14 results about "Star-shaped polymer" patented technology

The invention discloses a preparation method of 21-arm star-shaped polymer photoresist film-forming resin as well as a product and application of the 21-arm star-shaped polymer photoresist film-forming resin. Beta-cyclodextrin is taken as a core, a 21-arm RAFT (reversible addition-fragmentation chain transfer) reagent CTA-R is designed according to a xanthate-mediated'arm first strategy ', and the 21-arm star-shaped polymer photoresist film-forming resin is synthesized by adopting an RAFT technology. The 21-arm star-shaped polymer photoresist film-forming resin prepared by the preparation method has the characteristic of narrow molecular weight distribution, and can effectively solve the technical problems of low resolution and low sensitivity of a resist.

The application provides a star-shaped polymer for promoting lung function repair and a preparation method thereof. On the basis of a hydroxyl chalcone, epoxy modification is performed to obtain an epoxidized chalcone, the introduced epoxy group is used to graft the epoxidized chalcone to amino groups on side arms of a star-shaped copolymer mother nucleus, and polyethylene glycol segments are grafted on the side arms of the star-shaped copolymer mother nucleus to increase water solubility, thereby improving the defects that the chalcone compound has a high melting point and is difficult to dissolve in water. In addition, the core of the star-shaped copolymer contains a cystamine structure, and the core is easy to undergo a reduction reaction in a living body, thereby promoting the degradation and absorption of the star-shaped polymer in the living body, and finally improving the anti-inflammatory activity of the star-shaped polymer and the effect of promoting lung function repair.

The invention discloses a binder for a silicon-based negative electrode and a preparation method and application thereof, the binder for the silicon-based negative electrode provided by the invention has a dynamic covalent cross-linked network structure, and comprises a star polymer composed of a core part and an arm part, the three-dimensional cross-linked network is formed by cross-linking the arm parts of the star polymer through dynamic covalent bonds and ion coordination bonds. The adhesive provided by the invention comprises a star polymer and a three-dimensional cross-linked network formed in the star polymer, and by constructing a three-dimensional network with high strength, high toughness, rapid self-repairing capability and excellent interface stability at the same time, dynamic covalent bonds and ion coordination bonds are utilized to synergistically act in charge and discharge processes, so that the self-repairing performance of the adhesive is improved; and stress dissipation and network self-repairing are realized, so that the volume effect problem of the silicon-based negative electrode is solved.

A star-shaped polymer which is a reaction product of the following components: a) 3-30 wt% of a polyamine with a number average molecular weight Mn in the range of 600 g / mol to 10.000 g / mol and an amine value between 200 and 1.400 mg KOH / g b) 40-90 wt% of a monofunctionalized polyether with a number average molecular weight Mn in the range of 100 – 10.000 g / mol that is amine reactive and is represented by structure (I): [R-(OCpHq)m-(OCrHs)n-(OCtHu)o-L]f-G', R is a aliphatic, aromatic or arylaliphatic hydrocarbon, p, q, r, s, t, u are integers each independently ranging from 2 to 16, m+n+o ≥ 3, f is 1 or 2, L is O or NH, G' is a residue of a diepoxide, diisocyanate, diacids and / or their anhydride, diester and dihalide derivatives, uretdione, di(meth)acrylate, α,β-unsaturated acid or their ester or anhydride, acetoacetate or bis(carbonate), c) 1-20 wt% of one or more aromatic anhydride, an aromatic monoacid and / or aromatic monoisocyanate; d) 1-20 wt% of one or more aliphatic or aromatic epoxide.

The invention discloses a low-temperature-resistant creep-resistant acrylic pressure-sensitive adhesive as well as a preparation method and application thereof. The invention discloses a low-temperature-resistant creep-resistant acrylic pressure-sensitive adhesive. Comprising the following components in parts by weight: 40 to 50 parts of 2-ethylhexyl acrylate, 25 to 35 parts of butyl acrylate, 10 to 15 parts of methyl methacrylate, 5 to 10 parts of vinyl acetate, 2 to 3 parts of acrylic acid, 0.5 to 1 part of hydroxyethyl acrylate, 0.5 to 2 parts of a functional aid, 0.5 to 1.5 parts of an isocyanate curing agent, 0.1 to 0.3 part of an initiator and 100 to 150 parts of a solvent, wherein the functional aid is a star-shaped polymer which takes pentaerythritol as a core and has a plurality of polyacrylate chain segments, and the chain ends of the star-shaped polymer are provided with epoxy functional groups. The low-temperature-resistant creep-resistant acrylic pressure-sensitive adhesive disclosed by the invention has excellent initial adhesion and peel strength in a low-temperature environment, also has high cohesive force at a relatively high temperature, and can effectively resist creep displacement under long-term shear stress.

The present invention relates to a multistage radical emulsion polymerization process for producing a polymer dispersion of discrete particles dispersed in water, thereby producing a novel star shaped polymer composition, where the wet and dry properties of the dispersion polymer obtained by radical emulsion polymerization in water are modified. The present invention also relates to its use in coating, textile and adhesive applications.

The application provides a water-setting film and a preparation method and application thereof, relates to the technical field of electronic device protection materials, and the water-setting film comprises a substrate layer and a structural adhesive layer; the structural adhesive layer comprises an interpenetrating copolymer network, the interpenetrating copolymer network comprises a first three-dimensional crosslinked network formed by intermolecular crosslinking and curing of a first polymer and a second three-dimensional crosslinked network formed by intermolecular crosslinking and curing of a second polymer; the first polymer comprises a linear polymer, and the linear polymer comprises a first polymerizable functional group; the second polymer comprises a hyperbranched polymer and / or a star-shaped polymer, and a terminal end of the second polymer comprises a second polymerizable functional group which is complementary to the first polymerizable functional group; and a covalent bond is formed between the first three-dimensional crosslinked network and the second three-dimensional crosslinked network through reaction of the first polymerizable functional group and the second polymerizable functional group. The water-setting film has high peeling force, high light transmission and low haze, excellent cohesive property and strong pressure self-repairing capability.

