31 results about "Lower critical solution temperature" patented technology

The invention discloses a dynamic self-adaptive radiation refrigeration material which comprises the following components in percentage by mass: 15-30% of matrix resin, 40-60% of a ternary function system, 1-3% of a dispersing agent, 2-5% of a cross-linking agent and the balance of deionized water, the ternary function system is composed of a temperature-sensitive block copolymer, phase change microcapsules and rare earth doped infrared emission particles according to the mass ratio of (1-2): (2-3): (1-1.5). According to the refrigeration material, when the environment temperature is higher than the low critical solution temperature of the temperature-sensitive copolymer, the temperature-sensitive chain segment shrinks to expose the rare earth particles, so that high reflectivity of sunlight and high emissivity of an atmospheric window are realized, and refrigeration is enhanced; when the temperature is lower than the phase-change temperature of the phase-change material, the temperature-sensitive chain segments stretch and wrap the rare earth particles, the infrared emissivity is reduced, heat loss is reduced through phase-change heat release, the dual functions of efficient refrigeration in summer and heat loss reduction in winter are achieved, and the applicability of the coating in an area with the large temperature difference is improved.

The invention relates to the technical field of fire extinguishing agents, and discloses a temperature-sensitive microcapsule immersed fire extinguishing agent and a preparation method and application thereof. The fire extinguishing agent comprises a continuous phase and a dispersed phase, and the mass ratio of the continuous phase to the dispersed phase is 50-90%: 50-10%. Wherein the continuous phase is a high-boiling-point coolant, the dispersed phase is a temperature-sensitive microcapsule, a core material in the temperature-sensitive microcapsule is a low-boiling-point fire extinguishing agent, and a wall material is a temperature-sensitive copolymer with a low critical solution temperature (LCST) of 60-90 DEG C. The low-boiling-point fire extinguishing agent is coated with the temperature-sensitive microcapsules and dispersed in the high-boiling-point coolant, the timed release function is achieved according to the specific low critical solution temperature of the microcapsule technical wall material, and in the initial stage of a fire, the low-boiling-point fire extinguishing agent is intensively released to achieve rapid fire extinguishing; and then, the high-boiling-point coolant independently carries out lasting cooling, so that the problem of functional time sequence conflict is fundamentally solved, and the after-combustion resistance is remarkably enhanced.

To provide a technique that improves fixation of a medical device at a target site while maintaining the deliverability of the medical device through a biological lumen.SOLUTION: A medical device includes a base material layer and a coating layer formed on at least part of the base material layer, the coating layer having, at a distal end portion, a temperature-responsive region which contains a copolymer (A), the copolymer (A) comprising: a structural unit (A-1) derived from a temperature-responsive monomer having a lower critical solution temperature; a structural unit (A-2) derived from a hydrophilic monomer; and a structural unit (A-3) derived from a reactive monomer. The temperature-responsive region has a phase transition temperature that exceeds 37.0°C.SELECTED DRAWING: None

The invention discloses temperature response type high-temperature-resistant release paper and a preparation method thereof. The release paper comprises a first release layer, a resin isolation layer, a base material layer, a resin punching layer, a temperature-sensitive layer and a second release layer which are sequentially stacked. The PNIPAAm temperature-sensitive layer is additionally arranged on the outer side of the perforated resin isolation layer, when the temperature-sensitive layer is lower than LCST (lowest critical compatibility temperature), molecular chains of the PNIPAAm temperature-sensitive layer are in a stretched state and are large in size, the perforated holes can be blocked, and water circulation can be prevented, when the temperature is higher than LCST, the molecular chains of PNIPAAm are in a contracted state and are small in size, and the perforated holes can be blocked by the PNIPAAm temperature-sensitive layer. Moisture can freely enter and exit through the exhaust holes, so that the use of the release paper is not influenced, and higher temperature can be resisted; the method can solve the problem that the water content of the paper is greatly changed due to the fact that the perforated release paper is influenced by external humidity.

