215results about How to "High storage modulus" patented technology

The present invention provides compositions and products, such as waxes and lubricants, comprising a plurality of nanoparticles dispersed in a continuous phase comprising a vegetable oil derived material, such as one or more vegetable oils or a synthetic product derived from one or more vegetable oils. Incorporation of nanoparticles in the present compositions is beneficial for providing mechanical, thermal and/or chemical properties useful for a selected product or product application. In some compositions of the present invention, for example, incorporation of the nanoparticle component provides compositions derived from one or more vegetable oils exhibiting enhanced mechanical stability, hardness, viscosity, thermal stability and mechanical strength.

This invention relates to a rubber composition having excellent workability, fracture characteristics and wear resistance and a low heat buildup and a high storage modulus (G'), and more particularly to a rubber composition comprising not less than 20 parts by mass of a reinforcing filler (B) and 5 to 60 parts by mass of a low-molecular weight aromatic vinyl compound-conjugated diene compound copolymer (C) having an aromatic vinyl compound content of 5 to 80% by mass, a vinyl bond content in a conjugated diene compound portion of 10 to 80% by mass and a weight average molecular weight as measured with a gel permeation chromatography and converted to polystyrene of 5,000 to 300,000 based on 100 parts by mass of a rubber component (A) containing not less than 10% by mass of a modified conjugated diene-based polymer having at least one functional group.

Mica is incorporated into a biodegradable resin material comprised mainly of polylactic acid, for example, into polylactic acid which is an aliphatic polyester resin. It is desired to incorporate into polylactic acid mica and a carbodiimide compound as an additive for suppressing hydrolysis of polylactic acid. Further, the biodegradable resin composition is subjected to aging by heating and desirably further using an electromagnetic wave or the like to suppress rapid lowering of the storage elastic modulus, and the biodegradable resin composition is used as a material for household electric appliances and housing materials.

The invention discloses a negative poisson ratio structural component based on an inner sunken hexagonal multi-cell unit. The negative poisson ratio structural component comprises a plurality of unitcell structures, each of the unit cell structures consists of two inner sunken hexagons, the inner sunken hexagons are in a left-right symmetric dovetail shape, and every two inner sunken hexagons arearranged in an orthogonal mode and intersect at two concave angle apexes to form a complete unit cell structure; the multiple unit cell structures are connected with each other horizontally in both directions by sharing one support cell arm, and are extended in the horizontal direction to form a continuous unit layer; and a plurality of unit layers are connected with each other in the vertical direction by sharing curved ribs to form a multi-layered cross-aligned inner sunken honeycomb-shaped three-dimensional negative poisson ratio structure. According to the negative poisson ratio structural component based on the inner sunken hexagonal multi-cell unit, a significant negative poisson ratio effect is achieved, higher elastic modulus, shear modulus and storage modulus can be generated when loaded, better rebound toughness and fracture resistance are achieved and improved with the enhancement of the negative poisson ratio effect.

This invention relates to a rubber composition having a high storage modulus (G′) and a low loss tangent (tan δ), and more particularly to a rubber composition comprising 2 to 60 parts by mass of a low-molecular weight aromatic vinyl compound-conjugated diene compound copolymer (B) having an aromatic vinyl compound content of 5 to 80% by mass, a vinyl bond content in a conjugated diene compound portion of 5 to 80% by mass, a weight average molecular weight as measured through a gel permeation chromatography and converted to polystyrene of 5,000 to 500,000 and at least one functional group based on 100 parts by mass of a rubber component (A) composed of at least one of natural rubber and synthetic diene-based rubbers.

The invention discloses a preparation method of a polycarbonate microporous material with bimodal distribution, aiming at solving the technical problem that the thermoplastic foam prepared by adopting the existing preparation method only has unimodal distribution or easily pollutes the environment. According to the technical scheme, the preparation method disclosed by the invention comprises the steps of: placing a polycarbonate sheet in CO2 fluid under a super-critical state to carry out saturation to obtain an even PC (polycarbonate)/CO2 mixture after being entirely saturated; carrying out first-time fast pressure relief within the time of 4-30 seconds, and keeping for 0.5-3 hours under the constant-temperature and constant-pressure state; carrying out second-time fast pressure relief within the time of 4-30 seconds, thus relieving the pressure in an autoclave to the atmospheric pressure; fast taking out the CO2 gas-containing polycarbonate sheet, transferring to a constant-temperature glycerol bath to carry out foaming; and finally, shaping the foamed polycarbonate sheet in an ice-water bath for 30 minutes to obtain the polycarbonate microporous material with bimodal distribution. The supercritical CO2 fluid used in the preparation method is low-cost, non-toxic and non-inflammable, and has no pollution to the atmosphere and water body, as well as no damage role to ozone sphere, thus being an environment-friendly physical foaming agent.

