11 results about "Hydrogen bond" patented technology

The invention belongs to the technical field of intelligent high-molecular materials, and relates to a preparation method and an application of a high-strength oriented polyvinyl alcohol hydrogel. Thepreparation method of the high-strength oriented polyvinyl alcohol hydrogel comprises the following steps: adding deionized water to dissolve polyvinyl alcohol powder, carrying out freeze-thawing circulation, pre-stretching orientation and freeze drying to obtain a polyvinyl alcohol aerogel, and immersing the obtained polyvinyl alcohol aerogel in an aqueous solution of a salt having a Hofmann effect or an aqueous solution of a salt capable of forming a coordinate bond or an aqueous solution of a polycarboxy compound capable of forming a hydrogen bond with polyvinyl alcohol to prepare the high-strength oriented polyvinyl alcohol hydrogel. The high-strength oriented polyvinyl alcohol hydrogel has a tensile strength reaching up to 41.0 MPa, an elongation at break reaching up to 228.0% and atoughness reaching up to 49.94 MJ/m<3>, also has antibacterial and anticorrosive effects and a free radical scavenging effect, and is of great significance to broaden the application of the polyvinylalcohol hydrogel in artificial muscles and cartilages, tissue engineering and other biomedical materials.

The invention relates to a high-strength and high-modulus polyvinyl alcohol fiber and a melt spinning method of the high-strength and high-modulus polyvinyl alcohol fiber. The method comprises the following steps that polyvinyl alcohol, water and polyatomic alcohol are subjected to full swelling after being uniformly mixed; the polyvinyl alcohol subjected to the full swelling is added into a double-screw-rod extruding machine and is then subjected to full fusion to be extruded, and melt fine flows form a primary fiber after air blowing cooling; and the prepared primary fiber is subjected to the drying by a hot air drying oven, multistage stretching and tense heat setting to form the polyvinyl alcohol fiber. The preparation method of the prepared polyvinyl alcohol fiber has the advantage that through the hydrogen bond compounding among water molecules, polyatomic alcohol and polyvinyl alcohol molecules, the melt spinning and the high-power stretching of the polyvinyl alcohol are realized. The polyvinyl alcohol fiber prepared by the preparation method has the advantages of fiber degree controllability, high strength and high modulus, and can be widely applied to the field of civil engineering concrete.

The present invention relates to a process for the manufacture of structural hybrid thermoplastic composites where organic and inorganic fibres are well dispersed in a thermoplastic matrix. The process comprises defibrillating the organic fibres with or without the presence of surface active agents using a mixer at a high shear and at a temperature lower than the decomposition temperature of organic fibres and melting point of the surface active agents to separate the hydrogen bonded fibres and generate microfibres, followed by blending and dispersion of the organic fibres in the thermoplastic matrix to produce a fibre composite, followed by further blending and dispersion of the fibre composite with inorganic fibres at a low shear to get the moldable hybrid composite, followed by extrusion, injection or compression-injection molding. Low shear mixing maintains the inorganic fibre length. The process produces high performance composite materials having excellent performance properties and are ideally suited for automotive, aerospace, furniture, sports articles, upholstery and other structural and semi-structural applications.

The invention discloses polymer functional graphene and a preparation method and application thereof. Graphene is connected with a polymer through the combination of at least one of imide, amide, ester groups and amidogen, wherein the polymer is a polymer at least containing one benzene ring and with the molecular weight of 200-500,000 and interacts with the graphene through covalent bonds, hydrogen bonds and/or pi-pi conjugation. The polymer functional graphene is excellent in dispersion property in non-polar solvents and excellent in dispersion stability, and cannot precipitate after long-time storage for multiple months; according to the adopted preparation method, the polymer with amidogen, hydroxyl and carboxyl reacts with epoxy, hydroxyl and the like on the graphene and then is subjected to covalent grafting on the surface of the graphene, and the grafting rate of the polymer reaches 30% or above. In addition, the obtained polymer functional graphene can be widely applied to lubricating oil, plastic, rubber, paints, adhesives, fibers and other fields, and has potential application value.

