16 results about "Telechelic polymer" patented technology

The invention provides a method for improving lubricating property and wear resistance of base oil and a method for improving dispersion stability of graphite in the base oil. A telechelic polymer is adopted, the telechelic polymer is composed of an oil-soluble central chain and two non-oil-soluble pyrene functionalized end-group chains, and the telechelic polymer can be self-assembled into a completely cross-linked, rodlike and stable gel network through pi-pi stacking interaction. The telechelic polymer is added into the base oil, so that stable oil gel can be formed, on one hand, leakage and wriggling of the base oil can be remarkably relieved, and on the other hand, the lubricating property and wear resistance of the base oil can be improved; when graphite or a derivative thereof is also added, the lubricating property and the wear resistance can be further improved, particularly when the graphite is added, the graphite can be stripped into graphene in situ under the assistance of ultrasonic waves, the cost is low, the method is simple and easy to implement, and the dispersion stability of the graphite is improved.

A method for preparing a telechelic polymer, the method comprising (i) providing a dilithium initiator prepared by reacting dialkenyl compound with an alkyl lithium compound; (ii) combining the dilithium initiator and conjugated diene monomer to form a reactive difunctional diene oligomer; (iii) introducing the difunctional diene oligomer and additional diene monomer; (iv) allowing the additional diene monomer to polymerize and form a polymer having first and second reactive ends; and (v) reacting the first and second reactive ends with a functionalizing agent to thereby form a telechelic diene polymer.

The invention discloses a method for continuous photochemical synthesis of telechelic polyisobutene and application thereof. The method is applied to a micro-reaction device and comprises the following steps: (1) dissolving external olefin terminated polyisobutene, sufficient sulfydryl monomers and a photosensitizer into an organic solvent, and fully dissolving to provide a homogeneous mixture; and (2) cooling the homogeneous mixture obtained in the step (1), adding the homogeneous mixture into a micro-reaction device through a pump, irradiating a micro-reaction channel by using an ultraviolet irradiation unit, and carrying out polymerization reaction to obtain telechelic polyisobutene. The invention provides a method for synthesizing telechelic polyisobutene under mild reaction conditions, a photocatalytic reaction technology is combined with a microreactor, and the economic benefit is greatly improved compared with that of traditional polymerization.

The present invention relates to telechelic polymers of formula Z1-POLY-Z2, wherein the term "POLY" denotes a polymer chain comprising 1,3-diene units, ethylene units and cyclic units 1,2-cyclohexane units, Z1 and Z2 denote groups comprising a functionality, Z1 and Z2 are identical, said polymers having a macrostructure defined by a polydispersity of less than 1.5 or a number average molecular weight of more than 10000 g / mol.

The application relates to the technical field of acoustic materials, in particular to a sound matching material, a preparation method thereof, an ultrasonic transducer, an ultrasonic probe and an ultrasonic imaging device. The sound matching material comprises a polystyrene telechelic polymer with a chemical structure as shown in formula I: wherein n1 and n2 are positive integers; X comprises at least one of halogen atoms, hydroxyl groups, carboxyl groups, amino groups, propargyl groups, methoxyl groups, azido groups, pyrimidyl groups and malonate groups. The sound matching material has not only good low sound attenuation characteristics, but also good bonding performance, can improve the stable reliability of sound transmission, and has a good application prospect in medical ultrasonic probes.

The invention discloses an upward hole on-site mixed porous granular ammonium nitrate fuel oil explosive which is characterized by comprising the following raw materials in parts by mass: 92-96 parts of porous granular ammonium nitrate, 3-4 parts of an oil phase material, 0.5-2 parts of a hydroxyl-terminated telechelic polymer, 0.45-1.8 parts of a chain extender and 0.05-0.2 part of a curing agent. Wherein the hydroxyl-terminated telechelic polymer can react with the curing agent to form a cross-linked high polymer material, so that the adhesive property of the explosive and the anti-falling property of the explosive when the explosive is used in an upward hole are enhanced; the chain extender further optimizes the viscoelasticity of the explosive by extending a polymer chain segment and adjusting the crosslinking density, so that the anti-falling performance of the explosive is more excellent; the oil phase material can be tightly combined with the porous granular ammonium nitrate, so that the explosion performance of the explosive is improved. The on-site mixed and loaded porous granular ammonium nitrate fuel oil explosive provided by the invention has excellent anti-falling performance during upward hole loading, also has an excellent detonation effect, and has a relatively high popularization value.

The invention provides a high-performance asphalt modifier as well as a preparation method and application thereof, and relates to the technical field of pavement materials. The high-performance asphalt modifier is prepared from 30 to 38 parts of an epoxy-terminated telechelic polymer; 22 to 30 parts of a hydroxyl-terminated telechelic polymer; 15 to 23 parts of a blocked polyurethane prepolymer; 2-6 parts of a tertiary amine structure-containing auxiliary agent with warm mixing and catalytic curing effects; 9 to 16 parts of a diluent; and 2-6 parts of a vulcanizing agent. According to the modifier, the telechelic polymer and the closed prepolymer are utilized to construct an epoxy / polyurethane cross-linked network, and the vulcanizing agent is supplemented for reinforcement, so that the comprehensive pavement performance such as high and low temperature and fatigue resistance of asphalt is comprehensively improved while the normal-temperature storage stability is guaranteed. The auxiliary agent containing the tertiary amine structure not only can catalyze rapid curing of a network, but also endows the asphalt with an excellent warm mixing effect, so that the construction temperature and energy consumption are remarkably reduced, and the paving quality in a low-temperature environment is effectively guaranteed.