The invention relates to an adhesive and a preparation method thereof, a pressure-sensitive adhesive tape and a preparation method thereof. The adhesive comprises the following raw material componentsin parts by mass: 20-35 parts of butyl acrylate, 4-10 parts of a hard monomer, 0.4-1 part of a functional monomer, 0.1-0.5 part of an initiator and 60-70 parts of a solvent, wherein the hard monomeris selected from at least two of methyl acrylate, methyl methacrylate and glycidyl methacrylate, the functional monomer is selected from at least two of hydroxyethyl acrylate, acrylic acid and acrylamide, and the functional monomer contains hydroxyethyl acrylate. According to the adhesive, the hard monomer, the functional monomer, a soft monomer butyl acrylate and other raw material components arereasonably combined to form good physical crosslinking, so that heat resistance of the adhesive is remarkably improved, and no residual is left after the adhesive is attached to a product.

The invention discloses a preparation method of a hollow mesoporous silica microsphere-reinforced epoxy resin composite material. The preparation method comprises preparing hollow mesoporous silica microspheres, carrying out coupling treatment through a silane coupling agent, adding the coupled microspheres into an epoxy resin oligomer, carrying out vacuum mixing, ultrasonic treatment and vacuum-pumping treatment to obtain a hollow mesoporous silica microsphere/epoxy resin mixture, adding a curing agent and a promoter into the mixture, carrying out curing at 80-100 DEG C for 3-6h, and carryingout curing at 140-180 DEG C for 4-8h to obtain the hollow mesoporous silica microsphere-reinforced epoxy resin composite material. The preparation method has simple processes, realizes a low cost andeasily satisfies the requirements of industrial production. The hollow mesoporous silica microsphere-reinforced epoxy resin composite material has good comprehensive performances. Compared with the pure epoxy resin cured product, the composite material has higher glass-transition temperature, higher storage modulus, better tensile strength and better bending strength.

The invention discloses a composite material and interface structure and preparing method, which comprises the following steps: choosing medium hole polymer molecule organic monomer and reaction aids as raw material; adding the medium hole molecular screen into liquid organic monomer dissolved with reaction aids; generating organic polymer molecule in the pore path of the medium hole molecular screen; projecting along pore path to outside under proper polymeric condition; forming organic-inorganic interconnected network hybridization particle; merging the organic polymer molecule in molecular screen and homopolymer molecule out of the molecular screen tightly; forming the product. The interface structure of this composite material likes 'rambutan' appearance, which hot property and dynamic property possesses bigger improvement.

An object of the present invention is to provide a golf ball resin composition excellent in shot feeling and resilience. The golf ball resin composition includes (A) at least one resin component selected from the group consisting of (a-1) a binary copolymer composed of an olefin and an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms, (a-2) an ionomer resin consisting of a metal ion-neutralized product of the binary copolymer components, (a-3) a ternary copolymer composed of the binary copolymer components and an α,β-unsaturated carboxylic acid ester, and (a-4) an ionomer resin consisting of a metal ion-neutralized product of the ternary copolymer components; and (B) a basic metal salt of a fatty acid, and having a storage modulus E′ (Pa) and a loss modulus E″ (Pa) satisfying a following expression;

log(E′/E″²)≧−5.84

when measured in a tensile mode using a dynamic viscoelasticity measuring apparatus.

The invention discloses a steel bar structure unit with a negative poisson's ratio effect. The steel bar construction unit with the negative poisson's ratio effect is composed of parallelly arranged n layers of steel bar hinges, the steel bar hinges are of axisymmetric polygon structures with inward concave angles. The layer interval is 30mm-150mm; the symmetrical polygon structures are six-rowed inward concave structures, eight-rowed inward concave structures, ten-rowed inward structures or twelve-rowed inward concave structures. The inward concave angles are beta<1>=90 degrees-150 degrees, beta<2>=100 degrees-160degrees, beta<3>=110 degrees-160degrees and beta<4>=110 degrees-170degrees; the diameters of circumcircles of the axisymmetric polygon structures are 90 mm-160 mm. The invention further discloses an anti-explosion steel bar concrete with a negative poisson's ratio effect composed of the steel bar structure unit poured with concrete. Compared with normal steel bar concrete, the storage modulus of the anti-explosion steel bar concrete can be maximized to 483%, and thus the ability to resist and absorb explosion load energy is sharply improved.

