenzophenone to form TADF macrocyclic molecules, and then bisphenol A and octanedioyl chloride are used for polymerization in a macrocyclic cavity. Due to the unique controllable motion property and mechanical interlocking structure of rotaxane, polyrotaxane has different mechanical, electronic and optical properties compared with a conventional polymer, so that the polyrotaxane is endowed with unique application, such as elastic tensile property, self-repairing property and the like. More importantly, due to the fact that the non-conductive pu material penetrates through a cavity of a large ring, when the material is applied to a device, a large number of rotaxane polymers are stacked, conductive benzene rings make contact with one another, the conductivity is not affected any more, and due to the fact that the pu material penetrates through the cavity, the insulativity of the pu material does not become the difficult problem that the electroluminescence efficiency of the device is affected any more any more.

To provide a polymer containing [c2]daisy-chain rotaxane with superior compression resistance, a compound therefor where a novel cyclic molecule has been fused with an axial molecule, and [c2]daisy-chain rotaxane.SOLUTION: By utilizing a thiol-ene reaction between [c2]daisy-chain rotaxane containing a compound where a cyclic molecule with a double bond introduced at the end of an axial molecule has been fused with the axial molecule, and a crosslinker containing a thiol group at the end, a polymer containing the [c2]daisy-chain rotaxane is synthesized, thereby forming a gel-like solid of a network polymer with compression resistance.SELECTED DRAWING: Figure 2

The invention discloses an epoxy resin adhesive as well as a preparation method and application thereof, and relates to the technical field of adhesives, the epoxy resin adhesive comprises the following components: epoxy resin, a modified flexibilizer, a curing agent, a filler and a coloring agent; wherein the modified toughening agent is prepared by the following steps: dissolving PEG in deionized water, and adding alpha-CD for reaction; then adding DIBM for reaction, precipitating, washing and drying to obtain an intermediate product; the intermediate product, bio-based polyester polyol and IPDI are subjected to a polymerization reaction, a modified toughening agent with a rotaxane structure and disulfide bonds is obtained, when the modified toughening agent is impacted by external force, an alpha-CD ring can slide along PEG, a pulley effect is generated, local stress is dispersed to a larger range, and the toughness of the adhesive is greatly improved; the rotaxane structure and the epoxy matrix are connected without chemical bonds, and the integrity of a cross-linked network is not damaged by the sliding motion of the rotaxane structure, so that the glass-transition temperature is not reduced while the toughening is realized.

The invention relates to the technical field of supramolecular chemistry and high polymer materials, in particular to a method for preparing polyrotaxane based on cyclodextrin accurate rotaxane and oxidative glutathione cross-linking end capping and polyrotaxane. The method comprises the following steps: a) dissolving cyclodextrin and polyethylene glycol diacrylate in an alkaline aqueous solution or water, and carrying out self-assembly inclusion to form pseudorotaxane; and b) under an alkaline condition, adding oxidized glutathione into the quasi rotaxane solution, and carrying out Michael addition cross-linking reaction to realize end capping, thereby obtaining the polyrotaxane. According to the preparation method, the GSSG is adopted as the difunctional crosslinking end-capping reagent for the first time, the difunctional characteristic of the GSSG is utilized, the GSSG serves as the difunctional crosslinking end-capping reagent and reacts with multiple acrylate groups at the tail ends of the pseudorotaxane at the same time, a three-dimensional crosslinking network is formed, and the prepared polyrotaxane has excellent mechanical properties and unique dynamic slip ring characteristics, and can be applied to the field of chemical engineering. And the method has stimuli responsiveness to a reducing environment.

This invention discloses a method for preparing and applying a β-cyclodextrin-based supramolecular polyurethane protective coating. The method comprises the following steps: dissolving triacetyl-β-cyclodextrin and polycaprolactone diol in a solvent, heating and reacting, followed by precipitation, filtration, and washing in deionized water to obtain β-cyclodextrin-polycaprolactone diol with a rotaxane structure; mixing β-cyclodextrin-polycaprolactone diol and isophorone diisocyanate solvent to obtain a prepolymer; adding a fluorinated chain extender, 2-hydroxyethyl disulfide, and 1,4-butanediol to the prepolymer to obtain a supramolecular polyurethane emulsion, which is then coated onto a substrate surface and cured to obtain the protective coating. The coating of this invention maintains surface stability in complex and humid environments, ensures long-term integrity of the coating material through self-healing, and rapidly captures small molecules such as odors and toxic volatile organic compounds (VOCs).

This invention belongs to the interdisciplinary field of polymer materials and supramolecular chemistry, specifically relating to a polyurethane slip-ring crosslinked network elastic material with a slip-ring effect. The invention uses a macrocyclic molecule with oxetane-functionalized side groups as the cyclic component of a rotaxane. Through host-guest inclusion interactions, it forms a rotaxane polymer with the linear backbone, followed by a ring-opening crosslinking reaction of the oxetane groups, constructing an interpenetrating network structure that combines a three-dimensional covalent network with a supramolecular slip-ring effect. Under mechanical stimulation, this material dissipates energy through the relative slippage of the ring molecules along the backbone, exhibiting high resilience and wide-temperature-range stability. It can be applied in fields such as flexible electronics, wearable devices, and high-performance damping materials.