This dielectric body for a dielectric transducer exhibits a stress retention rate [%] of 90% of more, which is determined from a stress F1 and a stress F2 found in a stress relaxation test, by the mathematical formula F2 / F1 × 100, the stress F1 being the stress that occurs when the dielectric body is stretched to a deformation of 20% and the stress F2 being the stress that occurs after the dielectric body is subsequently held stretched for 30 minutes. Further, the dielectric body for a dielectric transducer has, as a main component, a reactant of a telechelic polymer having, on a weight average basis, 2.0 to 3.9 reactive functional groups per molecule, and a weight average molecular weight of 2,000 or more. Provided is a dielectric body for a dielectric transducer, said body demonstrating a high output when used in a dielectric actuator or a dielectric sensor.

The invention provides a telechelic polymer, a preparation method thereof, supramolecular oil gel and lubricating oil. The telechelic polymer consists of an oil-soluble central chain and two non-oil-soluble pyrene functionalized end-group chains, and can be self-assembled into a completely cross-linked, rodlike and stable gel network through pi-pi accumulation interaction. By adding the telechelic polymer into the base oil, stable oil gel can be formed, on one hand, leakage and wriggling of the base oil can be remarkably relieved, and on the other hand, the lubricating property and wear resistance of the base oil can be improved; when graphite or a derivative thereof is also added, the lubricating property and the wear resistance can be further improved, particularly when the graphite is added, the graphite can be stripped into graphene in situ under the assistance of ultrasonic waves, so that the cost is low, the method is simple and easy to implement, and the dispersion stability of the graphite is improved; therefore, the oil gel can be applied to the field of mechanical lubrication as lubricating oil.

The invention relates to an organomagnesium compound of formula RB—(Mg—RA)m—Mg—RB, RB comprising a benzene nucleus substituted with the magnesium atom, one of the carbon atoms of the benzene nucleus ortho to the magnesium being substituted with a methyl, an ethyl or an isopropyl or forming a ring with the carbon atom which is its closest neighbour and which is meta to the magnesium, the other carbon atom of the benzene nucleus ortho to the magnesium being substituted with a methyl, an ethyl or an isopropyl, RA being a divalent aliphatic hydrocarbon-based chain, optionally interrupted with one or more oxygen or sulfur atoms or with one or more arylene groups, m being a number greater than or equal to 1, preferably 1. When used as co-catalyst of a rare-earth metallocene, it allows the synthesis of telechelic polymers.

The present disclosure relates, in part, to cross-linked telechelic polymer compositions and methods of preparation thereof. In another aspect, the present disclosure relates to multilayer compositions comprising an adhesive base (AB) and a mechanically reinforcing composition (MRC), methods of preparation thereof, and methods of use thereof. In certain embodiments, the in situ prepared compositions are suitable for application to the skin of a subject for treating a wound and / or skin condition.

The application provides a telechelic polymer, a preparation method thereof, a supramolecular oil gel and lubricating oil. The telechelic polymer is composed of an oil-soluble central chain and two non-oil-soluble pyrene-functionalized end chain, and can self-assemble into a fully cross-linked, rod-shaped and stable gel network through pi-pi stacking interaction. The addition of the telechelic polymer of the application into base oil can form a stable oil gel, which can not only significantly alleviate the leakage and peristalsis of the base oil, but also improve the lubricating performance and anti-wear performance of the base oil; when graphite or its derivatives are further added, the lubricating performance and anti-wear performance can be further improved, especially when graphite is added, the graphite can be in-situ exfoliated into graphene under the assistance of ultrasonic, which is not only low in cost, simple and easy to implement, but also improves the dispersion stability of the graphite; therefore, the oil gel can be applied to the field of mechanical lubrication as lubricating oil.

A telechelic polymer of formula Z1-POLY-Z2 is provided. The term “POLY” denotes a polymer chain comprising units of a 1,3-diene, ethylene units and cyclic units, 1,2-cyclohexane units, Z1 and Z2 denoting a group containing a function, Z1 and Z2 being identical. The polymer has a macrostructure defined by a dispersity of less than 1.5 or by a number-average molar mass of greater than 10 000 g / mol.

A catalytic system based on at least one rare-earth metallocene and an organomagnesium reagent as co-catalyst of formula RB—(Mg—RA)m—Mg—RB is provided. According to the formula, RB comprises a benzene nucleus substituted with the magnesium atom. One of the carbon atoms of the benzene nucleus ortho to the magnesium is substituted with a methyl, an ethyl or an isopropyl or forms a ring with the carbon atom which is its closest neighbour and which is meta to the magnesium. The other carbon atom of the benzene nucleus ortho to the magnesium is substituted with a methyl, an ethyl or an isopropyl. RA is a divalent aliphatic hydrocarbon-based chain, optionally interrupted with one or more oxygen or sulfur atoms or with one or more arylene groups. The m is a number greater than or equal to 1, preferably 1. The catalytic system allows the synthesis of dienic and / or ethylenic telechelic polymers.

Embodiments of the present disclosure are directed towards thermally conductive compositions including a urethane / acrylic telechelic polymer, a thermally conductive filler, and an amine.

A catalytic system based on at least one rare-earth metallocene and as co-catalyst an organomagnesium reagent of formula X—Mg—RA—Mg—X is provided. In the formula, RA is a divalent aliphatic hydrocarbon-based chain, optionally interrupted with an oxygen atom, a sulfur atom or with an arylene group, and X is a halogen atom. The catalytic system allows the synthesis of dienic and / or ethylenic telechelic polymers.