166 results about "Polyrotaxane" patented technology

The invention discloses a polyrotaxane covalent organic framework material capable of regulating interlayer spacing through cyclodextrin and application of the polyrotaxane covalent organic framework material, and belongs to the technical field of biological medicine. The polyrotaalkylated covalent organic framework material is obtained by taking a cyclodextrin aromatic multi-amino inclusion compound and a (multi-aldehyde bipyridine) ruthenium (II) complex as structural units and carrying out copolymerization; the cyclodextrin aromatic polyamine inclusion compound is a beta-cyclodextrin p-phenylenediamine inclusion compound with a hydroxyl group or without a hydroxyl group; the (multi-aldehyde dipyridyl) ruthenium (II) complex is tris (4, 4 '-diformaldehyde-2, 2'-dipyridyl) ruthenium (II). The interlayer spacing of the polyrotaxane covalent organic framework material is greatly increased by utilizing a cavity of gamma-cyclodextrin, and meanwhile, the material has excellent photo-thermal and photodynamic activity, is positively charged, and can better adsorb negatively charged bacteria; and the hydrogel is good in biocompatibility and free of toxic and side effects, and has an excellent treatment effect on wounds infected with staphylococcus aureus.

The invention discloses polyrotaxane with controllable cyclodextrin coverage rate as well as a preparation method and application of the polyrotaxane, and belongs to the technical field of polyrotaxane materials. The preparation method comprises the following steps: dissolving alpha-cyclodextrin, 3-hydroxyadamantane-1-carboxylic acid and polyethylene glycol diamine in deionized water, refrigerating and assembling to form quasi-polyrotaxane, and blocking to obtain polyrotaxane; wherein the polyethylene glycol diamine is prepared from polyethylene glycol and N, N '-carbonyldiimidazole, and the cyclodextrin coverage rate of the polyrotaxane is directionally regulated and controlled by regulating and controlling the mass ratio of the alpha-cyclodextrin to the 3-hydroxyadamantane-1-carboxylic acid, the adding sequence of the 3-hydroxyadamantane-1-carboxylic acid and the refrigerating and assembling time. Based on the mechanism that 3-hydroxyadamantane-1-carboxylic acid and polyethylene glycol compete in a cyclodextrin cavity, polyrotaxane with a cyclodextrin coverage rate of 0.5-2.5% is synthesized, and a polymer based on the polyrotaxane has better ductility and mechanical properties.

The invention provides a mechano-electric coupling hydrogel microsphere with stable mechanical property and low loss transduction as well as a preparation method and application thereof, and belongs to the technical field of tissue engineering bioremediation materials. According to the invention, supramolecular engineering and microfluidic technologies are utilized, and a slip ring structure polyrotaxane and conductive polypyrrole network is introduced to construct stress-electric coupling hydrogel microspheres. The molecular slippage mechanism of the slip ring structure stores and releases mechanical energy to reduce mechanical loss, and the conjugated pi-electron movement in the conductive network improves the electron transfer efficiency in the microsphere, so that the loss in stress-electricity conversion is reduced for the first time. Compared with the traditional piezoelectric hydrogel microspheres, the stress-electric coupling efficiency of the low-dissipation microspheres is improved by 2.3 times, and the energy dissipation rate is reduced to 43%. The mechano-electric coupling hydrogel microspheres can reduce cartilage injury of rats, improve behavior results and promote treatment of osteoarthritis by recovering low-loss transduction between tissues.

The invention provides a high-flexibility stretchable transparent electrode and a preparation method and application thereof, and belongs to the technical field of flexible electrodes. The method comprises the following steps: spin-coating a metal nanowire dispersion liquid on the surface of a glass substrate to form a conductive film; spin-coating a polyrotaxane solution containing double bonds to form a PRA film; coating the elastomer precursor solution to form an elastic substrate; and after curing, stripping the elastic substrate from the glass substrate to prepare the high-flexibility stretchable transparent electrode. The method can be used for an electroluminescent device, a flexible touch screen and wearable flexible electronic equipment for detecting physiological electric signals of a human body. According to the invention, the metal nanowire is used as a conductive material, and isocyanate-modified polyrotaxane PRA is used as a cross-linking agent to be introduced into the nanowire and a transparent elastic substrate; when the electrode is stretched, cyclodextrin in the PRA can freely move on a polyethylene glycol long chain, and the stress concentration problem is effectively relieved, so that the fracture of the nanowire is reduced, the working range of the transparent electrode is widened, and the change rate of resistance is reduced.

