83 results about "Star-shaped polymer" patented technology

The invention discloses injectable hydrogels which are in the form of crosslinked nano beads or particle in the size range 5 nm to 10 μm, comprising PAMAM dendrimer with asymmetrical peripheral end groups such that one of the terminal groups is involved in formation of hydrogel and the other in involved in the conjugation of drugs or imaging agents and their methods of preparation. The said gel is formed by reaction of the PAMAM dendrimer with asymmetrical end groups with other polymer wherein the other polymer is selected from the group of linear, branched, hyperbranched or star shaped polymers with functionalized terminal groups. The PAMAM dendrimer with asymmetrical terminal groups consists of a Generation 2 and above PAMAM dendrimer with symmetrical end groups modified using the amino acids or their modified forms. The gel disclosed in the present invention is formed as small crosslinked particles in the size range 25 nm to 10 μm and is suitable for injectable delivery of hydrogel to any of the body orifices, tissues by intramuscular or subcutaneous route and ocular delivery for the purpose of therapeutic treatment and imaging.

The invention discloses an all-solid-state lithium-ion battery based on topological-structured polymer electrolyte. The all-solid-state lithium-ion battery is characterized by being formed by arranging and packaging a positive electrode material, the topological-structured polymer electrolyte and a negative electrode material in sequence, wherein the electrolyte is composed of a solid-state polymer matrix with a topological structure and lithium salt, and the polymer is a hyper-branched or star-shaped polymer matrix; the positive electrode material comprises a positive electrode active substance of a positive electrode piece, a conductive additive and an adhesive; and the negative electrode material comprises a negative electrode piece and a negative electrode active substance. The all-solid-state lithium-ion battery based on the topological-structured polymer electrolyte has the beneficial effects that the unique topological structure of the hyper-branched / star-shaped polymer can be used for reducing the crystallization performance of the polymer and thus introducing more chain segments with relatively good salt dissolving capability into a polymer structure, so that the conductivity of the polymer electrolyte is improved, good dissolubility and film forming property of the polymer electrolyte are also guaranteed, and the all-solid-state lithium-ion battery can express the effect very well.

A star-shaped polymer having an alkoxy silane end group and containing an ether group at the center thereof, which is represented by formula (I), is useful as a pore introducer to obtain a low dielectric silicate polymer film having nano-pores distributed regularly and evenly. The star-shaped polymer is prepared by comprising conducting a ring open polymerization of a cyclic monomer and a polyhydric alcohol, and reacting the resulting polymer with an alkoxy silane compound.

A lubricating oil composition comprising: (A) an oil of lubricating viscosity in a major amount, comprising a Group III base stock; (B) as an additive component in a minor amount, a viscosity index improver comprising a linear or star-shaped polymer which is derivable, at least in part, from the polymerisation of one or more conjugated diene monomers; and, wherein the lubricating oil composition is contaminated with at least 0.3 mass %, based on the total mass of the lubricating oil composition, of a biofuel or a decomposition product thereof and mixtures thereof.

The invention belongs to the technical field of biomedical polymer materials, and discloses beta-cyclodextrin based 21-arm star-shaped polymers as well as a preparation method thereof and a monomolecular micelle / gold nanoparticle hybrid material system based on the beta-cyclodextrin based 21-arm star-shaped polymers and an imaging application. The polymers have a structure represented by a following formula (1) in the description, wherein x is one selected from 4 to 20, y is one selected from 4 to 15, and z is one selected from 5 to 25. According to the invention, the ratio of each block of the polymers is easily regulated and controlled, so that monomolecular micelles with stable structures and small particle sizes can be prepared. The invention also provides gold nanoparticles with the small particle sizes and good stability prepared by an in-situ method based on the above polymer monomolecular micelle system, and the in-vitro CT imaging is realized, and the valuable preparation technology is provided for the future integrated treatment system.

The invention relates to a biodegradable medical polymer tubing and a preparation method thereof. The invention provides a biodegradable medical polymer tubing with adjustable diameter and controllable wall thickness and a preparation method thereof. The tubing is made from biodegradable medical polymer material, and has inner diameter of 0.5-20 mm and thickness of 0.05-10 mm; and the biodegradable medical polymer material is one of a homopolymer, a copolymer, a star-shaped polymer and a crosslinking polymer of trimethylene carbonate, p-dioxanone, lactide, caprolactone and glycollide.

