355 results about "Amphiphilic copolymer" patented technology

The invention relates to sutures and surgical staples useful in anastomoses. Various aspects of the invention include wound closure devices that use amphiphilic copolymer or parylene coatings to control the release rate of an agent, such as a drug or a biological material, polymerizing a solution containing monomers and the agent to form a coating, using multiple cycles of swelling a polymer with a solvent-agent solution to increase loading, microparticles carrying the agent, biodegradable surgical articles with amphiphilic copolymer coatings, and sutures or surgical staples the deliver a drug selected from the group consisting of triazolopyrimidine, paclitaxol, sirolimus, derivatives thereof, and analogs thereof to a wound site.

Vesicles made from amphiphilic copolymers are disclosed. The amphiphilic copolymers can be ABA copolymers, where one of A and B is hydrophilic and the other is hydrophobic. AB copolymers can also be used. The copolymers may be crosslinked to form nanocapsules. Crosslinking can be accomplished using a variety of methods, including end to end polymerization of copolymers having terminal unsaturated groups. Molecules, such as membrane proteins, can be incorporated into the wall of the vesicles or nanocapsules.

An implantable biological device including a semipermeable membrane formed into a geometric shape capable of encapsulating biological cells and capable of immunoisolating the biological cells upon introduction into the body, the semipermeable membrane including an amphiphilic copolymer network having hydrophobic segments and hydrophilic segments, wherein the hydrophobic segments include polyolefins terminated with radicals selected from the group consisting of acryloyl groups, methacryloyl groups and mixtures thereof and wherein the hydrophilic segments include polyacrylates. Also provided is a method of encapsulating and immunoisolating cells using the semipermeable membrane and method of treating ailments using the implantable biological device.

The invention discloses a method of producing the hyperfiltration membrane of amphiphilic copolymer modified polyvinylidene fluoride, comprising the following steps: 1) mixing polyvinylidene fluoride, poly (methyl methacrylate - monomethyl ether polyoxyethylene methyl methacrylate), additives, non-solvent and solvent to form the casting film solution; 2) making the casting film solution into the polyvinylidene fluoride membrane by using the film forming machine and then soaking in the coagulation bath; 3) conducting the posttreatment of hydrophilicity; 4)obtaining the hydrophilic polyvinylidene fluoride ultrafiltration membrane after cleaning and drying. The method is characterized in that the brush shape, chain ball shape or dumbbell shape amphiphilic copolymer are mixed with the polyvinylidene fluoride to produce the polyvinylidene fluoride hyperfiltration membrane with hydrophilicity, anti-pollution, large flux and high retention rate by adopting the solution phase conversion method. The method has the advantages that the obtained membrane is provided with dozens to hundreds nanometer of particular densified hydrogel surface layers, the contact angle of the membrane surface can be reduced below 60 degrees and can be lowered to 0 degree within tens of seconds, the water flux can reach 1000L /m<2>/ h (0.1Mpa) or above, the retention rate of BSA can reach 90% or more and the recovery rate of water cleaning flux can reach 90% or higher.

The disclosure pertains to amphiphilic block copolymers comprising an aliphatic polycarbonate chain coupled to a hydrophilic polymer. Such amphiphilic polymers may have the formula A-L-B, where A- is a polycarbonate or polyethercarbonate chain having from about 3 to about 500 repeating units, L is a linker moiety and —B is a hydrophilic oligomer having from about 4 to about 200 repeating units. Provided copolymers are useful as surfactants capable of emulsifying aqueous solutions and supercritical carbon dioxide. Provided copolymers also have utility as additives for use in enhanced oil recovery methods.

The invention discloses a preparation method of a polyvinylidene fluoride hollow fiber composite microporous membrane which has strong interfacial bonding force. The preparation method comprises the following steps: 1) neutral or amphiphilic substances which have good bonding force with braided fiber tubes and the polyvinylidene fluoride are prepared into dilute solution; 2) the dilute solution of the neutral or amphiphilic substances is coated once on the braided fiber tubes; 3) casting membrane liquid is used for secondary coating on the coated braided fiber tubes, and the polyvinylidene fluoride hollow fiber composite membrane is obtained by a solution phase transition method; 4) post-hydrophilization treatment is carried out; 5) the polyvinylidene fluoride hollow fiber composite membrane is cleaned and dried to obtain the hydrophilic polyvinylidene fluoride hollow fiber composite microporous membrane. The preparation method takes the braided fiber tubes as supporting tubes, uses an amphiphilic copolymer and the polyvinylidene fluoride to be blended, and prepares the polyvinylidene fluoride hollow fiber composite microporous membrane which has strong interfacial bonding force, hydrophilicity, pollution resistance, large flux, high interception rate and high mechanical strength by the solution phase transition method.

