485 results about "Vinyl pyridine" patented technology

The invention provides a solution to the above mentioned problem in that it provides a catheter balloon comprising a flexible coating on its outer surface wherein a plurality of microparticles are contained wherein said coating comprises a material selected from the group consisting of poly(N-vinyl-pirrolidone, poly(N-vinyl-pirrolidone-co-butylacrylate), poly(-vinyl pyridine), polyacrylamides, e.g. poly(N-isopropylacrylamide), poly(amido-amines), poly(ethylene imine), poly(ethylene oxide-block-propylene oxide), poly(ethylene oxide-block-propylene oxide-block-ethylene oxide), poly(styrene-block-isobutylene-block-styrene), poly(hydroxystyrene-block-isobutylene-block-hydroxystyrene), polydialkylsiloxanes, polysaccharides, polyacrylates and polyalkylmethacrylates, e.g. polymethylmethacrylate and poly(2-hydroxyethylmethacrylate) and wherein said microparticles comprise a material selected from the group consisting of polyesters, e.g. poly(lactic acid), poly(lactic-co-glycol acid), poly(glycolic acid), poly(3-hydroxybutyrate), poly(3-hydroxyvalerate), poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and polycaprolactone, polyamides, polysaccharides, polyurethanes, polyalkylmethacrylates and polyacrylates, e.g. polymethylmethacrylate and poly(2-hydroxyethylmethacrylate) and wherein the microparticles comprise a pharmaceutically active compound.

A process of preparing a nanocomposite comprised of an elastomer and at least partially exfoliated, intercalated water-swellable clay, comprising the steps of(A) forming a first blend of water-swelled clay and anionic polymer particle emulsion by blending:(1) an aqueous mixture comprised of water and a multilayered water-swellable clay, exclusive of an intercalant for said clay, wherein said water-swellable clay is comprised of a plurality of stacked platelets with water-expanded galleries between said platelets, wherein said galleries contain naturally occurring cationic ion exchangeable ions therein, and(2) an emulsion of anionic synthetic vinylpyridine-styrene-butadiene terpolymer (VPSBR) elastomer particles as an aqueous pre-formed elastomer emulsion having a pH in a range of from about 6 to about 11, comprised of anionic elastomer particles (elastomer particles having anions on the surface derived from an anionic surfactant) prepared by aqueous free radical induced polymerization of monomers in the presence of a free radical generating polymerization initiator and non-polymerizable anionic surfactant,wherein said synthetic elastomer particles are derived from an aqueous polymerization of said monomers comprising from about 0.1 to about 40 weight percent of styrene, from about 60 to about 100 weight percent of 1,3-butadiene, and from about 0.1 to about 8 percent by weight of vinylpyridine monomers which have the structural formula:wherein R1 represents a hydrogen atom or a straight chain or branched alkyl group containing 1 to 4 carbon atoms; and(B) blending with said first blend an aqueous mixture comprised of water and inorganic acid having a pH in a range of about 1 to about 4.

The invention provides modified pyridine styrene butadiene rubber latex and a preparation method and application thereof. The modified pyridine styrene butadiene rubber latex is prepared from raw materials, namely mixed monomers, an initiator, an emulsifying agent, a dispersing agent and water, wherein the dosage of the initiator is 0.2 to 0.6 percent of the weight of the mixed monomers; the dosage of the emulsifying agent is 1 to 2 percent of the weight of the mixed monomers; the dosage of the dispersing agent is 2 to 4 percent of the weight of the mixed monomers; the dosage of the water is 95 to 105 percent of the weight of the mixed monomers; the mixed monomers comprise the following components in percentage by weight: 20 to 80 percent of isoprene, 0 to 50 percent of butadiene, 10 to 30percent of styrene or acrylonitrile, and 2 to 9 percent of 2-vinylpyridine. The modified pyridine styrene butadiene rubber latex has high solid content and percent conversion of the rubber latex, uniform latex particles and low content of residual dialkene, is nontoxic and odorless, has simple, convenient and safe operations in production and use, has better chemical stability, heat resistance and cold resistance than the conventional pyridine styrene butadiene rubber latex, and has low production cost.