The invention belongs to the fields of intelligent bionic materials, high-molecular materials and biomedical engineering, and concretely relates to a polydopamine particles-doped star-shaped polymer of a multi-responsive self-healing hydrogel, and the self-healing hydrogel and a preparation method thereof. In the present invention, the polydopamine nanoparticles and the star-shaped polymer SPDMAEMA-AA are prepared first; and the polydopamine nanoparticles, SPDMAEMA-AA and branched polyethyleneimine are mixed in proportion to form a crosslinked network by forming a dynamic reversible enamine bond through the acetoacetate on SPDMAEMA-AA and an amino group in the PEI molecules to obtain the hydrogel. The self-healing hydrogel material prepared by the invention has good near-infrared responsiveness, biocompatibility and high self-healing efficiency, and has potential applications in the fields of solid-state band-aids, drug slow release, cell culture, and a double-layer drive.

The invention discloses an anti-bacterium antivirus guanidine salt star-shaped polymer, a preparation method and applications thereof, and the arm number, structure and molecular weight of the star-shaped polymer are controllable. The polymer is prepared by the following steps: adopting a core-first method, taking brominated beta-cyclodextrin as an initiator, guanidine salt oligomer containing carbon-carbon double bonds as the functional monomers, and then carrying out atom transfer radical polymerization so as to obtain the target product, wherein the structure and molecular weight of the polymer can be modulated according to the application needs. The polymer and the preparation method thereof improve the molecular weight of the polymer, achieve chain amplification effect, increase the density of effective functional groups having an anti-bacterium effect, effectively solve the problems of contamination on other products caused by leakage of anti-bacterium agents and nondurable anti-bacterium effect, and eliminate the potential dangers caused by leaked anti-bacterium agents on human health. Furthermore, the polymer has a prominent function, which other guanidine salt polymers do not have, of killing wild type viruses and bacteria such as gland virus, influenza virus, and the like.

A non-aqueous pigment dispersion includes a pigment, a non-aqueous dispersion medium, and a polymeric dispersant including at least one oxalylamide structural unit according to Formula (I):wherein:R1 represents a first polymeric moiety selected from the group consisting of a linear polymeric moiety, a star shaped polymeric moiety, a dendritic polymeric moiety, a branched polymeric moiety, and a hyperbranched polymeric moiety; andR2 represents a second polymeric moiety selected from the group consisting of a polyester, a polyether, a polyamide, a polyacrylate, a polymethacrylate, or copolymers thereof.

The invention relates to technical field of degradation catalysis of pollute substance of waste water, in particular to a thermosensitivity recyclable metalloporphyrin visible light degradation catalyst and a preparation method thereof. An existing metalloporphyrin visible light degradation catalyst is bad in water-solubility and difficult to recycle. According to the thermosensitivity recyclable metalloporphyrin visible light degradation catalyst and the preparation method thereof, the light degradation catalyst is a star-shaped polymer, wherein divalent metal ions of the light degradation catalyst is Zn divalent metal ion, Co divalent metal ion or Fe divalent metal ion, and the molecular weight of the light degradation catalyst is ranged from 2000 to 15000. The preparation method of the thermosensitivity recyclable metalloporphyrin visible light degradation catalyst is an atom transfer radical polymerization method which comprises the following steps of: firstly, reaction between 5, 10, 15, and 20-4-hydroxyphenylacetic acid phenyl group porphyrin and metal acetate and generation of porphyrin metal complex, then, halogenating reaction between the porphyrin metal complex and halide and obtaining of atom transfer radical polymerization initiator, and thirdly atom transfer radical polymerization of N-isopropyl acryamide monomer initiated by the initiator and obtaining of an end product, namely the thermosensitivity recyclable metalloporphyrin visible light degradation catalyst. The prepared catalyst is good in water-solubility, capable of adapting to aqueous medium waste water degradation system, and capable of being recycled completely, simply and without being damaged.

The invention relates to a novel method for preparing a high stable nano-gold sol under the condition of aqueous phase by one step. In the method, the aqueous solution of polymethacrylic acid 2-dimethylamino acetate star-shaped polymer is mixed with the aqueous solution of chloroauric acid for reacting at room temperature and the high stable nano-gold sol is obtained. The method is characterized in that the nano-gold sol is prepared at the room temperature, no extra reducing agent or energy is needed, the process is simple and the cost is low; the nano-gold sol is impurity-free, non-toxic and high stable, the particle diameter is small and the particles are distributed evenly. In the invention, no organic solvent is used, thereby meeting the requirements of environmental protection. The gold sol prepared by adopting the method of the invention can be used in the fields of bio-medical treatment, environmental protection, catalysis, coating material, sanitizers, etc.

