21 results about "Functionalized polyethylene" patented technology

An extreme-cold resistant low-fume halogen-free flame-retardant polyolefin sheath, a preparation method therefor, and a cable. The sheath comprises the following raw materials in parts by mass: 4-16 parts of an ethylene-vinyl acetate copolymer, 7-13 parts of a phosphate group functionalized linear low-density polyethylene, 9-15 parts of an ethylene-octene copolymer, 5-10 parts of a maleic anhydride-grafted ethylene-methyl methacrylate copolymer, 10-15 parts of magnesium hydroxide, 40-50 parts of aluminum hydroxide, etc. The preparation method for the phosphate group functionalized linear low-density polyethylene comprises: adding a catalyst to a pre-cooled ethylene monomer, adding a vinyl phosphate ester and an initiator after the reaction, and reacting for 1-2 hours at a temperature of 65-75°C and a pressure of 15-35 Mpa and then terminating the reaction, thereby obtaining the phosphate group functionalized linear low-density polyethylene. Compared with unfunctionalized polyethylene, the phosphate group functionalized polyethylene used has greatly improved low-temperature and flame-retardant performance, and can improve the overall flame-retardant and low-temperature performance of the formula.

The application discloses a high-temperature-resistant power cable and a preparation method thereof. A copper conductor is twisted to form a core, and an insulating layer, a shielding layer and a protective layer are sequentially coated on the surface of the core to obtain the high-temperature-resistant power cable. The protective layer is a reinforced resin, and the reinforced resin comprises the following raw materials in parts by weight: 100-120 parts of functionalized polyethylene, 20-30 parts of modified filler, 0.5-0.8 parts of p-toluenesulfonic acid and 10-15 parts of 1,4-p-biphenyl boronic acid bis(pinacol) ester. The functionalized polyethylene and the modified filler form an organic-inorganic interpenetrating network under the action of the 1,4-p-biphenyl boronic acid bis(pinacol) ester. The modified filler can form a thermal barrier network in the whole matrix, effectively hinders the thermal motion of the polyethylene molecular chain, and the side chain of the functionalized polyethylene molecular chain contains a phenyl polysiloxane structure, which can increase the flexibility of the polyethylene chain segment. In combination with the formation of dynamic crosslinking, the high-temperature-resistant effect of the material is greatly improved.

The present application relates to the technical field of high polymer material modification, and particularly relates to a kind of heat-reversible crosslinking polyethylene material based on Diels-Alder synthesis and a preparation method thereof.The preparation method comprises: maleic anhydride polyethylene is melt grafted with excess furan methylamine, then is treated by high temperature and high pressure dehydration ring closure to form stable furan functionalized polyethylene; then melt blend with bismaleimide, and by low temperature long time annealing treatment, to promote Diels-Alder reaction to proceed fully, so as to build a perfect heat-reversible crosslinking network.The present application has the beneficial effects that the obtained heat-reversible crosslinking polyethylene material has excellent temperature mechanical strength, solvent resistance and clear heat-reversible characteristics, and can be uncrosslinked at higher than 150 DEG C to realize melt reprocessing, and the network is reconstructed after cooling, and the strength retention rate is still higher after two times of recycling.The present application solves the problem of non-recyclable traditional crosslinking polyethylene, and is particularly suitable for recyclable products such as packaging and pipe.

A multilayer polymer pipe including a first tubular layer, the first layer having as main component one or more polyethylene polymers and which layer further includes at least one compatibilizer, preferably a functionalized polyethylene polymer, a second layer surrounding the first layer, the second layer including one or more polyamide polymers and being substantially free of compatibilizer, a third layer surrounding the second layer, the third layer including one or more polyketone polymers and being substantially free of compatibilizer, a fourth layer surrounding the third layer, the fourth layer including one or more polyamide polymers and being substantially free of compatibilizer, a fifth layer surrounding the fourth layer, the fifth layer including as main component one or more polyethylene polymers and which further includes at least one compatibilizer, preferably a functionalized polyethylene polymer.

A device containing glass beads functionalized with polyethyleneimine which is adsorbed on the surface of the glass beads, and the use thereof for capturing microorganisms for implementing a method for removing microorganisms or for diagnosing. The microorganisms can be chosen in particular from bacteria and Fungi, in particular yeasts and fungi.