To provide a composition in which a silicone-based polymer material and a plurality of polyrotaxanes are well mixed or dispersed.SOLUTION: Provided is a composition which contains: a silicone-based polymer material; and a plurality of polyrotaxanes, wherein each polyrotaxane has a plurality of cyclic molecules and a chain polymer that penetrates through the openings of the plurality of cyclic molecules, with a polysiloxane chain bonded to at least some of the plurality of cyclic molecules.SELECTED DRAWING: None

The invention relates to a secondary battery, a negative pole piece and an electric device. The secondary battery comprises a negative pole piece, the negative pole piece comprises a negative current collector and a conductive coating arranged on at least one surface of the negative current collector, the conductive coating comprises a conductive agent and a first binder, and the first binder comprises polyrotaxane.

This document relates to methods for preventing or inhibiting the cracking or explosion of cement in an oil well using cement compositions that contain polyrotaxane additives. The cement compositions containing the polyrotaxane additives exhibit increased resiliency to cracking as compared to the same cement without the polyrotaxane additive.

The invention relates to the technical field of waterproof coatings, in particular to a waterproof coating for a building exterior wall and a preparation method thereof, the waterproof coating comprises the following raw materials by weight: 50-60 parts of a vinyl acetate-ethylene copolymer emulsion, 10-15 parts of a composite emulsion, 0.1-0.3 part of a dispersant, 0.3-0.5 part of an antifoaming agent, 0.8-1 part of a coalescing agent, 58-62 parts of cement, 30-35 parts of heavy calcium carbonate and 30-35 parts of quartz powder; the composite emulsion is added into the raw materials of the waterproof coating, a polymer in the composite emulsion has a special semi-interpenetrating network structure taking a polyrotaxane structure as a cross-linking point, and a perfluorinated chain segment and a siloxane group are introduced, so that the problem of low bonding strength between the existing waterproof coating for the building external wall and a concrete substrate is solved; meanwhile, the mechanical property of the waterproof coating is improved, and the mechanical property loss caused by aging is reduced.

The invention relates to the technical field of conductive film substrate materials, in particular to a preparation method and application of a super-flexible stretchable conductive film substrate material. In order to solve the problems that an existing flexible conductive film is prone to fracture in the stretching process, a conductive layer is prone to stripping, and the conductive performance is seriously attenuated along with deformation, the invention provides a composite polyrotaxane enhanced matrix film which is capable of meeting the ultra-flexible and stretchable requirements. And an MXene-silver nanowire-polypyrrole ternary synergistic conductive network is combined, so that the problem that the conductivity is sharply attenuated in the deformation process is solved.

A thermally conductive and breathable membrane that oligo-layer graphene with a solid weight ratio of 1~30 wt% and a polyrotaxane with a solid weight content of 0.05 to 10wt% relative to the thermal conductive and breathable membrane to a polyurethane resin, in addition to the moisture permeability and waterproofness of polyurethane resin, the oligo-layer graphene also increase the thermal conductivity, and the dispersibility of oligo-layer graphene is improved by adding polyrotaxane and the extensibility of polyurethane resin is improved, making the formed thermal conductive and breathable membrane enable to maintain extensibility without increasing the membrane thickness.

The invention is suitable for the technical field of vehicle film production, and provides a high-wear-resistance anti-aging polyurethane vehicle film and a preparation method thereof.The vehicle film is prepared from a polyurethane matrix, modified composite filler, magnetic microcapsules and an anti-aging agent, the modified composite filler comprises dynamic bond grafted polyrotaxane, modified graphene oxide and photoresponsive hyperbranched polysiloxane, and the magnetic microcapsules are directionally distributed in a near-surface area of the vehicle film under the assistance of a magnetic field. According to the high-wear-resistance anti-aging polyurethane vehicle film provided by the invention, the coordination of dynamic wear resistance and light-operated self-repairing is realized through a polyrotaxane / modified graphene oxide / light-responsive hyperbranched polysiloxane ternary system, the anti-aging agent is a rare earth MOF loaded dopamine derivative, and the anti-aging function and the service life diagnosis function are integrated; the microcapsule containing the polyurethane prepolymer is compounded with a dynamic network of photoresponse hyperbranched polysiloxane and polyrotaxane to construct a dual self-repairing mechanism, and the anti-aging time can be prolonged.