Design and applications of a class of water-soluble small molecules represented by formula 1. The molecules, in their dilute aqueous solutions, exhibit lower critical solution temperature (LCST) phase transitions near room temperature, inducing a temperature triggered switching of opacity. Further, disclosed is a scalable smart window, akin to a radiative energy management system, that can be incorporated into the built environment for imparting energy efficiency. The window fabrication is facile wherein the aqueous solution is sandwiched between two transparent glass panes to enable modulation of light and heat transmission. The dynamic window of present invention represents with multifarious applications in developing scalable, smart energy management systems for indoor building environments is envisioned to be a major contribution towards cost effective smart glass technologies.

A method for purifying a polymer solution is provided. In particular, the method ensures the separation of impurities from an oxazoline polymer solution by raising the temperature of the polymer solution above its lower critical solution temperature (LCST), where separation of a water-rich phase from a polymer-rich phase occurs. The phases are then separated, with the polymer-rich phase containing a lower amount of impurities than before separation.

This invention discloses a temperature-sensitive reversible interlocking toy adhesive, its preparation method, and its application. The adhesive, by weight percentage, comprises 25-35% temperature-sensitive polymer matrix, 8-15% nano-reinforcing phase, 3-6% reversible crosslinking agent, 10-18% tackifying resin, 1-3% ionic complexing agent, 0.1-0.3% preservative, and the balance deionized water. The temperature-sensitive polymer matrix is ​​a polyvinyl alcohol-grafted-N-isopropylacrylamide copolymer with a lower critical solution temperature of 38-45℃. The nano-reinforcing phase is a composite of nano-cellulose crystals and sodium montmorillonite. The reversible crosslinking agent is borax. The adhesive exhibits good bonding strength to ABS interlocking toys at room temperature. Immersing the bonded parts in 40-60℃ warm water for 1-6 minutes allows for non-destructive separation of the components, meeting relevant toy safety standards.

The present application relates to the technical fields of functional polymer materials and smart response polymer materials, and particularly relates to a branched polyamide and a preparation method thereof.The branched polyamide has a pyrrolidone ring on a main chain and is a dendritic hyperbranched structure; the lowest critical solution temperature of an aqueous solution of the branched polyamide changes with the concentration, and the lowest critical solution temperature changes in a range of 16-37 DEG C.The preparation method of the present application uses itaconic acid and a binary amine to first prepare a linear polyamide with a pyrrolidone ring on a main chain through a salt monomer method, and then forms a hyperbranched structure through thermal shock; the preparation method is simple, easy to post-treat and environmentally friendly.The prepared temperature-sensitive color-changing hyperbranched polyamide can provide different response temperature schemes to adapt to complex application scenarios.

The invention discloses an environment-friendly self-adaptive rheology modifier and a preparation method and application thereof, and the preparation method comprises the following steps: dissolving a thermal response monomer, an ionic monomer and a crosslinking accelerator in deionized water, and adjusting the pH value to 7.0-8.0; the thermal response monomer is N-vinyl caprolactam; the ionic monomer is one or a mixture of acrylamide and sodium 2-acrylamide-2-methylpropanesulfonate; the ionic monomer is one or a mixture of acrylamide and sodium 2-acrylamide-2-methylpropanesulfonate; raising the temperature to 60-70 DEG C in an inert protection atmosphere, adding an initiator and a molecular weight control agent, and reacting for 4-6 hours at a constant temperature; pouring the reaction liquid into acetone to precipitate, and performing vacuum drying to obtain a white polymer; the lowest critical solution temperature of the obtained environment-friendly self-adaptive rheology modifier is 28-35 DEG C, the low-temperature apparent viscosity increase rate is smaller than or equal to 25% (2-10 DEG C), the high-temperature viscosity increase rate is larger than or equal to 30% (40-160 DEG C), the filter loss is smaller than or equal to 15 mL (API standard), the Zeta potential is smaller than or equal to-39.4 mV, the average particle size is larger than or equal to 3480 nm (containing 2% of bentonite-based slurry), and the environment friendliness is as follows: the biotoxicity is EC50gt; and 9 * 10 < 5 > mg / L.

A temperature-sensing and humidity-controlling fiber includes a hydrophilic material and a temperature-sensing material. The temperature-sensing material has a lower critical solution temperature (LCST) between 31.2° C. and 32.5° C. when a light transmittance thereof is in a range from 3% to 80%, in which a wavelength of the light is between 450 nm and 550 nm.