The invention discloses a preparation method of metal-nitrogen-doped porous carbon microspheres. According to the preparation method, a 4VP (4-vinyl pyridine) monomer is taken as a carbon and nitrogen source, different metal salts are taken as an initiator, a coordination agent, a catalyst and a template agent, firstly, the 4VP monomer is polymerized at the normal temperature by utilizing the metal salts as the initiating agent, a metal-coordination structure is formed by metal ions and nitrogen atoms in 4VP molecules, and metal-organic matter microspheres are formed; then metal in the microspheres has functions of the catalyst and the template agent at the high temperature, so that organic matter is converted into carbon, a spherical structure is reserved, and the metal-nitrogen-doped porous carbon microspheres are obtained after acid pickling. Selectivity of metal sources is high, steps are simple, and the prepared nitrogen-doped porous carbon material is large in specific surface area and high in nitrogen content. By means of large specific surface area and high nitrogen content, the material has huge application prospect in the fields of energy storage and conversion, catalysis and environment protection.

The invention relates to a preparation method for a hydrophilic dye-fixing agent for reactive dyeing. According to the method, vinylpyridine, amine monomers and acrylate monomers have a polymerization reaction when radical initiators and assisting initiators exist, and the hydrophilic dye-fixing agent is obtained. The hydrophilic dye-fixing agent prepared with the method has an excellent dye-fixing effect, meanwhile, the hygroscopicity and the hydrophilia of cotton fabric are not affected, and a good hand feeling is achieved.

The invention provides a copper nanofluid solar cooling liquid and a preparation method thereof, and belongs to the field of synthesis technologies of inorganic materials. The copper nanofluid solar cooling liquid comprises deionized water, glycol and propylene glycol, nano-copper powder, vinylpyridine, azodiisobutyronitrile, acylamino compound, phosphates and benzotriazole. The preparation method comprises the following steps of: uniformly dispersing the nano-copper powder into alcoholic solution by rapid dispersing; polymerizing on the nanometer copper surface to obtain a monomolecular film; adding a dispersing agent; mixing the obtained alcoholic solution with phosphate aqueous solution; dispersing and mixing at a medium speed again; dispersing by an ultrasonic oscillating instrument; and then homogenizing through a fold-type reducer pipe, so as to obtain the copper nanofluid solar cooling liquid. The prepared copper nanofluid has the characteristics that the thermal conductivity is four times higher than that of the deionized water, the uniformity in dispersing is realized, the stability is excellent, the stability is remained after placing for 2400 hours at the normal state, the freezing point is low, no icing occurs at the temperature of -40 DEG C, the corrosion resistance is excellent, and the copper nanofluid is suitable for an anti-freezing liquid, and the material source is rich; the raw materials are directly sourced, low in price and easy to obtain; low requirement is brought to the running of the equipment; and the massive industrial production can be easily realized.

The invention discloses a preparation method of a loofah sponge surface lead ion imprinted absorbing material and the use of the loofah sponge surface lead ion imprinted absorbing material in metal ion absorption and belongs to natural high polymer material modification. In the method, the loofah sponge natural high polymer material is used as a support, and the surface of the material is modified with a lead ion imprinted polymer. The main technical characteristics of the method include: adding acylated loofah sponge, lead-dithizone complex, 4-vinylpyridine, ethylene dimethacrylate and azodiisobutyronitrile into a chloroform medium, removing oxygen by argon in a certain proportion; introducing argon to expel oxygen; reacting in a water bath at a constant temperature of 50 to 70 DEG C, filtering and washing; and performing Soxhlet extraction by using 0.10mol / L solution of HNO3 for 12 hours, removing template lead ions, washing, drying and obtaining the material. The material has specific lead ion identification capacity, high selectivity, high absorption speed and high desorption capacity, is widely available and biodegradable, can be prepared by a simple process and has regeneration capacity and the advantages of environmental friendliness and the like.

Provided is a polyhedral oligomeric silasesquioxane (POSS)-based load metal nanoparticle and a preparation method thereof. A reversible addition fragmentation free radical polymerization (RAFT) method is utilized to compound propyl methyl acryloyl oxygen isobutyl POSS monomers, chain transfer agent and initiator into solution according to dosages. Liquid nitrogen is utilized to achieve freeze thawing and degassing, and then argon is filled to protect reaction. PMAiBuPOSS is obtained. The PMAiBuPOSS, 4-vinyl pyridine (4VP) monomers and the initiator are compounded into the solution. Through the RAFT method, POSS-based amphiphilic block copolymers, namely, PMAiBuPOSS-b-P4VP, are polymerized. The POSS-based amphiphilic block copolymers are dissolved in volatility co-solvent, and then selective solvent is added to enable the POSS-based amphiphilic block copolymers to form the nanoparticle dissolved in the solution in a self-assembly mode. A certain dosage of chloroauric acid (HAuCl4) is further added dropwise. Finally, the POSS-based load metal nanoparticle is obtained after in-situ reduction.