37results about How to "Wide molecular weight range" patented technology

The present invention is directed to nonwoven webs and articles comprising nanofibers. The nanofibers are made from a polymer having a glass transition temperature about 25 C. The nanofibers, having a diameter of less than 1 micron, may comprise a significant number of the fibers in one layer of the web contained by the article. Preferably, the nanofibers are produced in a melt film fibrillation process. Articles include diapers, training pants, adult incontinence pads, catamenials products such as feminine care pads and pantiliners, tampons, personal cleansing articles, personal care articles, and personal care wipes including baby wipes, facial wipes, and feminine wipes.

The present invention is directed to articles comprising nanofibers. The nanofibers, having a diameter of less than 1 micron, may comprise a significant number of the fibers in one layer of the web contained by the article. Preferably, the nanofibers are produced in a melt film fibrillation process. The articles include diapers, training pants, adult incontinence pads, catamenials products such as feminine care pads and pantiliners, tampons, personal cleansing articles, personal care articles, and personal care wipes including baby wipes, facial wipes, and feminine wipes.

A novel method for building complex three-dimensional scaffolds for biomimetic applications such as in vitro organ growth, using a gelatin / sugar / water gel, ultraviolet radiation, and heat or enzyme is described. The method produces gelatin-sugar hydrogels demonstrating greater thermal stability, mechanical strength, and resistance to enzymatic degradation. The invention also provides a means to assemble the gelatin sugar hydrogel films into complex three-dimensional structures (scaffolds). To account for the native biochemical factors present in natural scaffolds, methods of conjugating such factors to the gelatin-sugar hydrogel are described. These scaffolds can then be applied for tissue culturing and organ growth. The present invention also describes a system and apparatus for constructing these complex three-dimensional scaffolds by taking advantage of the physical and chemical properties of the gelatin-sugar hydrogel.

The invention discloses a continuous synthesis method of polyether. The continuous synthesis method comprises the following steps: adding low molecular weight polyether into a reaction kettle, adding a DMC (Dimethyl Carbonate) catalyst, ventilating an alkyleneoxide compound after nitrogen gas displacement, and carrying out induced reaction, wherein the DMC catalyst is indicated to be induced when pressure is obviously lowered and temperature is quickly increased; and then, with small molecule alcohol as an initiator, continuously adding the alkyleneoxide compound into the reaction kettle after mixing with the initiator, and continuously adding the DMC catalyst by an external circulating pipeline to continuously synthesize out the polyether product. According to the continuous synthesis method disclosed by the invention, the applied initiator is low in price, and the obtained polyether product is wide in molecular weight range, high in construction ratio and narrow in molecular weight distribution..

The present invention provides a process for producing an N-vinylamide polymer in an efficient manner by an aqueous solution polymerization method in which a gel-like polymer having an excellent handling property can be produced, and a polymerization time can be shortened. The process for producing an N-vinylamide polymer by subjecting a monomer component comprising N-vinylamide to aqueous solution polymerization according to the present invention comprises the step of polymerizing the monomer component comprising N-vinylamide in the presence of an inorganic salt, which inorganic salt is present in an amount of not less than 7% by mass based on water in a uniform aqueous solution comprising the monomer component at a concentration not more than a saturated solution concentration thereof as measured at a polymerization initiation temperature.

The invention discloses a Polygonatum sibiricum polysaccharide column chromatography separation method and extraction method. The Polygonatum sibiricum polysaccharide column chromatography separation method comprises the following step: carrying out column chromatography separation on Polygonatum sibiricum polysaccharides with a macroporous adsorbent resin, wherein the sample loading quantity is 10ml per 100-200ml column volume, the concentration of the Polygonatum sibiricum polysaccharides in the loaded liquor is 3.5-4.5mg / ml; the eluting agent is a 10-50 wt% ethanol water solution, the consumption of the eluting agent is 80-150ml per 100-200ml column volume, and the eluting flow rate is 1-2ml / minute. The Polygonatum sibiricum polysaccharide column chromatography separation method and extraction method are simple to operate, and have the advantages of favorable repetitiveness and high product purity; the separated Polygonatum sibiricum polysaccharides are varied and not limited to oligosaccharides; and thus, the Polygonatum sibiricum polysaccharide column chromatography separation method and extraction method are more suitable for industrial production.

The invention discloses a block copolymer toughening agent and its preparation method and application. The invention adopts an emulsion polymerization system and uses a reversible addition-fragmentation chain transfer radical polymerization technology to prepare poly( Methacrylic acid-b-methyl methacrylate-b-n-butyl acrylate) block copolymer toughener. The block copolymer toughening agent is blended with polycarbonate to prepare an alloy. The process equipment of the invention is simple, the process is environment-friendly, energy-saving and easy to operate. The preparation of block copolymer toughening agent adopts amphiphilic macromolecule reversible addition fragmentation chain transfer agent, which has dual functions of chain transfer agent and emulsifier, which not only realizes good control of monomer polymerization, but also avoids the traditional emulsification The use of the agent; the reaction has no hindered polymerization period, the reaction speed is fast and the final conversion rate is high, the growth of the colloidal particles is stable during the process, and the product molecular weight range is wide.

