755 results about "Polymer dissolution" patented technology

The present invention relates to processes utilizing ionic liquids for the dissolution of various polymers and/or copolymers, the formation of resins and blends, and the reconstitution of polymer and/or copolymer solutions, and the dissolution and blending of “functional additives” and/or various polymers and/or copolymers to form advanced composite materials.

The invention relates to a process for the production of morphologically uniform microcapsules that contain peptides, proteins or other water-soluble biologically active substances as active ingredients as well as microcapsules that are produced according to this process with a degree of concentration of between 3 to 30% by weight and a diameter<=8 mum.According to the invention, biodegradable polymers are dissolved in a halogen-free solvent or solvent mixture, and the buffered active ingredient solution, which has a pH of between 6.0 to 8.0, is dispersed into this solution. Then, an aqueous solution that contains a surface-active substance (W/O/W-emulsion) is added to this W/O-emulsion, and the solvent is removed.The microcapsules that are produced with this process do not show any tendency toward agglomeration. The encapsulation efficiency of the process is approximately 90 to 95%.

A process for producing an epoxidized diene polymer includes: dispersing or suspending a diene polymer (C) having a ball-reduced particle size of 0.05-20 mm in a medium (A) in the presence of powder particles (B) insoluble in the medium (A), or in an aqueous medium in the presence of a phenol-based stabilizer and/or a phosphorus-based stabilizer; and epoxidizing the diene polymer (C) by an epoxidizing agent, therefore, problems associated with epoxidation performed by dissolving diene polymer in a solvent are eliminated; an economical method for epoxidizing, producing, and purifying a diene polymer (C) in a solid form is provided; and the epoxidized diene polymer having an excellent heat stability can be obtained.

A polymer blend is prepared by dissolving chitosan and a second polymer in an acidic aqueous solution to form an aqueous polymer blend, dehydrating said aqueous polymer blend, and recovering said polymer blend. The second polymer may be selected from the group consisting of polyether glycols including polyethylene glycols; cellulose esters including cellulose acetate; poloxamers; polysaccharides including dextran and guar; polyvinylpyrrolidones; polyvinyl alcohols; and mixtures or copolymers thereof. These polymer blends swell in an acidic environment and deswell in a more neutral or basic environment. This technology is valuable for the dispensing of biologically active material or drugs into a surrounding environment, especially the environment as is found in the gastrointestinal tract. Since the various polymer blends of the present invention are not covalently or ionically crosslinked, but are physically combined, each polymer in the physical blend maintains its original chemical structure, and therefore, is safe for oral administration.

The invention discloses a lithium ion battery ionic liquid based gel polymer electrolyte as well as a preparation method and applications thereof. The method comprises the following steps: dissolving a polymer into an organic solvent; then adding deionized water and an inorganic ceramic material, thus obtaining a gel liquid; soaking an non-activated supporting body in the gel liquid; taking out and airing, thus a heat-resistant contracted lithium ion battery polymer diaphragm doped with the inorganic ceramic materials is obtained; dissolving lithium salt in an ion liquid, and adding a film formation addition agent, thus an ion liquid based electrolyte capable of gelating the polymer diaphragm is obtained; and soaking the dried heat-resistant contracted lithium ion battery polymer diaphragm doped with the inorganic ceramic material in the ion liquid based electrolyte, thus the heat-resistant contracted lithium ion battery ionic liquid based gel polymer electrolyte doped with the inorganic ceramic material is obtained. The preparation method is simple, and the safety performance, mechanical intensity and electromechanical performance of the lithium ion battery ionic liquid based gel polymer electrolyte are improved.

Methods for devolatilizing polymer solutions have been invented which include, in certain aspects, dissolving a viscous polymer in a solvent forming a polymer-solvent solution, introducing the polymer-solvent solution into a thermal dryer, heating or cooling the polymer-solvent solution in the thermal dryer forming product polymer with solvent removed and separated solvent (which may include other residuals), the separated solvent with other residuals if present vaporizing in the thermal dryer forming a vapor, removing the vapor from the thermal dryer, and discharging product polymer from the thermal dryer.

Microfilament-generating multicomponent fibers are provided that include a first polymer component and a second polymer component extruded together in separate contiguous polymer segments extending along the length of the fiber. The first polymer component comprises a synthetic melt-processable polymer that is substantially soluble in a first relatively benign solvent selected from water, aqueous caustic solution, and non-halogenated organic solvents. The second polymer component is formed from a second synthetic melt-processable polymer dimensioned to produce one or more microfilaments upon dissolution of the first polymer, and that is substantially soluble in an aqueous solvent selected from water and aqueous caustic solution. The two polymer components are dissolvable in different solvents.