The invention discloses a high-density flexible strain sensing array and a preparation method thereof, and belongs to the field of flexible strain sensors. The method comprises the following steps: modifying a titanium carbide nanosheet (MXene) by using a silane coupling agent containing sulfydryl to obtain sulfydryl-terminated MXene (S-MXene), modifying polyrotaxane (PR) by using isocyanate containing double bonds to obtain polyrotaxane (PRA) containing double bonds, and uniformly mixing the S-MXene and the PRA; preparing an S-MXene / PRA conductive film through a spraying technology or aerosol jet printing to obtain a sensing unit; and a lead and a pin are further introduced to construct a sensing array. Sulfydryl on the surface of S-MXene and double bonds on PRA cyclodextrin can form covalent bonds through heating or ultraviolet-induced click reaction. When the sensor is stretched, cyclodextrin in the PRA can freely move on a polyethylene glycol long chain, so that the stress concentration problem in the stretching process is effectively relieved, energy is dissipated, the crack size is reduced, the working range of the sensor is widened, and miniaturization of the flexible strain sensor is facilitated.

The invention discloses a fireproof flame-retardant fiber and a preparation method thereof, and relates to the field of fibers. The preparation method comprises the following steps: reacting beta-cyclodextrin with allyl succinic anhydride to prepare terminated beta-cyclodextrin during preparation of the fireproof and flame-retardant fiber; the preparation method comprises the following steps: reacting polyether amine with beta-cyclodextrin to prepare polypseudorotaxane; the polypseudorotaxane and the end-capped beta-cyclodextrin are subjected to a reaction, and polyrotaxane is prepared; the preparation method comprises the following steps: carrying out a reaction on polyrotaxane and allyl dichlorophosphine to prepare modified polyrotaxane; carrying out hydrolytic condensation on dimethoxymethylsilane to prepare an organic silicon monomer; reacting the polyester prepolymer with an organic silicon monomer to prepare modified polyester; and carrying out melt spinning on the modified polyester and the modified polyrotaxane. The fireproof flame-retardant fiber prepared by the invention has good flame retardant property, hydrophilic moisture absorption property and mechanical property.

The invention provides a polishing pad, a preparation method of the polishing pad and chemical mechanical polishing equipment. The waterproof buffer layer is arranged on one side, in the thickness direction, of the polishing layer, and the waterproof buffer layer is at least formed by compounding thermoplastic polyurethane, polyrotaxane and an anti-hydrolysis agent; and the back adhesive layer is arranged on one side, back to the polishing layer, of the waterproof buffer layer. According to the polishing pad, the waterproof buffer layer is formed by compounding the thermoplastic polyurethane, the polyrotaxane and the anti-hydrolysis agent, the polyrotaxane enables the waterproof buffer layer to maintain a stable buffer effect, shear stress borne by the adhesive layer is reduced, and the anti-hydrolysis agent can improve the chemical corrosion resistance of the polishing pad. The waterproof buffer layer is arranged between the polishing layer and the back adhesive layer, so that the polishing liquid absorbed by the polishing layer can be prevented from being transferred to the back adhesive layer, and the back adhesive layer is prevented from being corroded and losing efficacy. According to the polishing pad, the reliability can be improved, the service life can be prolonged, and the polishing cost can be reduced.

Bioderived pressure-sensitive adhesives. The present invention solves ongoing needs for further biofriendly adhesives. The role of mobile cross-links on the properties of a bio-friendly adhesive made using composites of cyclodextrin-based macromolecules and poly(lipoic acid) is demonstrated. Cyclodextrin-based hosts and polyrotaxanes with pendant groups of lipoic acid (a commonly ingested antioxidant) are modified to incorporate them as cross-links in poly(lipoic acid) networks obtained by simple heating in open air. By systematically varying the adhesive formulations while probing their mechanical and adhesive properties, trends in structure-property relationships that enable one to tune network properties and access bio-friendly, high-tack pressure-sensitive adhesives are shown. This invention provides bio-derived adhesive materials that are biofriendly and exhibit adhesion underwater. Multiple applications are possible including a pressure sensitive adhesive, a load bearing adhesive, an underwater adhesive, and adhesives for biomedical applications.