This invention is an improvement in standard polymerizations procedures, i.e., addition-type and step-growth type polymerizations, wherein momomers are reacted to form a growing polymer chain. The improvement includes employing an effective amount of a trifunctional monomer (such as a trifunctional amine, anhydride, or phenol) in the polymerization procedure to form a mixture of polymeric materials consisting of branced polymers, star-shaped polymers, and linear polymers. This mixture of polymeric materials has a lower melt temperature and a lower melt viscosity than corresponding linear polymeric materials of equivalent molecular weight.

The invention discloses a preparation method of an eight-arm heteroarm star-shaped polymer. A polystyrene lithium compound is synthesized through a living anionic polymerization method, and then subjected to an addition reaction with monohydroxy heptaethylene polyhedral oligomeric silsesquioxane in benzene to obtain a seven-arm star-shaped polystyrene crude product; slightly excessive low addition products are removed by utilizing a fractional precipitation method, thus pure monohydroxy functional seven-arm star-shaped polystyrene can be obtained, and hydroxyls of the pure monohydroxy functional seven-arm star-shaped polystyrene are subjected to azide modification to obtain seven-arm star-shaped polystyrene containing azide groups. On the other hand, polycaprolactone, polyethylene glycol, polymethylacrylic acid-N, N-dimethylamino ethyl ester, and tert-butyl methacrylate of which the ends contain alkynyls are respectively synthesized, and subjected to cycloaddition reaction with alkynyls and azides at the generating end of the seven-arm star-shaped polystyrene containing the azide groups to obtain the product; the method has the characteristics of high reaction efficiency, mild reaction conditions and few side reactions. The star-shaped polymer prepared by the invention is controllable in structure and molecular weight, and relatively narrow in molecular weight distribution.

The invention discloses a structure-controllable water soluble star-shaped polymer with beta-cyclodextrin being a core. A preparation method includes: S1) performing a reversible addition-fragmentation chain transfer polymerization reaction to synthesize the structure-controllable water soluble star-shaped polymer which is narrow in molecular weight distribution, and performing sulfhydryl conversion to the chain terminal; S2) modifying a beta-cyclodextrin core to introduce a C=C bond; S3) performing a sulfhydryl-alkene click chemical reaction to graft the chain polymer onto the modified beta-cyclodextrin core to form the structure-controllable water soluble star-shaped polymer with beta-cyclodextrin being a core. In the method, the reaction monomer is acrylates or acrylamides, and the chain transfer agent is dithio ester or trithio ester. The polymer is prepared in a manner of "firstly arm and secondly core", wherein all the polymer arms have been accurately represented before "core connection", so that the polymer has controllable and definite structure and the uniformity of the polymer arms is guaranteed; in addition, by regulation of the arm-core ratio of the polymer, the numberof the arms is controllable.

Provided is a metal nanoparticle composite that has excellent stability over time and shelf life and is useful as a starting material for a metal nanoparticle dispersed film. Also provided is a method for producing the same, a metal nanoparticle dispersion, a composition for forming a metal nanoparticle dispersed film, and a metal nanoparticle dispersed film. The metal nanoparticles are obtained by supporting metal nanoparticles (B) in a star-shaped polymer (A) having a central nucleus and arms joined to the central nucleus, wherein the arms comprise repeating units represented by the following general formula (1) and repeating units represented by the following general formula (2). (In formula (1), R1 is a hydrogen atom or C1-4 alkyl group and in formula (2), R2 is a methyl or ethyl group and k is an integer between 1 and 10.)

The invention discloses a preparation method of an amphipathic star-shaped block polymer with ultra-high pH stimulus-response. The preparation method is characterized by comprising the following steps: preparing a star-shaped atom radical polymerization reaction initiator based on cyclodextrin; preparing ultra-high pH sensitive star-shaped polymer; preparing an amphipathic star-shaped polymer; preparing a pH sensitive star-shaped polymer; preparing a pH sensitive amphipathic star-shaped polymer; and preparing an amphipathic star-shaped polymer loaded with near infrared fluorescent molecules. The drug loading capacity and stability of micelles can be improved, the sizes of nano micelles are changed, the problems of low drug load capacity of a current drug delivery system and selective controlled release of drugs are solved, and thus, accurate diagnosis and effective treatment of tumors become possible.