This invention discloses a polycarboxylate superplasticizer with dynamic self-regulating ability and its preparation method. The specific method includes: (1) preparing carboxyl-substituted crown ethers, ester-substituted crown ethers, and polyether-substituted crown ethers through substitution reactions. (2) preparing a rotaxane backbone through polymerization reactions. (3) assembling the backbone and substituted crown ethers into a rotaxane structure in solution and completing the end-capping using end-capping groups. The superplasticizer prepared by this invention has a rotaxane structure, which can effectively reduce chain coiling and folding, resulting in high water reduction rate, good dispersion and dispersion retention performance; it also has anti-cracking and shrinkage reduction effects; the carboxyl groups in the superplasticizer molecule and the ether chain structure on the side chain have dynamic adjustment capabilities, and by reducing intercalation reactions, it has excellent anti-mud effects in gelation systems. The product preparation process is mild, non-toxic, and pollution-free, and can be stored stably for a long time.

The invention discloses a mechanically interlocked polyrotaxane conductive hydrogel and a preparation method and application thereof, and the hydrogel is prepared by taking quasi rotaxane formed by self-assembling a water-soluble allyl functionalized naphthalene tube and polyethylene glycol diacrylate as a dynamic crosslinking unit and performing one-step photopolymerization on the dynamic crosslinking unit and an ethylene monomer. The hydrogel has ultrahigh stretchability (fracture strain gt, 2450%), skin-like low modulus (about 8.5 kPa), excellent fatigue resistance, high ionic conductivity (7.46 mS / cm) and strong interface adhesion. The invention further discloses application of the hydrogel in preparation of high-performance flexible strain sensors and biological electrodes. In a biological electrode, stable conformal contact with the skin can be formed, high-fidelity and motion artifact-resistant electrocardio and electromyographic signal acquisition is realized, and the signal-to-noise ratio is still kept above 34 dB under dynamic motion. The preparation process is simple, the biocompatibility is good, and the application prospect in the fields of wearable medical monitoring and human-computer interaction is wide.

The invention relates to a preparation method of a high-stretchability organosilicon supramolecular elastomer, which comprises the following steps of: forming a pseudorotaxane structure by aldehyde group modified crown ether and secondary ammonium salt through subject-guest interaction, and introducing the pseudorotaxane structure into a polydimethylsiloxane prepolymer to obtain the high-stretchability organosilicon supramolecular elastomer. The invention provides the crown ether supramolecular polymer network which is excellent in performance, easy to synthesize and mild in synthesis condition, and the host-guest interaction of crown ether and secondary ammonium salt enables the supramolecular polymer network to have good dynamic property. And when being used as a toughening agent to be added into the organic silicon elastomer, the organic silicon elastomer has better mechanical property and energy dissipation, and the maximum elongation and ductility of the organic silicon elastomer are greatly enhanced under the condition that the mechanical strength is not sacrificed.

This invention discloses a method for preparing chiral columnar[5]arene-based rotaxanes with high diastereomeric ratios. The diastereomeric rotaxanes are prepared by a simple one-step end-capping reaction using a decamethoxy columnar[5]arene as the ring, a series of alkyl diamines with different carbon chain lengths (n=6, 8, 10) as the axis, and chiral naphthalene isocyanate as the end-capping agent. Subsequently, high diastereomeric rotaxanes are successfully prepared by a cyclic crystallization resolution method in an alcohol solvent. d.r. Chiral columns [5] for aromatic rotaxanes. Circular dichroism characterization showed that the chiral signals of the six groups of rotaxanes obtained by resolution were mirror-symmetric at 307 nm. High performance liquid chromatography (HPLC) confirmed that the chiral signals of the twelve rotaxane products were... d.r. The values ​​are all higher than 99.5:0.5. The cyclic crystallization strategy adopted in this invention has low energy consumption and is simple to operate, requiring no complex equipment or harsh reaction conditions. This novel crystallization resolution method effectively solves the key problem of scalability in the preparation of chiral rotaxanes, and provides a practical example that combines scalability and high efficiency for the subsequent development of macrocyclic chiral rotaxanes.

To provide a new rotaxane-type photosensitizer exhibiting high light stability and enabling coexistence of suitable water solubility and cell membrane permeability.SOLUTION: A photosensitizer for photodynamic therapy containing a rotaxane-type reactive oxygen species generator, wherein the rotaxane-type reactive oxygen species generator is a [3]-rotaxane formed by being included by two cyclodextrins or derivatives thereof. Also provided is the photosensitizer which is an anticancer agent.SELECTED DRAWING: None

The application belongs to the technical field of molecular machines, and particularly relates to a fluorine-containing rotaxane molecule and a preparation method and application thereof. The fluorine-containing rotaxane molecule of the application takes fluorine-containing crown ether as a cyclic molecule, and is also a fluorine-19 magnetic resonance signal source; takes a chain molecule containing a secondary ammonium salt cation as an axle, and can control the relaxation property of fluorine through the interaction with the fluorine-containing crown ether; and takes 3,5-substituted benzene derivatives as end-capping groups to prevent the fluorine-containing crown ether from falling off from the axle. The molecule can be used as a fluorine-19 magnetic resonance contrast agent, and based on the structure characteristics of the rotaxane, the motion of the molecule is limited to improve the sensitivity of magnetic resonance imaging, a paramagnetic metal is not needed, the fluorine signal is single and strong, and the structure is convenient for subsequent functionalization, so that a high-performance 19 F MRI contrast agent is provided.