The invention relates to a boron hydride alkene / polyrotaxane composite interfacial film modified metal zinc negative electrode and a preparation method and application thereof, and belongs to the technical field of aqueous zinc ion battery negative electrode materials. The modified metal zinc negative electrode is composed of metal zinc and an inorganic-organic composite gel polymer interfacial film formed on the surface of the metal zinc through crosslinking of borohydride, polyrotaxane and polyacrylamide. The thickness of the interfacial film is 1-1000 [mu] m, and the interfacial film is uniformly modified on the surface of metal zinc through in-situ free radical polymerization. The inorganic-organic composite interfacial film has excellent mechanical strength, rich zinc-loving sites and relatively high ionic conductivity, and can also block direct contact between aqueous electrolyte and metal zinc, so that zinc dendrite growth and interface side reactions such as hydrogen evolution, corrosion and passivation can be effectively relieved. The interfacial film can significantly enhance the reversibility and cycling stability of the zinc negative electrode, the preparation process is simple and efficient, the operability is strong, and the method is green and safe, and is of great importance to the realization of an environment-friendly and sustainable aqueous zinc ion battery technology.

Disclosed herein are a supercontractible thin film comprising crystalline inclusion complex domains formed from poly(pseudo)rotaxanes or polyrotaxanes, and oriented polyethylene oxide domains physically crosslinked to the crystalline inclusion complex domains, wherein the poly(pseudo)rotaxanes or polyrotaxanes are formed from α-cyclodextrin and a polyethylene glycol having a number average molecular weight of from 500 to 10,000 Daltons, the polyethylene oxide has a number average molecular weight of from 200,000 to 10,000,000 Daltons, and the supercontractible thin film contracts by more than 50% of its original length upon wetting with water, a shape-adaptive supercontractile electrode and a shape-adaptive supercontractile electronic device. Also disclosed herein are methods of forming a supercontractible thin film, a freestanding film, and an electrode composite material.

The invention belongs to the technical field of coating preparation, and provides a modified polysilane epoxy hybrid coating and a preparation method thereof. Firstly, a polyrotaxane silane additive containing cyclic molecules is prepared through a supramolecular self-assembly and chemical end capping technology, the additive forms a unique network after a coating is cured, mechanical stress can be effectively dissipated, and the coating is endowed with ductility; secondly, a controllable free radical polymerization method is adopted, an acrylate copolymer is synthesized, dynamic hydrogen bond units densely distributed on a side chain of the acrylate copolymer form an efficient energy absorption network, and impact energy can be absorbed and dissipated on the microscopic level; in the preparation process of the coating, the epoxy resin, the copolymer and the pigment filler are finely ground and then mixed with auxiliaries such as polyrotaxane silane to prepare a component A; and mixing amino silicon oil with an amine curing agent and a catalyst to prepare a component B. The prepared coating has excellent flexibility and impact resistance while keeping high weather resistance.

The invention discloses a preparation method of an anti-pollution membrane based on amphoteric dynamic supramolecules, and belongs to the technical field of preparation of water treatment membranes. The method comprises the following steps: preparing a high-flux base membrane by a non-solvent induced phase separation method; the preparation method comprises the following steps: preparing an amphoteric supramolecule with a line-through-ring quasi-polyrotaxane structure through a solvent-induced self-assembly method; based on free radical polymerization reaction, amphoteric dynamic supramolecules are grafted to the surface of the base membrane to form an anti-pollution layer. A supramolecular structure formed by cyclodextrin and polydimethylsiloxane is combined with a hydrophilic and low-surface-energy micro-area synergistic anti-pollution mechanism, so that the anti-pollution performance and the water flux of the membrane are improved. The dynamic supramolecular structure has good anti-pollution performance, adapts to different flow velocity and temperature conditions, is high in flux and low in attenuation rate, and is suitable for various water treatment processes. The preparation process is simple, raw materials are easy to obtain, and the cost is low; the membrane flux is obviously improved, the anti-pollution capacity is enhanced, and the performance is easy to recover through simple cleaning; good adaptability is realized in a wide temperature range and a wide pH (Potential of Hydrogen) range.

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.

The present application discloses a high-performance MXene-based fiber and a preparation method thereof, and belongs to the field of functional fiber technology. The preparation method of the present application includes: wet spinning a mixed dispersion containing titanium carbide, (PEDOT:PSS) and polyrotaxane, and making the spinning primary titanium carbide / (PEDOT:PSS) / polyrotaxane composite fiber chemically crosslinked in an organic solvent containing N,N′-carbonyldiimidazole and electrostatically coupled in a cleaning bath, hot pressing and vacuum drying to obtain high-performance MXene-based fibers. The preparation method of the present application can construct a multi-structure synergistic titanium carbide / PEDOT / polyrotaxane composite fiber with obvious wrinkle structure, adjustable porous structure, titanium carbide / polyrotaxane dynamic roller skating interface structure and titanium carbide / PEDOT rigid interface structure, thereby achieving ultra-high tensile strength, elongation at break, flexibility, excellent tensile stability, conductivity and conductivity retention rate after cyclic strain of MXene-based fibers.

