11 results about "Polyrotaxane" patented technology

The application discloses a kind of annular spirofuran type polyurethane polyrotaxane and its preparation method, with rigid conjugated structure annular spirofuran derivative as macrocyclic host, with linear polyurethane chain as through axis molecule, and introduce end-capping group in polyurethane chain both ends, greater than annular spirofuran cavity, to constitute quasi wheelane of stable structure.Its preparation method mainly includes: first, synthesis of functionalized annular spirofuran macrocycle with through site;Then it is with isocyanate end-capped polyurethane prepolymer in solution by host-guest interaction and is penetrated to obtain target polyrotaxane.The material combines the rigidity, conjugation of spirofuran unit and the sliding crosslinking effect of polyrotaxane, and shows excellent thermal stability, mechanical properties and stimulus response characteristics.The polyrotaxane provided by the application is suitable for high-performance elastomer, intelligent shape memory material, damping material and optoelectronic functional composite material and the like fields.

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 present application belongs to the field of mechanical color-changing materials, and relates to a kind of polyrotaxane and its preparation method and mechanical color-changing material that can respond to weak force instantly and application.Polyrotaxane includes molecular ring and molecular shaft, molecular ring is provided with luminescent molecular group, and molecular shaft is provided with quencher molecular group;The luminescent molecule of the luminescent molecular group can be quenched;Each of the polyrotaxane provides two crosslinking sites, one of which is located on the molecular shaft, and the other is located on the molecular ring or luminescent molecular group.The present application synthesizes polyrotaxane with luminescent quencher on the molecular shaft and luminescent molecules on the molecular ring as crosslinking components, uses multi-arm polymer as matrix material to obtain reticular polymer material, and makes the material not luminescent in the relaxed state through the luminescent quencher on the molecular shaft, and the material changes color instantly due to the separation of the quencher and the luminescent molecules once the material is subjected to external force, and returns to the original color after the external force is removed.

A conducting composition includes a topological polymer (e.g., a polyrotaxane polymer) and poly(3,4-ethylene-dioxy thiophene):polystyrene sulfonate (PEDOT:PSS). Devices may include a conducting layer including the conducting compositions, e.g., a device comprising a conducting layer, wherein the conducting layer includes a polyrotaxane polymer and a PEDOT:PSS array. The devices are useful in bioelectronics, including high-resolution electrophysiological monitoring of deformable tissues and localized neuromodulation for high-precision control of individual muscle activities.

This invention relates to the field of solid electrolyte preparation technology, specifically to a solid electrolyte and its preparation method. The preparation method involves mixing raw materials to form a solid electrolyte, wherein the raw materials include Li₂O and polyrotaxane; wherein the preparation of Li₂O includes: placing an oxygen-containing lithium source at the positive electrode of an electric field in a reaction chamber, and evacuating the reaction chamber; introducing process gas into the reaction chamber, gradually increasing the discharge intensity of the electric field from 1-3 kW to 8-10 kW; maintaining the discharge intensity at 8-10 kW and stopping the introduction of process gas into the reaction chamber; reducing the discharge intensity to 3-5 kW and maintaining it, and introducing process gas into the reaction chamber to obtain Li₂O; the pressure in the reaction chamber is controlled at 10 kcal / kg during the preparation process. ‑1 ~10 3 Pa. This solves the problems of high grain boundary resistance and low ionic conductivity in existing composite solid electrolytes.

This invention discloses a polyrotaxane-functionalized basalt composite coating and its application, belonging to the field of high-performance composite material interface engineering and anti-corrosion coating technology. The composite coating comprises an epoxy resin matrix and polyrotaxane-functionalized basalt flakes dispersed therein. The functionalized basalt flakes consist of a basalt flake substrate and polyrotaxane molecules covalently grafted onto its surface via amide bonds. These polyrotaxane molecules are formed by a host-guest inclusion reaction between end-carboxyl-terminated polyethylene glycol and cyclodextrin, and the cyclic molecules can slide along the polymer axis. In preparation, the basalt flakes are first pretreated with acid and activated with a quaternary ammonium base, then grafted with amino groups. The synthesized end-carboxyl-terminated polyrotaxane is then grafted onto the flake surface via amide bonds, and finally dispersed in the epoxy resin. This invention constructs an interface buffer layer with mechanical interlocking and dynamic sliding characteristics between the filler and the resin, effectively alleviating stress concentration and delaying crack propagation. It possesses both high barrier properties and high toughness, making it suitable for metal protection in marine engineering, deep-sea equipment, and bridge steel structures.

This invention discloses a polyimide / indium tin oxide composite transparent conductive flexible thin film material enhanced by the molecular pulley effect and its preparation method, belonging to the field of polyimide thin film technology. This invention introduces polyrotaxane into a transparent polyimide matrix through a graft copolymerization reaction to construct a sliding crosslinking network, obtaining a polyrotaxane-reinforced polyimide material. A room-temperature magnetron sputtering process is used to deposit a nanoscale indium tin oxide thin film on the surface of the polyrotaxane-reinforced polyimide material, thus obtaining a flexible transparent conductive film on a polyimide substrate. The transparent conductive film prepared by this invention possesses both excellent conductivity and optical transmittance. After a 180° bending cycle fatigue test, it exhibits excellent stability and can be used as a flexible transparent electrode. It also possesses advantages such as good transparency, high strength, high toughness, anti-relaxation, and anti-creep, making it suitable for flexible optoelectronic devices such as flexible organic solar cells.

This invention discloses a low-temperature resistant high-elasticity rubber powder for asphalt and its preparation method, belonging to the technical field of rubber powder. Polyethylene glycol, 2,2,6,6-tetramethylpiperidine-1-oxy radical, sodium bromide, and sodium hypochlorite react to obtain carboxyl-terminated polyethylene glycol; the carboxyl-terminated polyethylene glycol and α-cyclodextrin are mixed and then reacted with adamantane, Carter's condensing agent, and N,N-diisopropylethylamine to obtain cyclodextrin-based polyrotaxane; the cyclodextrin-based polyrotaxane, sodium hydroxide, and 2,3-epoxypropyltrimethylammonium chloride react to obtain cationic cyclodextrin polyrotaxane; the cationic cyclodextrin polyrotaxane, lipoic acid, N,N'-dicyclohexylcarbodiimide, and 4-dimethylaminopyridine react to obtain disulfide-bonded polyrotaxane; the disulfide-bonded polyrotaxane is mixed and stirred with anhydrous ethanol and deionized water to obtain a modified polyrotaxane dispersion; waste rubber powder and the modified polyrotaxane dispersion are mixed and stirred to obtain high-elasticity rubber powder for asphalt.

This invention discloses a calcium-chelating polydopamine-polyrotaxane nanoparticle, its preparation method, and its application, comprising the following steps: (1) aging dopamine hydrochloride in an alkaline solution, centrifuging to obtain polydopamine nanoparticles; dispersing cyclodextrin and bis-thiol-terminated polyethylene glycol in water, stirring at 0-5°C to prepare polyrotaxane; (2) reacting the obtained polydopamine nanoparticles with polyrotaxane in an alkaline solution to obtain polydopamine-polyrotaxane nanoparticles; (3) stirring the polydopamine-polyrotaxane nanoparticles with calcium salt in an alkaline solution to obtain calcium-chelating polydopamine-polyrotaxane nanoparticles. The nanoparticles prepared by the above method have long-term stable photothermal conversion capabilities and high calcium loading capacity, and can be used for tumor treatment through photothermal effect synergistic controllable calcium overloading.