Provided are compositions comprising a superhydrophilic amphiphilic copolymer and a carrier and composition comprising a superhydrophilic amphiphilic copolymer, a micellar thickener and a carrier.

Particulate constructs stabilized by amphiphilic copolymers and comprising at least one active coupled to a hydrophobic moiety provide sustained release of the active in both in vitro and in vivo environments.

The invention discloses a hydrophilic polyvinylidene fluoride hollow fiber composite membrane and a preparation method. The aperture of the membrane is 0.01 to 0.1 micron; the porosity of the membrane is 60 to 80 percent; a polyvinylidene fluoride (PVDF) film is coated on the outer surface of a hollow woven fiber pipe; the thickness of the coating is 0.1 to 0.4 millimeter; the outer diameter of the membrane is 1.5 to 2.5 millimeters; and the PVDF film comprises the following components in percentage by mass: 80 to 95 percent of polyvinylidene fluoride, and 5 to 20 percent of amphiphilic copolymer, namely polyoxyethylene/polyoxypropylene/polyoxyethylene (PEO-PPO-PEO). The preparation method sequentially comprises the following steps of: preparing film casting solution, coating the hollow woven fiber pipe, forming a coagulating bath, cleaning, drying and the like. The hollow fiber composite membrane prepared by the method is stable and long-lasting in structure; the hydrophily of the membrane can be obviously improved; and the production cost is reduced and mass production is easy to realize by the method.

A liquid membrane matrix is disclosed in the form of an aquaporin containing bulk liquid membrane matrix (BLM), wherein said liquid membrane matrix is formed from a solution of an amphiphilic copolymer detergent wherein transmembrane proteins have been functionally incorporated and wherein said matrix further contains a stabilising oil phase. The uses of the membrane matrix include water extraction from liquid aqueous media by forward osmosis, e.g. for desalination of salt water.

This invention discloses a process for making nanopanticles of amphiphilic copolymers by flash precipitation. Nanoparticles may be of amphiphilic copolymer alone or may contain an additive target molecule, preferably an organic active. The inclusion of additive target molecules in amphiphilic copolymer nanoparticles can alter their water solubility characteristics, fluid dynamics, and/or stability. Changing an additive target molecule's solubility and stability in an nanoparticle can make a water insoluble compound suitable for pharmaceutical administration as well as specifically target the molecule to a specific area of a patient's body. The process affords the production of nanoparticles at high absolute active content, at high yield, high productivity, and high processing rates while using unusually low amounts of amphiphilic copolymers. Furthermore, the resulting particles exhibit sufficient stability for post processing as desired. The invention also discloses two apparatuses for the production of nanoparticles of amphiphilic copolymers by flash precipitation.

A responsive microgel is provided which responds volumetrically and reversibly to a change in one or more aqueous conditions selected from the group consisting of (temperature, pH, and ionic conditions) comprised of an ionizable network of covalently cross-linked homopolymeric ionizable monomers wherein the ionizable network is covalently attached to an amphiphilic copolymer to form a plurality of ‘dangling chains’ and wherein the ‘dangling chains’ of amphiphilic copolymer form immobile micelle-like aggregates in aqueous solution. A responsive microgel is further provided that comprises at least one therapeutic entity and delivers a substantially linear and sustained release of the therapeutic entity under physiological conditions.

The invention discloses an amphiphilic copolymer brush with pH responsiveness and a preparation method thereof. Particularly, the invention discloses an amphiphilic copolymer brush with pH responsiveness comprised of a block, which is formed by the copolymerization of a hydrophobic group and a pH response group, and a hydrophilic brush-shaped block. In the invention, a copolymer of a hydrophobic monomer and a pH response functional monomer is obtained by atom transfer radical polymerization (ATRP), then the copolymer is used as a macromolecular initiator to perform the ATRP polymerization of monomethoxypoly (ethylene glycol) methacrylate (PEGMA) which is a hydrophilic macromolecular monomer, and finally, a selective hydrolysis reaction is performed to prepare the amphiphilic copolymer brush with pH responsiveness. The preparation method of the invention has the advantages of simple process and high yield. The synthesized amphiphilic copolymer brush with pH responsiveness has a novel structure and an adjustable functional group proportion, and is suitable to be used in the transmission of entrapped insoluble medicaments.