The invention discloses a chitosan-based hydrogel contraceptive material as well as a preparation method and application thereof, and relates to the technical field of contraceptive materials. 3 to 10 weight percent of beta-sodium glycerophosphate; 0.5 to 3 wt% of polyacrylic acid; 0.1 to 5 wt% of a spermicide; 0.01 wt% to 0.1 wt% of silver nanoparticles; 0.1 to 1 wt% of chitosan oligosaccharide; a lactic acid bacteria metabolite: 0.05 to 0.5 wt%; the total percentage is 100%. The thermo-sensitive gelation mechanism is that chitosan is modified by a perfluoroalkyl chain, the perfluoroalkyl chain is a material with the lowest critical solution temperature (LCST), and the LCST of the perfluoroalkyl chain is 37 DEG C. The composite acting force of the spermicide and the gel matrix is intermolecular Van der Waals force and hydrogen bond.

A catalyst ink for plating and a method for electrochemically manufacturing an electronic device by using same are disclosed. The present invention provides a catalyst ink for plating, comprising: a polymer binder; a metal ion as a catalyst; a silane coupling agent for coupling the metal ion and the polymer; and a solvent, wherein the polymer has a lower critical solution temperature in the temperature-composition phase diagram for a solvent-polymer binary system, and the lower critical solution temperature is 30° C. or higher. According to the present invention, a high resolution plated pattern having a line width and a width between lines can be manufactured.

The present disclosure relates to a polymer compound which can provide a solution having the lower critical solution temperature when dissolved in a solvent containing a compound having a carbonate ester structure in the molecule. The polymer compound preferably contains 10-500 units inclusive per molecule of a structural unit A represented by formula (1) in the molecule, wherein R1 is a hydrogen atom or a methyl group, Z1 is -COO- or -OCO-, Z2 is an alkylene group having 1-8 carbon atoms inclusive, and L1 is a cationic group and L2 is an anion, or L1 is an anionic group and L2 is a cation.

A thermoresponsive smart window is provided. The window includes a first windowpane that is positioned at a first side 2024 / 076415 of the window, a second windowpane that is positioned at a second side of the window opposite the first side, and a gap between the first windowpane and the second windowpane. A thermoresponsive liquid mixture is within the gap. The thermoresponsive liquid mixture is configured to display a phase separation at a lower critical solution temperature such that the window is configured to dynamically and passively switch between a transparent state and a translucent state.WO

Synthetic biopolymers are disclosed that can be engineered according to both its amino acid sequence and its post-synthesis treatment to achieve desired gelation properties, particularly upon or after exposure to physiological temperatures (e.g., 37 DEG C), including their use in aqueous solutions comprising critical solution temperature agents, such as in the form of gel, or in the form of gel, or in the form of gel, or in the form of gel, or in the form of gel, or in the form of gel, or in the form of gel, or in the form of gel, or in the form of gel, or in the form of gel. The critical solution temperature agent increases the baseline lower critical solution temperature of the synthetic biopolymer solution, e.g., increases it above the physiological temperature for administration, and upon diffusion of the agent after administration, the lower critical solution temperature drops and the synthetic biopolymer forms a gel in the physiological environment. An example of a synthetic biopolymer is a synthetic elastin-like polypeptide (ELP) having a polypeptide sequence with a functional oligopeptide block, which may include one or more hydrophobic blocks, one or more aggregation enhancing blocks, and one or more beta-fold formation inducing blocks.

This invention provides a structural color smart window based on hydroxypropyl cellulose and its preparation method, belonging to the field of thermochromic hydrogel technology. The structural color smart window of this invention is prepared by mixing sodium lignosulfonate and hydroxypropyl cellulose, followed by self-assembly and sealing at room temperature. The structural color smart window prepared by this invention achieves synergistic control of the structural color and the lowest critical solution temperature (LCST) of the hydrogel. The process is simple and effectively solves the technical problems of excessively high response temperature and complex color control in traditional materials. By adjusting the content of sodium lignosulfonate, the LCST of the hydrogel can be precisely adjusted to a suitable operating temperature over a wide range, while simultaneously obtaining highly efficient transmittance modulation performance. The introduction of sodium lignosulfonate changes the state and distribution of water molecules in the gel network, achieving multicolor and reversible control of the structural color.