A new, non-wrapping approach to solubilize nanotubes, such as carbon nanotubes, in organic and inorganic solvents is provided. In accordance with certain embodiments, carbon nanotube surfaces are functionalized in a non-wrapping fashion by functional conjugated polymers that include functional groups for solubilizing such nanotubes. Various embodiments provide polymers that noncovalently bond with carbon nanotubes in a non-wrapping fashion. For example, various embodiments of polymers are provided that comprise a relatively rigid backbone that is suitable for noncovalently bonding with a carbon nanotube substantially along the nanotube's length, as opposed to about its diameter. In preferred polymers, the major interaction between the polymer backbone and the nanotube surface is parallel π-stacking. The polymers further comprise at least one functional extension from the backbone that are any of various desired functional groups that are suitable for solubilizing a carbon nanotube.

Methods for making microporous polyvinylidene fluoride (PVDF) membranes from vinylidene fluoride polymers and the products produced. The PVDF microporous membranes have a significantly faster flow rate at a given pore size as compared to equally-sized microporous membranes made by conventional procedures. The PVDF microporous membranes also have significantly smaller pore sizes than conventional microporous PVDF membranes. The present membranes have unique macrostructural features responsible, in part, for their unique functional properties. The process includes dissolving the polymer in a liquid that includes a solvent and a co-solvent for the polymer. The dissolution of the polymer can be at temperatures ranging from about 20 DEG C. to about 50 DEG C. while the formation of the microporous membrane can be at temperatures ranging from about -10 DEG C. to 50 DEG C. Selection of appropriate operating parameters of temperature and solvent/co-solvent concentration can optimize the membrane at a given nominal pore size, flow rate, and polymer distribution.

The invention discloses a preparation method of conductive high-strength graphene-reinforced polymer fiber, which comprises the following steps of: (1) dissolving a graphene oxide raw material in solvent, and carrying out ultrasonic treatment to obtain graphene oxide dispersion; (2) dissolving a polymer in solvent to obtain a polymer solution; and (3) adding the graphene oxide dispersion obtained in the step (1) to the polymer solution obtained in the step (2) under stirring, continuing stirring after complete addition, adding a reducing agent, centrifuging or carrying out rotary evaporation treatment, concentrating, transferring to a spinning device, continuously extruding from a spinning head at uniform speed, forming after entering a solidifying solution, and collecting to a roller to obtain continuous graphene-reinforced polymer fiber. The preparation method is simple and convenient, low in cost and multiple in used polymer variety, and is suitable for large-scale industrialized production; and the produced fiber has excellent mechanical property and better conductivity, and can be used for power transmission, antistatic textile, engineering material engineering material and other fields.

A quantum-sized material and a method for producing such a material according to a predetermined nano-porous polymer template. The method includes the steps of: (a) preparing a nano-porous polymer template, wherein the preparation step includes the sub-steps of (i) dissolving a polymer in a volatile solvent to form an evaporative solution, (ii) depositing a thin film of this solution onto a substrate, and (iii) directing a moisture-containing gas to flow over the spread-up solution film while allowing the solvent in the solution to evaporate for forming a template, which is constituted of an ordered array of nanometer-scaled air bubbles with polymeric walls dispersed in a polymer film; (b) filling the air bubbles with a precursor fluid; and (c) converting the precursor fluid in such bubbles to obtain a quantum-sized material in the form of an array of dots supported in the template. At least one of the dot dimensions is on the 100 nm scale or smaller, preferably smaller than 20 nm.

The invention provides a preparation method of anion-exchange membranes based on ionic liquid, which relates to an ion exchange membrane. The invention provides an anion-exchange membrane based on ionic liquid with the advantages of environment-friendly effect, high electric conductivity, good chemical stability, good thermostability and good mechanical performance and a preparation method thereof. The free radical copolymerization reaction is carried out for preparing imidazolium type polymers according to the following steps: adding imidazole type ionic liquid monomers, acrylic ester monomers, solvents and triggering agents into a reaction vessel for carrying out back flowing reaction under the protection of inert gas; carrying out precipitation, washing and drying on obtained products to obtain the imidazolium type polymers. The membrane forming is carried out according to the following steps: dissolving the imidazolium type polymers obtained in the first step into organic solvents to be prepared into polymer solution, forming the membranes through a phase conversation method, and obtaining the anion-exchange membranes based on the ionic liquid.

Disclosed herein is a method for producing a sheet including a silica aerogel, the method including (S1) gelling a water glass solution in a mixture of an alcohol and water to prepare a wet gel, (S2) hydrophobically modifying the surface of the wet gel with a non-polar organic solvent, an organosilane compound and an alcohol, (S3) dissolving the hydrophobically modified silica gel and a polymer in an aprotic organic solvent to prepare an electrospinning solution, and (S4) electrospinning the electrospinning solution to produce a fiber web including a silica aerogel, and a sheet in which a polymer and a silica aerogel coexist in the form of a fiber.