An object of the present invention is to provide a golf ball polyurethane composition excellent in resilience. Another object of the present invention is to provide a golf ball excellent in a shot feeling and resilience. The present invention provides a golf ball polyurethane composition comprising, as a resin component, a polyurethane elastomer including a polyisocyanate with one alicyclic hydrocarbon structure having 3 or more carbon atoms as a constituting component, and having a storage modulus E′ (Pa) and a loss modulus E″ (Pa) satisfying a following expression;

log(E′/E″²)≧−6.53

when measured in a tensile mode using a dynamic viscoelasticity measuring apparatus.

The invention discloses an anti-explosion porous concrete with a negative poisson's ratio effect. The anti-explosion porous concrete is of a communicating hole structure or an inner concave hole structure. The anti-explosion porous concrete is prepared from the following several ingredients: a cementing material, a water reducing agent, an exciting agent, foam stabilizes and a foaming agent, wherein through being metered in parts by weight, the use quantity of the foaming agent is 3 to 14 percent of the cementing material; the weight ratio of the foaming agent to the foam stabilizes is 0.6 to 4.2. The invention also discloses a preparation method of the anti-explosion porous concrete with the negative poisson's ratio effect. The porous concrete with the communicating hole structure and the inner concave hole structure is prepared; the poisson's ratio value of the communicating hole structure to the poisson's ratio value of the inner concave hole structure is 0.21 and 0.90. Compared with the ordinary porous steel bar concrete with the hole closing structure, the anti-explosion porous concrete has the advantages that the energy storage modulus is respectively improved by 261 percent and 372 percent, so that the capability of resisting and absorbing explosion load energy is greatly improved; the original structure is maintained not to be destroyed to the great degree.

The invention relates to a silver nano-particle hybrid supramolecular hydrogel based on cyclodextrin/PEG grafted polyacrylic acid, and a preparation method and an application thereof. The supramolecular hydrogel is characterized in that the molecular weight of an anionic polyelectrolyte PPEGMA-co-PAA is 10-600 kDa; a molar ratio of the PPEGMA to the PAA in the polymer is 10:1 to 1:4; and the content of nano-silver in the supramolecular hydrogel is 0.05-5%. The preparation process is simple, uniformly dispersed spherical nano-silver particles are obtained, and the agglomeration problem of nano-silver is effectively solved. A pure polymer system which only can form hydrogel under an acidic condition, but the above silver hybrid system also can form hydrogel under neutral and alkaline conditionms, so the pH value range of the hydrogel is enlarged. The nano-silver hybrid supramolecular hydrogel has self-repairing property and injectable performance, and has good application prospects in the fields of antibacterial agents and wound healing.

The invention discloses high-performance bio-based composite film and a preparation method thereof, and belongs to the technical field of functional materials. The method mainly adopts polylactic acidas matrix, and uses cellulose nanocrystal as a reinforcing filler, composite fiber film is prepared by an electrospinning method, the addition of the cellulose nanocrystals can increase the storage modulus of the composite film by up to 500%, after water is absorbed, the storage modulus can be increased by up to 900%, the storage modulus of the composite film is obviously improved, pores are larger, cells can be effectively adsorbed and grown on the fiber film, the mechanical strength is also improved, and the addition of the the cellulose nanocrystals further broadens the application of polylactic acid in the field of biomedicine. The method uses an acid hydrolysis method to prepare the cellulose nanocrystals, cellulose raw material sources are wide, the acid hydrolysis method is simpleand easy to operate, and a product price is low. The film functions as a medical stent to promote drug absorption and cell growth.

The invention relates to a preparation method of a carboxymethyl cellulose based reversible photochromic hydrogel. The preparation method comprises the following steps: dissolving carboxymethyl cellulose of different substitution degrees into water to prepare a carboxymethyl cellulose aqueous solution, preparing a phospho-tungstic acid aqueous solution, mixing the phospho-tungstic acid solution and the carboxymethyl cellulose aqueous solution under the condition of continuous stirring, controlling addition manner and dosage of phospho-tungstic acid, and finally stopping stirring and standing for 2h so as to obtain the carboxymethyl cellulose based hydrogel.