The invention discloses a novel chitosan-based temperature-sensitive concrete water reducing agent and a preparation method and application thereof, the lower critical solution temperature (LCST) of the chitosan-based temperature-sensitive concrete water reducing agent is in the range of 40-80 DEG C, and the lower critical temperature-sensitive stimulation-response process of the chitosan-based temperature-sensitive concrete water reducing agent is essentially changed along with the temperature. The dissolution-aggregation behavior of water reducing agent molecules in an aqueous solution is caused by the mutual competitive action among side chains consisting of alkyl polyoxyethylene groups on the side chains, chitosan groups, polyoxyethylene groups and-COO-on a main chain or among the side chains, the side groups and dissolved water. When hydration heat or friction stir results in the temperature Tgt of the material; during LCST, due to the action relation, the chitosan-based temperature-sensitive concrete water reducing agent is agglomerated in a cement concrete pore liquid to form a micelle-shaped structure, the aggregation of adsorbed cement particles and aggregates is more compact, and along with the release of hydration reaction heat, the working performance of the concrete under the change of internal temperature is actively micro-regulated and controlled; the strength of the concrete can be remarkably improved, and the condition that the concrete cracks due to temperature rise thermal expansion stress is improved.

The invention relates to a preparation method of a Ti < 3 > C < 2 > T < x > M < X > ene (at) PNIPAAm microwave absorption composite material, and belongs to the technical field of intelligent response type materials. The preparation method comprises the following steps: etching an MAX phase by adopting an excessive lithium fluoride-hydrochloric acid solution system to obtain a Ti < 3 > C < 2 > T < x > MXene dispersion liquid, and compounding Ti < 3 > C < 2 > T < x > MXene and a temperature-sensitive polymer through a free radical in-situ polymerization method to obtain the Ti < 3 > C < 2 > T < x > MXene-coated PNIPAAm microwave absorption composite material. The Ti3C2Tx MXene (at) PNIPAAm microwave absorption composite material is formed by mutual penetration of a two-dimensional nano material MXene and a temperature-sensitive polymer PNIPAAm, and the composite material can spontaneously change the forming state of a conductive path in the material above and below the lowest critical solution temperature by virtue of the characteristics of the temperature-sensitive polymer, so that the dynamic regulation and control on the microwave absorption capability of the composite material can be realized; the electromagnetic wave protection effect is excellent, electromagnetic pollution can be effectively reduced, and the method is suitable for complex electromagnetic environment protection scenes.

A photocurable composition includes a reactive polymer portion including a first polymer component including one or more alkenyl-functional siloxane polymers, a second polymer component including one or more thiol-functional siloxane polymers, a photoabsorber system and a photoinitiator system, each of which exhibits high absorbance at wavelengths in the range of ± 5nm from a wavelength at which photocuring occurs and low absorbance at wavelengths in the range of 420-680nm. A combination of the photoinitiator system and photoabsorber system exhibits a cumulative absorbance at wavelengths in the range of ± 5nm of the wavelength at which photocuring occurs that is at least 1000 times greater than the maximum absorbance at wavelengths in the range of 420-680 nm. The composition includes no solvent and has an upper critical solution temperature below 20 °C and a lower critical solution temperature above 60 °C. The composition is photocurable to form a transparent material.

A method of culturing cells for vaccine production comprises culturing cells in the presence of microcarriers with cell culture media and infecting the cells with a virus. The microcarrier comprises a bead and a coating. The coating comprises a thermo-responsive polymer having a lower critical solution temperature (LCST) of between about 20 °C and about 34 °C. The cells adhere to the coating of the microcarrier at a temperature above the LCST. The microcarrier comprises a polymeric bead, and a hydrophobic polymer. The hydrophobic polymer is a block copolymer which is connected to the bead by a covalent bond or by physical adsorption. The block copolymer comprises at least one hydrophobic block and at least one thermo-responsive block.

A method of culturing cells for vaccine production comprises culturing cells in the presence of microcarriers with cell culture media and infecting the cells with a virus. The microcarrier comprises a bead and a coating. The coating comprises a thermo-responsive polymer having a lower critical solution temperature (LCST) of between about 20 °C and about 34 °C. The cells adhere to the coating of the microcarrier at a temperature above the LCST. The microcarrier comprises a polymeric bead, and a hydrophobic polymer. The hydrophobic polymer is a block copolymer which is connected to the bead by a covalent bond or by physical adsorption. The block copolymer comprises at least one hydrophobic block and at least one thermo-responsive block.