The invention relates to a novel method for amphiphilic copolymer modified PVDF (Polyvinylidene Fluoride) hollow fiber ultra-filtration membranes, and belongs to the technical field of preparation of PVDF membranes. The method comprises the following steps: (1) PVDF, amphiphilic copolymer, pore-foaming agent, nonsolvent and solvent are fully mixed, and are dissolved to obtain membrane casting liquid; (2) the membrane casting liquid is fed in a hollow fiber membrane spinning machine for extruding, is condensed and formed in a coagulating bath, and is wound and collected to obtain the PVDF hollow fiber membranes; (3) the PVDF hollow fiber membranes are dipped in hot water; and (4) finished products are obtained after cleaning and drying. The amphiphilic copolymer modified PVDF hollow fiber ultra-filtration membranes, prepared by the method, have the characteristics of permanent hydrophilcity, excellent pollution resistance, high throughput and high reject rate.

The invention relates to a polyvinylidene fluoride membrane. The membrane casting liquid comprises the following components in percentage by weight: 10-25% of polyvinylidene fluoride resin, 1-4% of diatomite, 1-5% of amphiphilic copolymer, 4-12% of organic pore-forming agent, 0.2-3% of inorganic pore-forming agent, 0.1-3% of surfactant and the balance of solvent. According to the polyvinylidene fluoride membrane, the diatomite and the amphiphilic copolymer are added; by virtue of the diatomite, the mechanical strength and pure water flux of the membrane are improved; the amphiphilic copolymer and polyvinylidene fluoride have good compatibility; the combination force is strong; the copolymer is unlikely to run off and the continuous hydrophily of the membrane is guaranteed. The invention further relates to a preparation method of the polyvinylidene fluoride membrane. The preparation method comprises the following steps: (1) uniformly stirring the membrane casting liquid, standing and defoaming; (2) enabling the membrane casting liquid to vertically flow in the air by virtue of a spinning spinneret, so that the membrane casting liquid enters the coagulating bath and is cured and formed; (3) soaking the spun and formed polyvinylidene fluoride membrane in pure water and a glycerol water solution in sequence and drying so as to obtain the polyvinylidene fluoride membrane.

The invention discloses blank mixed micelle, and a preparation method and applications thereof. The blank mixed micelle comprises an amphiphilic copolymer and ginsenoside represented by formula I, ishigh in efficiency, is safe, is stable, is high in targeting performance, is excellent in homogeneity, is stable in quality, is convention in preparation technology, can be used for coating one or a plurality of active substances in drugs or cosmetics and health care substances, and is capable of forming mixed micelle containing loaded active substances. Compared with conventional nanometer micelle, the blank mixed micelle possesses following advantages: the mixed micelle loaded with active substances is excellent in drug forming performance, multiple drug resistance, stability, homogeneity, and safety performance, and is small in particle size; and the curative effect of loaded active drugs on drug resistant cells is better.

The present provides amphiphilic block copolymer coated surfaces (e.g., nanoparticles, medical devices, etc.) and methods of preparing such surfaces. In certain embodiments, the present invention provides amphiphilic block copolymer coated single dispersed nanoparticles, which are stable in buffer (e.g., PBS) and have neutral but functionable surfaces, and methods of preparing the same.

The invention discloses a method for modifying epoxy resin by using amphiphilic copolymer modified graphene. The method comprises the steps of preparing a graphene oxide from graphene serving as a raw material by adopting a Hummers oxidation method; polymerizing glycidyl methacrylate and vinylcarbazole by adopting a free radical polymerization method to obtain an amphiphilic polymer; dispersing the graphene oxide and the amphiphilic polymer into a solvent together, adding hydrazine hydrate, and reducing to obtain the amphiphilic copolymer modified graphene. The operation process is simple and convenient, and the amphiphilic copolymer modified graphene is easily synthesized in large batch. The prepared amphiphilic copolymer modified graphene has good dispersion performance in the epoxy resin, and can significantly improve the toughness of the epoxy resin. The mechanical properties of a graphene/epoxy resin composite material prepared by the method disclosed by the invention are greatly improved, wherein the tensile property is improved by over 30%, and the bending property is improved by over 50%.

The invention relates to a method for preparing a shell-sheddable polymer micelle drug carrier. The drug carrier is a disulfide bond bridging amphiphilic copolymer, and the disulfide bond can be rapidly cracked under reduction environment in cells to realize the intelligent drug release function through the shell shedding, so the amphiphilic copolymer can rapidly self-assemble into micelle nanoparticles and loading drugs in water. Compared with drug carriers prepared with the prior art, the shell-sheddable polymer micelle drug carrier allows the drug release rate under high concentration glutathione environment to be 3-5 times faster than the drug release rate under glutathione-free environment, can be used to control the release of drugs in tumor cells, and has obvious inhibition on the tumor cells, and the drug carrying micelle particles can stably clad anticancer drugs, so a novel high efficiency drug carrier system is provided for the tumor treatment.