The invention belongs to the field of rubber and plastic filler and particularly relates to polystyrene/silicon dioxide organic-inorganic hybrid Janus nano-particles grafted with polymers on the surface by utilizing a plurality of chemical reactions as well as a preparation method and an application thereof. According to the preparation method of the hybrid Janus nano-particles obtained through polymer grafting modification, the single spherical surface or dual spherical surfaces of the Janus nano-particles comprising polystyrene spheres and silicon dioxide spheres which are connected through chemical bonds are grafted with the polymers, wherein the dual spherical surfaces are grafted with the same or different polymers; after a rubber material is filled with the polystyrene/silicon dioxide organic-inorganic hybrid Janus nano-particles grafted with polymers, the dispersity is good, the stress at definite elongation and the general storage modulus of the rubber material are increased, the abrasive resistance, tearing resistance, strength and elongation at break are all obviously improved. Especially for different rubber blended systems, the Janus nano-particles grafted with different rubber molecules can remarkably improve the mixing effect of different rubbers, so that the general property of multi-element rubber can be given a full play.

A phosphor-containing sheet having a storage modulus of 0.1 MPa or more at 25° C. and a storage modulus of less than 0.1 MPa at 100° C., wherein a resin main component of the phosphor-containing sheet is a crosslinked product formed by subjecting a crosslinkable silicone composition containing a specific composition to a hydrosilylation reaction. This phosphor-containing sheet provides a phosphor sheet having good shapability and high adhesive power as a phosphor sheet bonded to an LED chip as a wavelength conversion layer.

The invention relates to a preparation method of nano-silica with the surface grafted with polystearylmethacrylate, belonging to the field of surface grafting and modification of nano-particles. The preparation method comprises the following steps of firstly grafting amino silane to the surface of nano-silica in a high polar solvent by virtue of a reversible addition-fragmentation chain transfer polymerization method; then grafting a chain transfer agent to the surfaces of nano-particles through amino silane by virtue of the combination between thiol ester functional groups and amino functional groups on the chain transfer agent; finally providing free radicals by an initiator, and polymerizing monomers of polystearylmethacrylate to the tail end of the chain transfer agent. According to the polystearylmethacrylate-grafted nano-silica nano-particles prepared by virtue of the preparation method, the dispersity of nano-silica in low density polyethylene and a crosslinked polyethylene matrix is improved. According to the preparation method, a firm foundation is laid for the further improvement of mechanical and electrical properties of polyvinyl nano-composite materials.

The invention discloses a dual-component in-situ injection type polyasparagine bionic tissue adhesive and a preparing method thereof. The tissue adhesive is composed of a first polyasparagine component solution and a second polyasparagine component solution with different reactive functional groups. A first component is polyasparagine with a vinyl functional group, a catechol functional group anda hydroxyl functional group, a second component is polyasparagine with a sulfydryl functional group, a catechol functional group and a hydroxyl functional group, a solvent of the first component is ahydrogen peroxide solution, and a solvent of the second component is a horse radish peroxidase solution. The catechol functional groups in the first component and the second component have the marinemussel imitation adhesion characteristic and can have noncovalent interaction with a tissue surface, the adhesive has tissue adhesiveness, and tissue repairing is realized. The tissue adhesive has excellent tissue adhesive strength and use convenience and has important significance in replacing surgical sutures and healing wounds.

The invention discloses an ABS (Acrylonitrile Butadiene Styrene)-based nanocomposite for 3D (Three-dimensional) printing. The nanocomposite is prepared from the following components in parts by weight: 54 to 60 parts of ABS, 4.8 to 9 parts of TPU (Thermoplastic Polyurethane), 4 to 8 parts of modified nanometer silicon dioxide master batch, 0.5 to 0.7 part of plasticizer, 2 to 4 parts of solubilizing agent and 0.5 to 0.7 part of antioxidant. The preparation method comprises three steps: I, performing surface treatment on nanometer silicon dioxide; II, preparing first-grade master batch from the modified nanometer silicon dioxide and ABS particles; III, mixing the first-grade master batch, the ABS, the TPU, the plasticizer, the solubilizing agent and the antioxidant, and adding the mixture into a double-screw extruder for extruding and granulating to obtain the ABS-based nanocomposite. The ABS-based nanocomposite for 3D printing provided by the invention has high impact resistance, high toughness and superior mechanical performance and thermal performance.