A star-shaped polymer which is a reaction product of the following components: a) 3-30 wt% of a polyamine with a number average molecular weight Mn in the range of 600 g / mol to 10.000 g / mol and an amine value between 200 and 1.400 mg KOH / g b) 40-90 wt% of a monofunctionalized polyether with a number average molecular weight Mn in the range of 100 – 10.000 g / mol that is amine reactive and is represented by structure (I): [R-(OCpHq)m-(OCrHs)n-(OCtHu)o-L]f-G', R is a aliphatic, aromatic or arylaliphatic hydrocarbon, p, q, r, s, t, u are integers each independently ranging from 2 to 16, m+n+o ≥ 3, f is 1 or 2, L is O or NH, G' is a residue of a diepoxide, diisocyanate, diacids and / or their anhydride, diester and dihalide derivatives, uretdione, di(meth)acrylate, α,β-unsaturated acid or their ester or anhydride, acetoacetate or bis(carbonate), c) 1-20 wt% of one or more aromatic anhydride, an aromatic monoacid and / or aromatic monoisocyanate; d) 1-20 wt% of one or more aliphatic or aromatic epoxide.

The application provides a preparation method of precision hetero-arm star-shaped polymers forming a close-packed spherical phase, and belongs to the technical field of polymer materials. Based on an iterative growth method and a modular synthesis strategy, a series of discrete hetero-arm star-shaped polymers based on polyhedral oligomeric silsesquioxane (POSS) with precise chemical structures and single molecular weights are constructed, and the hetero-arm star-shaped polymers can form a thermodynamically stable hexagonal close-packed spherical phase (HCP) in a bulk self-assembly process. The application designs a series of isomeric polymers for specific molecular parameters (such as volume fraction, topological structure, region configuration and block number) to eliminate the interference of other variables, and provides an ideal platform for quantitatively studying the role of the molecular parameters in the self-assembly process. The application can bridge the gap between experimental exploration and theoretical research, and will help to deeply understand the basic principles of block copolymer self-assembly, and provide guidance for rationally designing new functional polymer materials.

The invention discloses star-shaped four-arm glycidyl azide polymer (GAP) with a hyperbranched characteristic and a synthesis method of the star-shaped four-arm glycidyl azide polymer (GAP). The preparation method comprises the following steps: under the catalysis of a boron trifluoride complex, carrying out cationic ring-opening polymerization by taking bis (trihydroxymethyl) propane (DiTMP) as a multifunctional core initiator and taking epichlorohydrin (ECH) as a monomer to construct a star-shaped four-arm polyepichlorohydrin (DiTMP-PECH) precursor; and then performing efficient substitution on chlorine atoms in the molecular structure through sodium azide (NaN3) to obtain the hyperbranched star-shaped four-arm glycidyl azide polymer (DiTMP-GAP). The star-shaped polymer has relatively high end group functionalization degree and good structural uniformity, has the characteristics of a star-shaped topological structure and high azide group content, and provides a new way for molecular design of energetic polymers. The synthesis method is simple and convenient in process and controllable in condition, has good expandability, and is expected to show application potential in the fields of high-energy solid propellants and explosive adhesives.

This invention relates to an aqueous wetting and dispersing agent and its preparation method. The dispersing agent comprises a star-shaped polymer, functional carbon dots, a synergist, and deionized water. The star-shaped polymer is prepared by using pentaerythritol as a starting agent to prepare a six-arm initiator, and using MAA, HEMAP, and PEGMA as comonomers, and polymerizing under ATRP initiation conditions. The functional carbon dots are obtained by preparing carbon dots through hydrothermal reaction using citric acid, chitosan, and L-cysteine ​​as raw materials, followed by the reduction of silver ammonia to deposit silver ions on the surface of the carbon dots. The synergist is modified montmorillonite, which is obtained by intercalation modification of organomontmorillonite with acryloyloxyethyltrimethylammonium chloride, followed by polymerization reaction with acrylamide and 2-acrylamidododecyl sulfonic acid. In this invention, the star-shaped polymer is the main material, achieving efficient dispersion and rapid wetting of pigments and fillers; the functional carbon dots contain chitosan and are deposited with silver ions to provide continuous contact antibacterial properties; the synergist enhances the stability of the composite structure.

New star-shaped polymers comprising graft copolymer backbone arms, which e.g. are useful for delivering active agents and / or imaging agents to target cells or tissues.

The invention belongs to the field of biological medicine, and relates to preparation and application of a multi-arm star polymer and a protein / drug conjugate thereof. The invention provides a multi-arm star-shaped polymer taking cyclodextrin as a core. The star-shaped polymer taking cyclodextrin as the core is coupled and connected with an active pharmaceutical ingredient to obtain a star-shaped polymer conjugate. The star polymer with cyclodextrin as the core has one or more reaction sites, and compared with a macromolecular protein drug conjugate of a linear structure, the star polymer with cyclodextrin as the core not only can improve the loading capacity of proteins and drugs, but also can load various proteins and / or drugs at the same time, and exerts the synergistic effect of various proteins and drugs. The star-shaped polymer with cyclodextrin as the core is large in molecular weight, can prolong the in-vivo circulation time of protein, retains the biological activity of the protein, and can be used in the fields of tumor tissue protein drug delivery and the like.