10 results about "Self-healing hydrogels" patented technology

The invention discloses a performance-adjustable aramid nanofiber reinforced polyvinyl alcohol hydrogel and a preparation method thereof, and the preparation method comprises the following steps: S1, through a high-speed shearing sequential control method, realizing the conversion of aramid fibers from a micron level to a nano level; s2, dissolving and dispersing aramid fibers by using a mixed acid system to obtain an ANFs stock solution, dropwise adding deionized water into an ice bath, and centrifuging to obtain an ANFs aqueous dispersion system; s3, PVA, TA and ANFs are heated and stirred, and a uniform PVA / ANFs-TA mixed solution is obtained; the preparation method comprises the following steps: mixing a PVA solution with ANFs-TA, adding a borax solution into the mixed solution, heating, pouring into a mold to obtain PVA / ANFs-TA hydrogel, and adjusting the concentration of TA to obtain super-stretched hydrogel (TA 2%) and self-repairing hydrogel (TA 0.8%). The prepared self-repairing hydrogel solves the problems that a single hydrogel material is insufficient in mechanical strength and limited in self-repairing capacity; the super-stretching hydrogel can realize 50000% super-stretching rate and underwater long-term adhesion.

The invention relates to the technical field of building materials, in particular to light high-strength foamed concrete and a preparation method thereof. The light-weight high-strength foamed concrete is prepared from the following raw material components in parts by weight: 1000 parts of cement, 5 to 30 parts of a surfactant and 800 to 2200 parts of breakable self-repairing hydrogel. The crushable self-repairing hydrogel is crushed into particles during stirring and has fluidity, so that the cement and the surfactant are fully dispersed, when stirring is stopped, the hydrogel particles are re-coagulated, air, the cement and the surfactant brought in during stirring are locked, structural water in the hydrogel is gradually and slowly subjected to hydration reaction with the cement, and the cement and the surfactant are uniformly mixed. The hydrogel network is promoted to be dehydrated and shrunk through subsequent drying, micron-scale holes are formed, and the foam concrete material which is light in weight, high in strength and excellent in thermal insulation performance is successfully prepared through mutual cooperation.

The invention belongs to the technical field of flexible electronic equipment, and particularly discloses a self-repairing hydrogel pressure sensor and a preparation method thereof, and the preparation method comprises the steps: preparing self-repairing hydrogel containing boric acid ester bonds; the self-repairing hydrogel is injected into the two molds to be frozen and cured, and two interface transition layers are obtained; uniformly coating the surface of one side of one interface transition layer with carbon black to prepare a conductive layer; laying silver nanowires on the surface of one side of the other interface transition layer and then folding to obtain a capacitor layer with the silver nanowires in the middle; and arranging the conductive layer and the capacitor layer in a laminated manner to obtain the self-repairing hydrogel pressure sensor. The self-repairing hydrogel pressure sensor has high adhesive force and super stretchability, interface stripping can be avoided, meanwhile, the detection range can reach 70 kPa, the whole range of human physiological activities can be covered, the response time is smaller than or equal to 30 ms, and the dynamic motion monitoring requirement can be met.

The invention discloses an antioxidant polymer and a preparation method thereof as well as self-repairing hydrogel as well as a preparation method and application thereof, and relates to the technical field of hydrogel dressings. The preparation method of the anti-oxidation polymer comprises the following steps: adding a phenylboronic acid monomer, polyethylene glycol monomethyl ether methacrylate (PEGMA), an initiator, a second solvent and optionally 2-(methacryloyloxy) ethyl-6-methyl-4-ferrocene-2-thio-1, 2, 3, 4, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, the preparation method comprises the following steps: carrying out free radical copolymerization on raw materials including 1, 2, 3, 4-tetrahydropyrimidine-5-carboxylic ester (FM) to prepare the water-soluble antioxidant polymer. The preparation method comprises the following steps: firstly, synthesizing an antioxidant polymer with ferrocene and phenylboronic acid groups; the invention provides an antioxidant self-repairing hydrogel constructed by dynamic borate bonds. The hydrogel is prepared from common raw materials which are low in cost and easy to obtain, the preparation method is simple and efficient, the gel forming condition is mild, and the hydrogel has high application value.

The invention provides a lignin synergistically enhanced thermoelectric self-repairing hydrogel with a high Seebeck coefficient as well as a preparation method and application of the lignin synergistically enhanced thermoelectric self-repairing hydrogel. The preparation method comprises the following steps: modifying alkali lignin through polyethylene glycol to obtain lignin-polyethylene glycol, then adding the lignin-polyethylene glycol into a polyethylene glycol aqueous solution containing acrylate, acrylamide monomers, metal salt and an inorganic micromolecule thermoelectric material, stirring and uniformly mixing, and finally adding an initiator, stirring and polymerizing to obtain the thermoelectric material. The lignin synergistically enhanced thermoelectric self-repairing hydrogel with the high Seebeck coefficient is successfully prepared. The thermoelectric self-repairing hydrogel has excellent mechanical performance, self-repairing performance and thermoelectric conversion efficiency. According to the thermoelectric self-repairing hydrogel, anion migration is limited through carboxyl, cation conduction is enhanced through a polyethylene glycol chain segment, the anion and cation migration rate difference is bidirectionally increased, then the Seebeck coefficient is increased, and the Seebeck coefficient obtained through fitting calculation reaches 21.8 mV / K; the problems that an existing thermoelectric self-repairing hydrogel is low in seebeck coefficient and low in thermoelectric conversion efficiency are solved.