The invention discloses a thermoplastic starch-polyvinyl alcohol composite plastic film, and relates to the technical field of film production. The composite plastic film is made by using the following raw materials, by mass, 80-100 parts of (self-made) thermoplastic starch, 40-55 parts of polyvinyl alcohol, 10-15 parts of acrylic acid, 5-10 parts of benzoyl peroxide, 7-12 parts of oxidized polyethylene wax, 4-8 parts of hydroxyethyl cellulose, 5-12 parts of calcium stearate, 5-15 parts of iron oxide, 3-6 parts of gelatin, 5-10 parts of urea, and 8-15 parts of polyethylene glycol. The composite plastic film made in the invention reserves the good biodegradation performance of starch and effectively improves the mechanical performances of a plastic film, and a covalent bond introduced due to the addition of a cross-linking agent can substitute a hydrogen bond in order to improve the mutual crosslinking among starch, polyvinyl alcohol and other raw material molecules.

The invention provides a method for extracting saponin active ingredients from bark of acacia mearnsii de willd based on deep eutectic solvents (DESs), belonging to the technical field of plant extraction. The method comprises the following steps of (1) mixing an aqueous solution of the deep eutectic solvent with bark powder of acacia mearnsii de willd according to a liquid to material ratio of (5to 20 mL): 1 g to obtain mixed material liquid; (2) placing the mixed material liquid in step (1) at 35 to 65 DEG C for sufficiently dissolving for 20 to 60 minutes, then performing solid-liquid separation and collecting a supernatant component, the saponin active ingredients; the deep eutectic solvent is an eutectic mixture of a hydrogen bond acceptor and a hydrogen bond donor; the hydrogen bondacceptor is choline chloride; the hydrogen bond donor is one or more of citric acid, glucose and glycerol. The saponin active ingredient extracted by the method has the highest yield which is 50% orhigher than that of a traditional organic solvent extraction method, is 30% or higher than that of an ultrasonic extraction method, and is a low-temperature, low-energy-consumption, green and efficient extraction method.

The invention relates to a synthetic method of methylene ether urushiol hydroxamic acid derivatives with (histone deacetylase) HDAC inhibitory activity. Unsaturated urushiol is taken as a raw material, and oxidative polymerization of the urushiol is blocked through an etherification reaction; hydroxamic acid groups are introduced to tail parts of side chains of the urushiol thorugh a Diels-Alder reaction, a hydrolysis reactions, a hydroxylation reaction and the like; and in addition, different pharmacological groups such as nitro groups, hydroxyl groups and the like are introduced into benzene rings or alkyl chains, so that three methylene ether urushiol hydroxamic acid derivatives are synthesized. The three compounds can be well combined with active pockets of HDAC, can form stable hydrogen bonds with residual groups of the HDAC for interaction, and can be stably chelated with Zn<2+> at the bottom of the active pockets, so that good HDAC inhibitory activity is achieved. The median inhibitory concentrations (IC50) of the three compounds on HDAC 2 and HDAC 8 are equivalent to the IC50 value of an HDAC inhibitor SAHA approved by the Food and Drug Administration (FDA). The three compounds can be applied to clinical antitumor drugs and have extremely high additional values, and the synthetic method can be a novel technology for clinically developing novel phenol-based HDAC inhibitors.

The invention discloses a method for preparing silicon and titanium composite powder, and belongs to the technical field of composite powder. The method has the advantages that stroke deposition and coating are carried out on silicon and titanium particles by means of wet organic surface modification, silicon titanium oxide bond formation can be ultimately increased by means of calcination, accordingly, the quantity of hydrogen bonds can be reduced, the stability can be improved, the specific surface area of titanium can be increased, and the chromaticity can be improved.

The invention discloses a polynitrogen heterocyclic super molecule sensitizer and an application thereof, wherein the sensitizer uses a polynitrogen heterocyclic derivative as an electron donor of thesensitizer, the polynitrogen heterocyclic super molecule sensitizer is formed by an intermolecular hydrogen bond between-N= group and a carboxylic acid small molecule, the structural formula is as shown in the specification, wherein ''suspension points'' represent the intermolecular hydrogen bond. The polynitrogen heterocyclic super molecule sensitizer has simple molecular assembly and strong stereostructure, and can be used for preparing a solar cell with high photoelectric conversion efficiency.

The invention discloses a method for processing a semiconductor chip. The method comprises that: pollutants attached on the semiconductor chip are removed so that the cleaned semiconductor chip is acquired; and the mixed gas meeting the first preset condition is piped into a finishing stove in which the cleaned semiconductor chip is positioned so that a dangling bond at the interface of a gate electrode oxide layer and poly-silicon in the semiconductor chip is adjusted into a silicon hydrogen bond, wherein the mixed gas comprises nitrogen and hydrogen.