The invention relates to the technical field of biological medicine, in particular to functionalized lipopeptide and a preparation method thereof, a functionalized lipopeptide-assisted nucleic acid drug lipid nano delivery system and application thereof. The functionalized lipopeptide is a compound formed by functionalized polyethylene glycol-lipid and partially or completely exposed amino groups of the functionalized hybrid polypeptide through a click chemical reaction or a Michael addition reaction; the functionalized hybrid polypeptide is a compound formed by an esterification reaction of an N-hydroxysuccinimide-polyethylene glycol-group and partially or completely exposed amino groups of the functionalized polypeptide. The lipopeptide provided by the invention is simple in preparation process and low in toxicity, and the lipopeptide-assisted nucleic acid drug lipid nano delivery system can realize high-efficiency delivery of various nucleic acid molecules such as siRNA, mRNA and DNA in vitro and in vivo and has a treatment effect on various diseases.

The present invention relates to an article comprising a support at least partially provided with a coating, wherein i) the support comprises or consists of a thermoplastic composition comprising a polycarbonate, ii) the coating is applied directly on the support and comprises or consists of a polyurethane obtained by reacting at least one di- or tri-isocyanate and at least one polyol, iii) the polycarbonate comprises at least 50 wt% of a first polycarbonate based on the weight of the polycarbonate, the first polycarbonate having an end hydroxyl content of at least 500 ppm, and wherein the thermoplastic composition comprises a polymer selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate, acrylonitrile-butadiene-styrene copolymer, styrene-acrylonitrile copolymer, optionally functionalized polypropylene, optionally functionalized polyethylene, optionally functionalized polyolefin elastomer, (meth)acrylic-polybutadiene core-shell copolymer and a mixture of at least two of the foregoing.

According to various embodiments, an extruded foam is formed from a composition comprising 1 to 99 weight percent of a silicone-functionalized polyethylene comprising the reaction product of the polymerization of ethylene and a (meth)acrylate-functionalized polydimethylsiloxane, and a physical blowing agent. The foam has a density of 0.200 g / cm3 or less as measured according to ASTM D1622-88 at 25°C. 3 It has the following density:

An article comprising at least one metal layer, at least one polypropylene layer, and a coextruded multilayer adhesive film that adheres the polypropylene layer to the metal layer. The coextruded multilayer adhesive film includes at least a first layer and a second layer. The first layer comprises crystalline block composite (CBC) including a crystalline ethylene-based polymer (CEP) comprising at least 60 mol %polymerized ethylene by weight of the CEP, an alpha-olefin-based crystalline polymer (CAOP) and a block copolymer including an crystalline ethylene block (CEB) comprising at least 60 mol %polymerized ethylene by weight of the CEB and a crystalline alpha-olefin block (CAOB). The second layer comprises functionalized polyethylene including polyethylene grafted with ethylenically unsubstituted dicarboxylic acid or derivative thereof.

The application belongs to the technical field of medicine, and discloses a nano-carrier capable of penetrating through the blood-brain barrier and improving brain delivery efficiency, and a preparation and application thereof. The preparation method comprises the following steps: 1) dopamine hydrochloride is deposited on the surface of nanoparticles through an oxidative self-polymerization reaction to obtain polydopamine modified particles; and 2) glucose functionalized polyethylene glycol and end-capped polyethylene glycol are reacted with the polydopamine modified particles to obtain the nano-carrier. The polydopamine coating is used to modify the nanoparticles, and the glucose functionalized polyethylene glycol is used to secondarily modify the polydopamine coating, so that the ability of the nanoparticles to penetrate through the BBB and enter brain tissues and brain gliomas is enhanced. The targeting effect of the glucose functionalized PEG and the synergistic effect of the PDA coating in enhancing cell uptake are combined in the application, so that the brain and brain tumor delivery capacity of the nano-carrier is enhanced. The nano-carrier is used for loading drugs.

The invention relates to the technical field of special high polymer materials, in particular to polyetherimide polyethylene composite bonding resin with high heat resistance and high bonding performance and a preparation method of the polyetherimide polyethylene composite bonding resin. 3 to 8 parts of polytetrafluoroethylene ultrafine powder plasticized by ionic liquid; 5-12 parts of a liquid metal core-shell structure filler; 15 to 30 parts of bio-based polyetherimide with a carbodicyclic structure; 35 to 55 parts of cyclodextrin coated metallocene polyethylene; 25 to 45 parts of radiation grafting functionalized polyethylene; 4-9 parts of a boron-silicon-containing double-bond functional monomer; 2 to 6 parts of hyperbranched polysiloxane; 1-4 parts of a rare earth complex antioxidant; and 20-35 parts of a polyurethane, epoxy resin and acrylate ternary complex. Wherein the porous ceramic microspheres enhance the mechanical strength and the thermal stability, so that the synergistic improvement of the bonding strength and the thermal stability of the polyetherimide polyethylene composite bonding resin in a high-temperature environment is realized.