The invention relates to the technical field of underground water chemical remediation, and discloses an underground water in-situ remediation method based on a slow-release nano-catalyst, which comprises the following steps: preparing a nano-catalyst coated with a polymer with a lower critical solution temperature on the surface, and configuring a molecular recognition group and a co-catalysis area on the surface of the nano-catalyst, according to the method, a target pollutant is selectively enriched by using a molecular recognition group, and a polymer is triggered to generate conformation phase change by virtue of heat generated by reaction of the molecular recognition group and a co-catalysis region, so that a catalytic active site is exposed to degrade the pollutant. The active state of the catalyst is directly coupled with existence facts of pollutants, so that the problem of mismatching of a preset slow release strategy and a dynamic pollution environment is solved, surface self-cleaning and activity regeneration are realized by utilizing a phase change process, and the effective life of a repair system is prolonged.

The invention provides a thermal response polymer, a preparation method and application thereof, and a cell encapsulation method, and relates to the technical field of biology. The preparation method of the thermal response polymer provided by the invention comprises the following steps: adding a chain transfer agent and an initiator into butanone dissolved with a monomer, and carrying out reversible addition-fragmentation chain transfer polymerization reaction to prepare the thermal response polymer. The preparation method is simple and convenient, and the thermal response polymer with the low critical solution temperature of 37 DEG C or below can be prepared by adjusting the monomer type and dosage proportion. The thermal response polymer is good in safety, can form a semi-interpenetrating polymer network with thiolated hyaluronic acid, and is further used for packaging stem cells, so that the limitation of an existing cell treatment method is solved.

The invention provides a PNIPAm-based composite hydrogel with a thermochromic characteristic and a preparation method thereof, and relates to the field of functional materials, and the preparation method comprises the following specific steps: S1, preparing a PNIPAm matrix solution; s2, preparing a mixed solution; s3, polymerization reaction; and S4, curing the mixed solution. The PNIPAm-based composite hydrogel with the thermochromic property is prepared by adding the sodium carboxymethyl cellulose and the tannic acid modified black phosphorus nanosheet and has good thermochromic property, the visible light transmittance can reach 71.2%-95.6%, the sunlight modulation efficiency can reach 70.2%-88.5%, and the low critical solution temperature is 28.9 DEG C to 30.5 DEG C. The invention further discloses a preparation method of the PNIPAm-based composite hydrogel with the thermochromic property.

The invention discloses a temperature-sensitive magnetic bead, a preparation method thereof and related application of the temperature-sensitive magnetic bead in early cancer screening, and the temperature-sensitive magnetic bead is prepared by taking an unsaturated superparamagnetic bead with vinyl on the surface as a matrix through an in-situ free radical polymerization mode. N-isopropylacrylamide, acrylamide and oligomeric (ethylene glycol) methyl ether methacrylate are initiated to be copolymerized on the surfaces of the magnetic beads to form a temperature-sensitive polymer brush layer with an adjustable low critical solution temperature (LCST). The temperature-sensitive magnetic beads are in a hydrophobic collapsing state under the condition of 37-39 DEG C, are maintained in a viscoelastic fluid state beneficial to dynamic replacement of low-abundance proteins, and can efficiently adsorb the low-abundance proteins in plasma; the temperature-sensitive magnetic beads are rapidly converted into a hydrophilic stretching state at the temperature lower than 36 DEG C, and the multi-point interaction between the proteins and the temperature-sensitive magnetic beads is synchronously weakened by utilizing micromechanical ejection force generated by phase change, so that the proteins are completely eluted from the surfaces of the magnetic beads.