The invention discloses a preparation method for a polymer-grafted graphene laminated fiber with electrical conductivity and high-strength. The preparation method comprises steps as follows: (1) dissolving graphene oxide raw materials into a solvent, and ultrasonically processing to obtain graphene oxide dispersing liquid; 2) dissolving the polymer into the solvent to obtain the polymer solution; 3) slowly adding the graphene oxide dispersing liquid into the polymer solution, and adding a reducing agent to reduce the graphene oxide into graphene; and 4) centrifugally processing to wash away free polymer to obtain polymer-grafted graphene sol, transferring the polymer-grafted graphene sol into a spinning device, continuously extruding the polymer-grafted graphene sol from a spinning head at a constant speed, forming in solidifying liquid, and then collecting the formed polymer-grafted graphene sol on a roller shaft, so as to obtain the continuous polymer-grafted graphene laminated fiber. The preparation method is simple and convenient, low in cost, rich in variety of used polymers, and suitable for massive industrial production; the produced fiber is excellent in mechanical performance, and higher in conductivity; and the produced fiber can be applied to fields of power transmission, anti-static textile, engineering material, etc.

The invention discloses a slow release fertilizer applicable to water-fertilizer integration. The slow release fertilizer is a nano capsule slow release fertilizer prepared from nutritional ingredients as core materials and a slow soluble film-forming polymer as a capsule wall material. The slow release fertilizer can be evenly dispersed into the water to form a colloidal solution and achieves the slow release and controlled release targets. The invention further provides a preparation method of the slow release fertilizer. The method comprises the following steps: dissolving the slow soluble film-forming polymer into an organic solvent which is not mixed and dissolved with the water; dispersing a core material water solution into the organic solvent to form a water-in-oil W/O emulsion; and adding the W/O emulsion to the water solution containing protective colloid to disperse, so as to form a W/O/W emulsion, and then evaporating a solvent, so as to form the nano capsule. The slow release fertilizer can be evenly dispersed into water to form the colloidal solution, and can be irrigated together with water; and the capsule wall material is a slow soluble film-forming polymer, and can be slowly dissolved into soil to achieve the controlled release target, secondary pollution to the soil is not generated, and the slow release fertilizer has market function value.

The invention relates to the technical field of residual sludge treatment, in particular to a process method for conditioning and dehydrating residual sludge. The method particularly comprises the following steps: (1) adding acid into the residual sludge to be treated and with the water content of 90 to 95 percent and adjusting until the pH value is between 4.0 and 6.0; (2) adding quaternary ammonium salt cationic organic matters into the conditioned sludge in the step (1) and performing hybrid reaction; (3) adding a dehydration aid into the conditioned sludge in the step (2) and stirring uniformly; and (4) adding coagulant into the conditioned sludge in the step (3) and mechanically dehydrating after mixing and stirring. The extracellular polymers on sludge flocs are stripped and partially hydrolyzed by a chemical conditioning mode, microbial cells are dissolved, a large amount of bound water is released, and the water permeability of the sludge is improved by utilizing the aid, so that the dehydration performance of the sludge is integrally improved, the water content of the sludge is reduced, the dehydration time is shortened and the dehydration cost is reduced.

A radiation sensitive resin composition which comprises (A) a polymer which becomes alkali-soluble in the presence of an acid and (B) a radiation sensitive acid generator which generates an acid upon irradiation with a radiation, said polymer (A) comprising two recurring units represented by the general formulas (1) and (2) and a recurring unit which acts to reduce the solubility of the polymer is an alkali developer after the irradiation:wherein R1 represents a hydrogen atom or a methyl group and R2 represents a hydrogen atom or a methyl group. Said composition provides a chemically amplified positive resist which can give a fine pattern with a good pattern shape, and said resist is freed from volume shrinkage, peeling failure and adhesive failure, is excellent in dry etching resistance and effectively reacts with various radiations to give a good pattern shape which is excellent in photolithographic process stability, said pattern shape having no thinned portion at the upper part.

A waterproof membrane is described that includes a barrier layer and a functional layer. The functional layer can include a thermoplastic polymer that changes consistency under the influence of highly alkaline media, and an adhesive. The production and use of the membrane are also described. The functional layer of the membrane can be designed in the form of a film, a coating, or a nonwoven fabric. The fibers in the fabric can include a hard core that is surrounded by a polymer layer, is inert prior to coming into contact with liquid concrete and acts as a protective layer. Thus, the membrane is protected from premature aging and allows work to be performed with the seal in place. During the concreting process, i.e. when the functional layer comes into contact with liquid concrete, the polymer dissolves and thus allows the adhesive to bond to the concrete. The functional layer thus acts as an adhesive sealing compound and the seal is leakproof.

The present invention provides a method for manufacturing a separator, comprising the steps of (S1) preparing a porous planar substrate having multiple pores; (S2) coating a coating solution obtained by dissolving a binder polymer in a solvent and dispersing inoganic particles therein on the porous substrate to form a porous coating layer and drying the porous coating layer; and (S3) applying a binder solution on the surface of the dried porous coating layer to form an adhesive layer, wherein the binder solution has a surface energy of at least 10 mN/m higher than that of the porous coating layer and a contact angle of the binder solution to the surface of the porous coating layer maintained at 80° or more for 30 seconds. In accordance with the present invention, a separator capable of obtaining sufficient adhesion force with minimizing the amount of an adhesive used for the adhesion with an electrode, and minimizing the deterioration of battery performances can be easily manufactured.