The invention belongs to the technical field of polyolefin, and particularly relates to a preparation method of functionalized polyolefin for a high-filling flame-retardant cable. According to the preparation method disclosed by the invention, a polyolefin matrix is subjected to melt grafting through MAH / St double monomers, and core-shell-surface gradient structure functionalized polyethylene wax is synergistically introduced, so that a multi-layer tough interface system is constructed. The MAH / St grafted chain provides a polar site, and the polyethylene wax takes an annular surface layer and a nano SiO2 core as an interface bridging anchoring point, so that agglomeration of a high-content flame retardant is inhibited, a filling weak point is converted into a toughening point, LOI and UL94 V-0-level flame retardant performance is remarkably improved, the tensile strength and the elongation at break are synchronously improved, and the problems of high filling embrittlement and performance degradation are solved. Meanwhile, by means of narrow-distribution polyethylene wax prepared through controllable polymerization and a compound antioxidant system, intrinsic thermal stability and aging resistance of the material are synergetic, T5% is remarkably higher than that of a conventional system, it is guaranteed that the cable operates for a long time and is stable in performance under short-time overload, thermal aging failure is delayed, and safety and reliability of long-term operation are improved.

The invention discloses a preparation method and application of multifunctional hydrogel with a space-time cascade repair mechanism. The preparation method comprises the following steps: based on norbornene modified 8-arm polyethylene glycol, forming a covalent cross-linked network through a thiol-norbornene light click reaction initiated by ultraviolet rays; and S-nitroso glutathione functionalized polyethylene glycol macromolecules and calcium ion chelated nanoparticles SPCa < 2 + > are loaded. The hydrogel precursor also includes an MMP sensitive peptide, a photoinitiator LAP, and an RGD peptide. Through multiple synergy among photo-thermal sterilization, promotion of angiogenesis by NO and promotion of osteogenic differentiation by Ca < 2 + >, an antibacterial-vascularization-repair integrated delivery system is constructed, a new strategy is provided for precise synergistic treatment of infectious bone defects, and the system has important scientific research value and wide clinical transformation prospects.

This disclosure provides a method for preparing nanoparticles, the method comprising: mixing amino-functionalized polyethylene nanoparticles with nano-metal particles to obtain polyethylene nanoparticles with the nano-metal particles bound to their surface; mixing the polyethylene nanoparticles with the nano-metal particles bound to their surface with triethanolamine, hexadecyltrimethylammonium bromide, and tetraethoxysilane to obtain polyethylene nanoparticles coated with a mesoporous silica shell; and calcining the polyethylene nanoparticles coated with the mesoporous silica shell to obtain calcined particles. This disclosure also provides the nanoparticles prepared by this method and their use in the preparation of surface-enhanced Raman scattering (SERS) detection kits. The nanoparticles of this disclosure further mitigate the "protein crown" effect of SERS-labeled nanoprobes, improving the stability and accuracy of the Raman signal.

The application discloses a fluorinated polymer and application thereof in electrode protection layer and solid-state electrolyte, and belongs to the technical field of lithium metal secondary batteries. The fluorinated polymer is obtained by the reaction of acrylate functionalized polyethylene glycol, HFBA and an initiator. When the fluorinated polymer is used as a lithium metal negative electrode protection layer, a LiFePO4 / Li full battery protected by the polymer shows more excellent cycle performance than an unprotected full battery. The battery cycle performance is stable, the capacity retention rate is high, and the capacity attenuation speed is slow. When the fluorinated polymer is applied to a solid-state electrolyte, the polymer solid-state electrolyte can form a polymer network to wrap ion-conducting plastic crystals through in-situ reaction, effectively inhibits the growth of Li dendrites, and ensures the stability of the polymer electrolyte and the lithium negative electrode. Moreover, the solid-state electrolyte can be adapted to high-nickel ternary positive electrode materials, providing a train of thought for realizing stable, safe and high-energy-density batteries.