The invention relates to the technical field of high polymer materials and functional textile fabrics, in particular to a waterproof breathable material, a fabric and a preparation method. The waterproof breathable material is formed by UV curing of a coating solution containing components such as a thermo-sensitive N-tert-butyl acrylamide-acrylamide copolymer, TEMPO oxidized nano cellulose, a hydrophobic finishing agent perfluorooctyltriethoxysilane and the like. The molar ratio of copolymer monomers is controlled to be (2.5-3.5): 1, and the low critical solution temperature (LCST) of the material is regulated and controlled to be 15-20 DEG C, so that the fabric has the intelligent response characteristics of low-temperature low breathability and high-temperature high breathability and meets the comfort requirement of a human body. Meanwhile, TOCNF is anchored to the fiber surface of the fabric base layer through covalent bonds and serves as a firm middle layer, and the interface bonding force and durability of the functional layer and the base material are greatly improved. The prepared fabric is remarkable in intelligent response and excellent in washing durability, and can be widely applied to the fields of outdoor clothes, medical protection and the like.

The present invention provides a medical instrument that can be removed from the body by a surgeon by appropriate force when necessary while ensuring smooth insertion into the body and stable retention (fixation) within the body. A medical instrument according to the present invention is equipped with a base material layer and a coating layer formed on at least part of the base material layer, wherein the coating layer includes a copolymer (A), having a structural unit (A-1) derived from a temperature-responsive monomer having a lower critical solution temperature and a structural unit (A-2) derived from a reactive monomer, and a polymer (B) having a structural unit (B-1) derived from a hydrophilic monomer, the ratio (molar ratio) of structural units (A-1) to the structural units (B-1) is from 1.5 to 9.0, and the phase transition temperature of the coating layer is less than 37.0° C.

The present disclosure generally relates to methods and systems for shear-thinning hemostats, for example, to use on a site of hemorrhage. In some embodiments, the hemostat is a solution comprising a polymer and a plurality of nanoparticles, where the solution is thixotropic, shear-thinning, and / or comprises a lower critical solution temperature. In some embodiments, the injectable hemostat is a liquid at 25° C. and a solid at 37° C. In some embodiments, the disclosure relates to injecting a solution into a site of hemorrhage in a subject, where upon injecting the solution, a plug is formed, thus limiting blood loss in the subject. In some embodiments, injecting the solution within the site of hemorrhage reduces the time for the plug to form, relative to sites not treated with the liquid solution.

This invention relates to the field of polymer materials and functional textile fabrics, specifically to a waterproof and breathable material, fabric, and preparation method. The waterproof and breathable material is formed by UV curing a coating liquid containing components such as a thermosensitive N-tert-butylacrylamide-acrylamide copolymer, TEMPO oxidized nanocellulose, and a hydrophobic finishing agent, perfluorooctyltriethoxysilane. This invention controls the molar ratio of copolymer monomers to (2.5~3.5):1, regulating the material's lower critical solution temperature (LCST) to 15-20℃, giving the fabric intelligent responsive characteristics of "low breathability at low temperatures and high breathability at high temperatures," meeting human comfort requirements. Simultaneously, the surface of the fabric's base layer fibers is covalently anchored to TOCNF, serving as a robust intermediate layer, greatly enhancing the interfacial bonding and durability between the functional layer and the substrate. The fabric prepared by this invention exhibits significant intelligent response and excellent wash durability, and can be widely used in outdoor clothing, medical protective clothing, and other fields.

The invention belongs to the technical field of wax plate preparation, and particularly relates to a cutting-edge-damage-free wax plate for carving and a preparation method of the cutting-edge-damage-free wax plate. The adhesive comprises the following raw materials in percentage by mass: 60%-70% of beewax, 30%-40% of paraffin, 2%-5% of plant ash, 5%-10% of lard, 5%-8% of corn starch and 3%-6% of dual-responsive hydrogel. The dual-responsiveness hydrogel is a PNIPAM copolymer, the low critical solution temperature of the dual-responsiveness hydrogel is 32 DEG C, and the elastic modulus of the dual-responsiveness hydrogel is increased by 15%-20% when the pH value is larger than 7 compared with the elastic modulus of the dual-responsiveness hydrogel when the pH value is smaller than or equal to 7. Compared with a traditional wax plate, the wax plate is easier to manufacture, the needed raw materials are scientifically proportioned, time and labor are saved during manufacturing, the labor cost is saved, by means of the physical characteristics of the PNIPAM hydrogel, the manufactured wax plate is not prone to melting and softening at the high temperature to affect carving, not prone to solidification and hardening at the low temperature, moderate in hardness during paper-cut work creation, and the paper-cut work is not prone to being damaged. The nicking tool is not damaged and the blade is protected.