The invention discloses a method for preparing a heat-crosslinkable polymer electrolyte membrane. In the method, a styrene / isoprene / methyl acrylate block copolymer is dissolved in a volatile organic solvent, dried to form a film, and then The film is immersed in an electrolyte solution containing a thermal initiator to obtain a thermally crosslinkable polymer electrolyte membrane. The invention adopts an emulsion polymerization system and utilizes a reversible addition-fragmentation chain transfer radical polymerization technology to prepare a styrene / isoprene / methyl acrylate block copolymer, which has a wide molecular weight range of the polymer and a wide monomer composition range. The heat-crosslinkable polymer electrolyte membrane can reach a discharge specific capacity of 154mAh / g in a lithium iron phosphate half-cell, and has great application value.

The invention provides a petroleum sulfonic acid sodium salt composition, a preparation method and application thereof. The preparation method comprises taking the total weight of the mixture as 100%, 5wt%-95wt% fraction 1 with an average molecular weight of 252-312, 5wt%-95wt% fraction 2 with an average molecular weight of 313-395 and 0-50wt% % average molecular weight is that fraction 3 of 396-490 is mixed homogeneously, obtains mixture; Add diluent in mixture, obtain the product after dilution, adopt SO 3 The gas is subjected to sulfonation treatment on the diluted product to obtain a product after sulfonation treatment; wherein, the diluent includes one or a combination of alcohols with a carbon chain length of C3-C10, and the amount is the weight of the mixture 0.1%-10% of 0.1%-10%; and then use sodium hydroxide aqueous solution to neutralize the petroleum sulfonic acid in the product after sulfonation treatment until the pH value of the system is 7-10 to obtain the petroleum sulfonic acid sodium salt composition.

The invention discloses a carbon fiber modified by a crystalline crosslinkable polyaryletherketone sizing agent and a preparation method thereof, belonging to the technical field of carbon fiber surface treatment. The present invention utilizes difluoro monomers containing aniline side groups and bisphenol monomers to polymerize, or to modify crystalline polyaryletherketones to obtain soluble amorphous polyaryletherketone polymers, and then heat-induced crosslinking The group is capped at both ends of the polymer; at the same time, the surface of the carbon fiber is electrochemically reduced, and the same cross-linking group as mentioned above is grafted to the surface of the carbon fiber; then the carbon fiber whose surface has been treated by electrochemical reduction is drawn through the sizing agent The solution is sized and acidified to restore the crystallinity of the polyaryletherketone sizing agent; finally, after the carbon fiber is processed and formed to prepare the composite material, a high-temperature heat treatment is carried out to initiate the crosslinking reaction, and to improve the crystallization degree of the polyaryletherketone polymer, so that the sizing The agent has a crystalline structure, and at the same time forms a chemical bond connection with the surface of the carbon fiber, improves the interfacial shear strength, and is resistant to high temperature and corrosion.

The invention discloses a method for preparing a thermal conduction enhanced phase change energy storage wood based on photothermal response. The method mainly comprises the following steps: (1) carboxylating graphene oxide to obtain carboxylated graphene oxide, performing conjugate grafting on the carboxylated graphene oxide by using ammoniated multi-arm polyethylene glycol, controlling the amount of polyethylene glycol grafted on the surface of graphene, and blending the polyethylene glycol-grafted graphene with polyethylene glycol to prepare a phase change energy storage material; and (2) preprocessing wood with a low-concentration sodium hydroxide and sodium sulfite solution, preparing a solution by using maleic anhydride as esterification agent and acetone as a solvent, impregnating the preprocessed wood in the solution, allowing the above obtained graphene / polyethylene glycol phase change energy storage suspension to infiltrate the wood by a vacuum pressurizing full-cell process,and regulating a multidimensional interpenetrating network structure to obtain the thermal conduction enhanced phase change energy storage wood. A firm amide bond can be formed between graphene and polyethylene glycol to ensure the stability of the phase change system.

The invention discloses a water-based electrode bonding agent for a sulfur positive pole and a preparing method. The water-based electrode bonding agent for the sulfur positive pole is butyl acrylate / styrene segmented copolymer rubber latex, the structure expression formula is R-AAn1-b-Stn2-b-BAn3-b-Stn4-b-BAn5-b-Stn6-X, the segmented copolymer is stably dispersed in water in a particle mode to form the rubber latex, and the average diameter of particles is about 98 nm to 147 nm. The water-based bonding agent prepared with the method applied to the sulfur positive pole has the advantages of being high in specific capacity and good in cycle performance, the specific discharging capacity can be 935.7 mAh / g after the water-based electrode bonding agent is cycled 50 times at 0.2 C multiplying power, the bonding agent is good in preparing controllability, the preparing technology is simple, the process is environmentally friendly, energy is saved, and raw materials are low in cost and easy to obtain.

A method of extracting kiwi fruit proteinase is disclosed. The invention employs 0.1-0.5% green tea polyphenols solution as precipitator, the volume ratio of green tea polyphenols solution with kiwi fruit juice is 0.8-1.1:1. Compared with the prior arts, the invention has merit of high yield, simple process, short period, low cost, innocuity etc, which is suitable for industrialized production of kiwi fruit proteinase.