The invention discloses a preparation method of a cyclodextrin terminated star-shaped polymer. The method includes the steps of: under anhydrous and oxygen-free conditions, using dipentaerythritol asthe initiator, using stannous isooctanate as the catalyst to carry out ring-opening polymerization reaction on epsilon-caprolactone so as to obtain six-armed polycaprolactone, and then carrying out esterification reaction on p-aminobenzoic acid to obtain an arylamine terminated six-armed star-shaped polymer, and then further carrying out addition-dehydration reaction with cyclodextrin monoaldehyde, thus obtaining the imine group chained and cyclodextrin terminated six-armed star-shaped polymer. According to the method, cyclodextrin is disposed at the terminal of the star-shaped polymer, the prepared product not only has the three-dimensional structural characteristics of the star-shaped polymer itself, but also can better retain the advantages of the cyclodextrin chamber and cavity surrounding structure, thus enlarging the application range. The invention expands the types of star-shaped cyclodextrin polymers. The preparation method has the advantages of simple operation, mild reactionconditions, and simple product post-treatment, and is beneficial to realization of industrial production.

The invention relates to four-arm star-shaped polystyrene, a honeycomb porous membrane made of the same and a preparation method of the honeycomb porous membrane. The four-arm star-shaped polystyrene is prepared from the following raw materials in parts by weight: 1 part of component A, 10-2000 parts of styrene, 0.1-50 parts of azobisisobutyronitrile and 10-2000 parts of cyclohexanone, wherein the component A comprises the following ingredients in parts by weight: 1 part of pentaerythritol, 1-100 parts of BDAATC and 1-500 parts of dichloromethane. The honeycomb porous membrane provided by the invention is prepared from the raw materials: 0.5-10 parts of four-arm star-shaped polystyrene and 100 parts of dichloromethane. The honeycomb porous membrane provided by the invention has the characteristics of simplicity in preparation process, good solubility and orderliness and the like; the tail end of the polymer is provided with active groups so that the further modification can be carried out; the raw materials are cheap and are easy to obtain.

The invention discloses a positive electrode active material of a lithium-ion battery, and a preparation method and application of the positive electrode active material. The method comprises the following steps: mixing a star-shaped polymer dispersion liquid with a positive electrode active substance to obtain a lithium-ion battery positive electrode active material, wherein the number of branched chains of star-shaped polymer in the star-shaped polymer dispersion liquid is more than or equal to 3, and the number of C atoms in each branched chain is more than or equal to 10. The problems thatin the prior art, the true density of a positive electrode active material is high, the density of carbon materials such as graphite is low, and sedimentation is extremely likely to be caused in theactual industrial production process are solved. The invention develops a method for solving the settlement problem of the positive electrode active material without using maleimide-barbituric acid. The method is simple in process; and the prepared material has excellent electrochemical performance, and the lithium-ion battery prepared from the material has relatively high energy density and relatively high capacity retention ratio.

The invention discloses a star-shaped cationic graphene dispersing agent and applications thereof. According to the dispersing agent, a star-shaped initiator initiates the polymerization of an acrylate monomer to obtain a star-shaped polymer; the star-shaped polymer reacts with an imidazole compound in an inert atmosphere to obtain a star-shaped cationic graphene dispersing agent; and the star-shaped cationic graphene dispersing agent is added into a solvent, graphene is added, and dispersing is performed to obtain the graphene dispersing system. According to the invention, the prepared dispersing agent is a star-shaped polymer, has a special topological structure, has strong entropy protection effect and obvious steric hindrance effect, and has obvious advantages in dispersion of graphenecompared with linear polymers.

The invention discloses a beta-cyclodextrin based star-shaped polymer and a preparation method thereof. The structural formula of the beta-cyclodextrin based star-shaped polymer is as shown in the specification, wherein x and y respectively represent degree of polymerization of monomers and each range from 30 to 80. Beta-cyclodextrin with polypeptide branch can form clathrate compound with related molecular drug to improve solubility and bioavailability of the molecular drug. As polypeptide with good biocompatibility and biodegradability cannot accumulate in the body, the material itself or degradation products have no toxic or side effect to the body.

Provided are absorbing articles comprising water absorbing resin capable of exhibiting a high elastic modulus of a swollen gel while maintaining a high swelling capacity and a method for producing the same. The above-described problems are solved by an absorbing article comprising water absorbing resin including a water-soluble unsaturated monomer, which has a dissociable group, as a main component in a repeating unit of a main chain and having an internal cross-linked structure, in which a cross-linked structure index represented by the following Mathematical Formula 1 is 14 or more, a weight average molecular weight (Mw) after hydrolysis treatment is 220,000 or less, and a molecular weight distribution (Mw / Mn) after hydrolysis treatment is 3.40 or less: [Mathematical Formula 1] Cross-linked structure index = (Equilibrium swelling capacity with respect to 0.9% by weight of brine)1 / 3 / (Weight average molecular weight (Mw) after hydrolysis treatment) 1,000,000. Further, the absorbing article comprising water absorbing resin is produced by, for example, a method for producing a water absorbing resin which includes a reaction step of mutually reacting a first star-shaped polymer which includes the water-soluble unsaturated monomer as a main component in a repeating unit of each branched chain and has a first reactive functional group at the terminal of each branched chain and a second star-shaped polymer which includes the water-soluble unsaturated monomer as a main component in a repeating unit of each branched chain and has a second reactive functional group, which can form a chemical bond by mutually reacting with the first reactive functional group, at the terminal of each branched chain.