The present invention relates to a glass fibre reinforced thermoplastic polymer composition comprising a core and a thermoplastic polymer sheath surrounding said core, wherein the core comprises glass fibres and an impregnating agent, and the sheath comprises a high-density polyethylene and a coupling agent, wherein the coupling agent is a functionalized polyethylene grafted with an acid or acid anhydride functional group. The invention further relates to a method for producing such compositions as well as structural parts made therefrom.

The application discloses a high-strength PE pipe and a preparation method thereof. The PE pipe comprises the following raw materials in parts by weight: 100-120 parts of functionalized polyethylene, 3-5 parts of modified carbon nanotubes and 5-8 parts of modified fillers. In the raw material melting extrusion and cooling process, maleic imide on the surface of the modified fillers can react with furan on the side chain of the functionalized polyethylene and furan on the modified carbon nanotubes, and then dynamic cross-linking is formed in the material, and the imine structure on the surface of the modified fillers is matched, so that the impact resistance of the PE pipe is increased. Meanwhile, the addition of the structures of the carbon nanotubes and the silicon dioxide can ensure that the impact resistance of the pipe is increased and the tensile strength of the pipe is improved, and a nano skeleton is formed in the material, stress is effectively borne and dispersed, and the mechanical properties of the pipe are effectively improved.

This invention discloses a thiol-functionalized polyvinyl alcohol (PVA) / sodium alginate (SA)@ZIF-67 composite hydrogel, its preparation method, and its applications. The preparation method uses PVA and SA as matrices, forming hydrogel spheres through ionic crosslinking. After adsorbing cobalt ions, thiol-functionalized ZIF-67 crystals are grown in situ in a mixed ligand solution containing 2-methylimidazole and 2-mercapto-1-methylimidazole to obtain the PVA / SA@SH-ZIF-67 composite hydrogel. This invention achieves efficient adsorption and integrated "adsorption-reduction-fixation" removal of Cr(VI) by introducing thiol-functionalized ZIF-67 into the hydrogel network, utilizing the strong coordination and chemical reduction effects of thiol groups on hexavalent chromium. This composite hydrogel has advantages such as large adsorption capacity, high removal efficiency, and easy separation and recovery, and has broad application prospects in the field of heavy metal wastewater treatment.

This invention discloses a modified PTC composite material and its preparation method. It is prepared by compounding functionalized polyethylene, composite silicone resin, carbon nanotubes, and carbon black. During the blending process of functionalized polyethylene, composite silicone resin, carbon nanotubes, and carbon black, the furan in the side chains of the functionalized polyethylene can react with the maleimide (DA) structure on the composite silicone resin to form a three-dimensional reversible covalent network. This network can limit the irreversible re-aggregation of conductive fillers even when the matrix melts at high temperatures. Crosslinking treatment allows the composite material to maintain good room temperature resistance reproducibility after multiple cycles. Introducing pyrene groups into the branched arms of the composite silicone resin allows the large π-conjugated system of pyrene to undergo strong π-π stacking interactions with the surface of the carbon nanotubes, stabilizing the conductive network of the composite material. The flexible polysiloxane skeleton of the composite silicone resin can uniformly disperse external forces and thermal stress, avoiding microcracks induced by stress concentration and localized open circuits in the conductive network, thus increasing the service life of the material.

The invention relates to the technical field of nano-drugs, and discloses a lock-release switching type triptolide nano-micelle as well as a preparation method and application thereof. The preparation method of the triptolide nano-micelle comprises the following steps: S1, carrying out esterification modification on a polyamide-amine dendritic polymer by using folic acid to obtain FA-PAMAM; s2: S2-1, dissolving the FA-PAMAM, the triptolide and the calycosin into a solvent, and rotating to form a film, so as to obtain a film A; adding a phosphoric acid buffer solution, hydrating, incubating, and filtering to obtain a hydrated solution; s2-2, dissolving functionalized polyethylene glycol in a solvent, and rotating to form a film to obtain a film B; and hydrating the membrane B by using a hydration solution, and filtering to obtain the triptolide nano-micelle. The triptolide nano-micelle can be used for drug preparation through carrier structure innovation, drug synergy and targeted intelligent drug release, and realizes high-efficiency and low-toxicity treatment of rheumatoid arthritis.

According to various embodiments, a microcellular foam is provided, the microcellular foam comprising a polymer blend, the polymer blend comprising 70-95 wt% low-density polyethylene (LDPE) and 5-30 wt% polydimethylsiloxane-grafted LDPE (PDMS-g-LDPE), wherein the microcellular foam has an average cell size of less than 60 μm.