The present invention belongs to the field of biomedicine technology, and specifically relates to an mRNA delivery system targeting DC cells and a preparation method thereof. The present invention innovatively grafts two molecules, mannose and guanidine acetic acid, onto the cyclodextrin structure of a polyrotaxane through triethylenetetramine. The grafted mannose has a DC cell targeting effect, and the guanidine group in guanidine acetic acid has a potential cell penetration effect. Experimental results show that when the two are grafted onto the cyclodextrin structure of a polyrotaxane at the same time, the targeting accuracy and delivery efficiency of the delivery system for DC cells can be synergistically improved. The mRNA delivery system targeting DC cells prepared by the present invention not only enriches the research scope of nucleic acid delivery systems, but also provides strong technical support for biomedical fields such as tumor treatment.

An object of the present invention is to provide a composition having excellent surface impact strength and a method for producing a composition. The composition according to the embodiment of the present invention is a composition containing a cellulose derivative and a polyrotaxane, and is amorphous.

The invention relates to a secondary battery, a negative pole piece and an electric device. The secondary battery comprises a negative pole piece, the negative pole piece comprises a negative current collector and a conductive coating arranged on at least one surface of the negative current collector, the conductive coating comprises a conductive agent and a first binder, and the first binder comprises polyrotaxane.

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.

Provided is a pharmaceutical composition for use in inducing an antigen-specific immune response, the pharmaceutical composition comprising: a polyrotaxane having a plurality of macroring molecules, an axis molecule that penetrates the rings of the macroring molecules, and caps that bind to the ends of the axis molecule, in which at least some of the macroring molecules include an amine-containing group having a monovalent proton at neutral pH and a divalent proton at acidic pH; and an antigen.

The application discloses an epoxy resin polyrotaxane network lubricating material, a preparation method thereof and application of the epoxy resin polyrotaxane network lubricating material in preparation of biological lubricating materials. The epoxy resin polyrotaxane network lubricating material is obtained through ring-opening and curing reaction of a polyethylene glycol and cyclodextrin quasi-polyrotaxane, an epoxy resin monomer and a curing agent polyether amine. In the polyethylene glycol and cyclodextrin quasi-polyrotaxane, the molar ratio of the polyethylene glycol and the cyclodextrin is 1-100:1-2000; the molar ratio of the epoxy resin monomer, the curing agent polyether amine and the polyethylene glycol and cyclodextrin quasi-polyrotaxane is 100-2000:50-1000:0.1-200. The preparation method comprises the following steps: performing ring-opening and curing reaction of the polyethylene glycol and cyclodextrin quasi-polyrotaxane, the epoxy resin monomer and the curing agent polyether amine to obtain the epoxy resin polyrotaxane network lubricating material.

The present invention provides a polyrotaxane having a chemical structure in which an axial molecule represented by Formula (2) is threaded into a cyclodextrin ring in a compound represented by Formula (1). In Formula (1), CD is a cyclodextrin ring, L2 is a divalent organic group, L3 is an ethylene group or a propylene group, RA is a hydrogen atom or a C1-6 alkyl group, and m is an integer of 0 to 35. Provided that when L2 and N are linked by a double bond, RA is not present. In Formula (2), R is a hydrocarbon group larger than an inner diameter of the cyclodextrin ring, X is a divalent organic group, and a is an integer of 100 to 1000.

This invention discloses a polyrotaxane with controllable cyclodextrin coverage, its preparation method, and its applications, belonging to the field of polyrotaxane material technology. This invention involves dissolving α-cyclodextrin, 3-hydroxyadamantane-1-carboxylic acid, and polyethylene glycol diamine in deionized water and assembling them under cold conditions to form a quasi-polyrotaxane, which is then end-capped to obtain the polyrotaxane. The polyethylene glycol diamine is prepared from polyethylene glycol and N,N'-carbonyldiimidazole. The cyclodextrin coverage of the polyrotaxane is directionally controlled by adjusting the mass ratio of α-cyclodextrin to 3-hydroxyadamantane-1-carboxylic acid, the order of addition of 3-hydroxyadamantane-1-carboxylic acid, and the cold assembly time. Based on the mechanism of competition between 3-hydroxyadamantane-1-carboxylic acid and polyethylene glycol within the cyclodextrin cavity, this invention synthesizes polyrotaxanes with a cyclodextrin coverage of 0.5–2.5%, resulting in polymers with better extensibility and mechanical properties.