The invention discloses a low-size high-viscous-force hot-melt pressure-sensitive backing adhesive. The backing adhesive is prepared from the ingredients in percentage by weight: 0% to 20% of star-shaped polymer A, 0% to 20% of polymer B, 15% to 55% of special tackifying resin, 10% to 40% of plasticizer and 0.1% to 2% of antioxidant. According to the low-size high-viscous-force hot-melt pressure-sensitive backing adhesive, all-hydrogenated petroleum resin and star-shaped SBS are replaced with partially-hydrogenated petroleum resin, and the partially-hydrogenated petroleum resin is mixed with linear SIS; in addition, by a reasonable ingredient formula and a preparation method, the effects that the size of the backing adhesive is remarkably lowered, the thickness of the backing adhesive is reduced, and meanwhile, the viscous force of the hot-melt pressure-sensitive backing adhesive is greater are achieved.

The invention discloses a novel quick separation method of bacilluscereus, which provides the basis for the subsequent research for a target bacterium and relates to the technical field of biology. The novel quick separation method comprises the steps of: carrying out covalent coupling on a multi-arm star-shaped polymer and an antibody, coating the antibody-modified multi-arc star-shaped polymer on a long-chain biotin molecule, capturing the target bacterium in a sample solution by the antibody and long-chain biotin co-modified multi-arc star-shaped polymer, recognizing and coupling the long-chain biotin multi-arm star-shaped polymer in the sample solution by a streptavidin-modified nano magnetic bead, separating and heavily-suspending the captured bacterium; a heavily-suspended liquid can be directly analyzed in subsequent. Compared with a conventional bacterium magnetic separation method, the novel quick separation method is more suitable for carrying out magnetic separation on the bacterium in a complex matrix; the separation efficiency of the target bacterium in a sample is increased.

The invention provides a method for preparing a submicron pore diameter polymer porous membrane, and belongs to the technical field of chemical engineering and materials. At first, through the mutual static electricity effect, cation chain transfer agents containing trithiocarbonate groups are modified onto the surface of multi-metal oxygen clusters to obtain a compound of the cation chain transfer agents and the multi-metal oxygen clusters; further, through a reversible addition-fracture chain transfer polymerization reaction, polystyrene is grafted onto the outer peripheries of the compounds to obtain star-shaped polymers using the multi-metal oxygen clusters as the cores and the polymer as the arms; finally, the star-shaped polymers are used as precursors, and the polymer porous membrane is prepared by a water dripping template method. On the other hand, as a water drip stabilizing agent, the water drips can maintain the small dimension, so that the submicron pore diameter polymer porous membrane can be formed. The polymer porous membrane prepared by the method has application prospects in the fields of separation and soft templates.

Production of star-shaped polymer with ionic iridium complex as nucleus and ATRP is simple and cheap. It can be used for organic polymer phosphorescent electroluminescent material, chemical biological sensor inspection, fluorescent micro-sphere material, and its has controllable molecular weight and structure.

The invention discloses a doxorubicin structure-containing star-shaped polymer and a preparation method and use thereof. The doxorubicin coupled star-shaped polymer has a better effect on treatment of age-related macular degeneration compared with drugs or medicaments in other forms.

The invention discloses a high-temperature-resistant star-shaped polymer filtrate reducer, a preparation method thereof and a water-based drilling fluid, and relates to the technical field of oilfield chemistry. The high-temperature-resistant star-shaped polymer filtrate reducer comprises at least one of star-shaped polymers as shown in structural formulas (I), (II), (III), (IV), (V) and (VI). The star polymer contains rich anion and cation functional groups, shows an anti-polyelectrolyte effect and has excellent salt pollution resistance. Groups on a branched chain structure influence each other, and the high-temperature stability is enhanced. The stability of the polymer is further improved due to the steric hindrance effect among the branched chains. At high temperature, the secondary structure can still meet the requirement, the relative molecular mass is stable, and meanwhile, due to secondary groups generated by molecular breakage, the effective number of groups on a molecular chain is guaranteed. The high-temperature-resistant star-shaped polymer filtrate reducer can resist the temperature of 260 DEG C, the filter loss reduction rate is greater than 70%, and the high-temperature-resistant star-shaped polymer filtrate reducer can resist the pollution of 30% NaCl.