The application relates to the technical field of building materials, in particular to a light-weight high-strength foamed concrete and a preparation method thereof. The light-weight high-strength foamed concrete is prepared from the following components in parts by weight: cement 1000 parts, a surface active agent 5-30 parts and a breakable self-repairing hydrogel 800-2200 parts. The breakable self-repairing hydrogel is broken into particles and has fluidity during stirring, so that the cement and the surface active agent are fully dispersed; when the stirring is stopped, the hydrogel particles are re-coagulated, the air, the cement and the surface active agent brought in during the stirring are all locked, the'structural water' in the hydrogel gradually and slowly reacts with the cement, the subsequent drying promotes the water loss and shrinkage of the hydrogel network, micron-scale holes are formed, and the foamed concrete material with the light weight, the high strength and the excellent heat preservation performance is successfully prepared.

The present application relates to a kind of MXene-based ammonium glycyrrhizinate / konjac gum / borax self-repairing hydrogel and preparation method, belong to gel technical field.Firstly, concentrated hydrochloric acid and lithium fluoride are used to etch Ti3AlC2, and MXene nanosheet is obtained by multiple centrifugal washing, ultrasonic and vacuum drying.Ammonium glycyrrhizinate and konjac gum are prepared into hydrosol, and the dispersed MXene nanosheet sol is obtained by dispersing MXene nanosheet in the sol.Then, borax aqueous solution is added to the dispersed MXene nanosheet sol, stirred and ultrasonically dispersed, then heated to start boiling, stopped heating, and placed in room temperature environment to crosslink, to obtain MXene-based self-repairing hydrogel.The existence of multiple reversible hydrogen bonds and multiple reversible boron-oxygen bonds in the polymer chain segment and between the chain segments in the hydrogel enhances the interaction between the molecular chain segments in the hydrogel, significantly improves the mechanical properties and self-repairing properties of the hydrogel, and improves the conductivity, electromagnetic shielding property, antioxidant property and antibacterial property of the hydrogel, with good application prospect.

The application provides a preparation method of a supramolecular nanocomposite self-repairing hydrogel, and belongs to the technical field of supramolecular materials. The spatial structure of the hydrogel material is: or wherein B is an oligomeric silsesquioxane crosslinking agent, the general structure of which is R n Si n O 1.5n , wherein n=8, 10 or 12; A is a polymer network of the supramolecular hydrogel, the general structure of which is: ; and C is a multiple hydrogen bond interaction between the polymer network and the oligomeric silsesquioxane crosslinking agent. The application further provides a synthesis method of the oligomeric silsesquioxane crosslinking agent, which provides a brand-new strategy for preparing the hydrogel with excellent mechanical properties. The hydrogel material constructed by the application has the advantages of simple operation, mild conditions, high yield and good selectivity of the synthesis product, easy purification of the product, simple post-treatment, excellent mechanical properties of the obtained material, self-healing and shape memory functions.

The application belongs to the technical field of hydrogel preparation, and discloses a double-network self-repairing hydrogel based on dynamic imine bonds, and a preparation method and application thereof. The hydrogel is composed of a first network and a second network. The first network is a hydrophilic polymer network formed by radical copolymerization and covalent crosslinking of acrylamide and 2-acrylamide-2-methylpropanesulfonic acid in the presence of a chemical crosslinking agent. The second network is a dynamic reversible network formed by crosslinking of oxidized sodium alginate through dynamic imine bonds. The dynamic imine bonds are formed in situ by Schiff base reaction of amino groups on the first network and aldehyde groups on the oxidized sodium alginate chain. The obtained hydrogel can realize efficient autonomous self-healing at normal temperature and pressure, and has high water retention, good wet adhesion and stable strain sensing performance, and can be widely used in the fields of flexible strain sensors, wearable health monitoring devices, biomedical self-adhesive dressings and soft robots.

The invention provides a self-repairing hydrogel material as well as a preparation method and application thereof, and belongs to the technical field of intelligent macromolecules. The preparation method comprises the following steps: dissolving an initiator and a metal source in a polymer monomer aqueous solution, and carrying out a free radical polymerization reaction to obtain the self-repairing hydrogel material; the obtained hydrogel material comprises a nano-channel of a three-dimensional network structure, the nano-channel is rich in carboxyl with negative electricity, the carboxyl enables the nano-channel to be negatively charged so that the hydrogel material can selectively pass through cations, the nano-fluid channel can selectively enable the cations to pass through, and the self-repairing function is achieved through the metal coordination effect of metal ions and carboxyl. The self-repairing hydrogel material is used as a diaphragm to be applied to a hydrogel salinity gradient power generation system, salinity gradient energy can be converted into electric energy, the self-repairing performance is achieved, after complete self-repairing is carried out for 48 hours, the mechanical property is restored to 94% of the original mechanical property, the salinity gradient power generation performance is restored as early, and lasting and stable high-performance salinity gradient power generation can be achieved.