4591 results about "Backbone chain" patented technology

There is provided a copolymer containing tetrafluoroethylene unit and perfluoro (propyl vinyl ether) unit, wherein the copolymer has a content of perfluoro (propyl vinyl ether) unit of 4.3 to 6.0% by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 0.7 to 1.4 g / 10 min, and the number of functional groups of 20 or less per 106 main-chain carbon atoms.

Provided is a copolymer comprising tetrafluoroethylene unit and perfluoro(ethyl vinyl ether) unit, wherein the copolymer has a content of perfluoro(ethyl vinyl ether) unit of 4.5 to 6.2% by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 0.8 to 4.0 g / 10 min, and the number of functional groups of 20 or less per 106 main-chain carbon atoms.

There is provided a copolymer containing tetrafluoroethylene unit and perfluoro (propyl vinyl ether) unit, wherein the copolymer has a content of perfluoro (propyl vinyl ether) unit of 5.6 to 6.38 by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 17.1 to 23.0 g / 10 min, and the number of functional groups of 50 or less per 106 main-chain carbon atoms.

There is provided a copolymer containing tetrafluoroethylene unit and perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of perfluoro(propyl vinyl ether) unit of 5.5 to 6.5% by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 36.1 to 49.9 g / 10 min, and the number of functional groups of 50 or less per 106 main-chain carbon atoms.

There is provided a copolymer containing tetrafluoroethylene unit and perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of perfluoro(propyl vinyl ether) unit of 4.4 to 5.28 by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 11.0 to 16.0 g / 10 min, and the number of functional groups of 50 or less per 106 main-chain carbon atoms.

There is provided a copolymer containing tetrafluoroethylene unit and perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of perfluoro(propyl vinyl ether) unit of 6.2 to 7.1% by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 28.0 to 35.9 g / 10 min, and the number of functional groups of 20 or less per 106 main-chain carbon atoms.

There is provided a copolymer containing tetrafluoroethylene unit and perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of perfluoro(propyl vinyl ether) unit of 3.7 to 4.4% by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 28.0 to 34.0 g / 10 min, and the number of functional groups of 20 or less per 106 main-chain carbon atoms.

There is provided a powder coating material, comprising a copolymer comprising tetrafluoroethylene unit and perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of perfluoro(propyl vinyl ether) unit of 5.0 to 6.2% by mass with respect to the whole of the monomer units, the copolymer has a melt flow rate at 372° C. of 20.0 to 35.0 g / 10 min, and the copolymer has the number of functional groups of 100 or less per 106 main-chain carbon atoms.

There is provided a copolymer containing tetrafluoroethylene unit and perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of perfluoro(propyl vinyl ether) unit of 2.4 to 3.48 by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 0.8 to 1.4 g / 10 min, and the number of functional groups of 20 or less per 106 main-chain carbon atoms.

The invention belongs to the technical field of battery electrolytes, and particularly relates to a gel polymer electrolyte as well as a preparation method and application thereof. The gel polymer electrolyte is prepared through in-situ polymerization, and the electrolyte is composed of a monomer, a cross-linking agent, an initiator, an organic solvent and a lithium salt. The monomer is selected from fluorine-containing monomers such as trifluoroethyl acrylate, 2, 2, 3, 3-tetrafluoropropyl methacrylate and the like, and the cross-linking agent is selected from NH-containing cross-linking agents such as N, N '-methylene bisacrylamide, hexamethylene bisacrylamide and the like, so that a polymer side chain fluorine-containing functional group is formed in situ and interacts with lithium ions, and lithium ion transmission is promoted; and the NH functional group on the main chain limits the migration of anions, so that the ion migration number is increased. Therefore, the copolymerized fluorine-containing monomer and nitrogen-containing cross-linking agent gel polymer electrolyte enables the battery to show good specific discharge capacity and cycling stability under high current density.

The invention belongs to the technical field of anion exchange membranes, and relates to a cross-linked polyaromatic piperidine anion exchange membrane and a preparation method thereof. The exchange membrane structure comprises a copolymer structure of the following repetitive structural units, the selected rigid main chain polyaromatic hydrocarbon can ensure the mechanical strength of the anion exchange membrane, meanwhile, the toughness of the anion exchange membrane is further enhanced by adopting a cross-linked structure, and a formed cross-linked network can reduce swelling of the anion exchange membrane, so that the anion exchange membrane is more stable in performance. The mechanical performance is improved; according to the invention, ether-free skeleton polyaromatic hydrocarbon is selected as a main chain and has the characteristic of strong alkali-resistant stability, six-membered nitrogen heterocyclic ions are adopted as functional groups, and a large steric hindrance structure can hinder nucleophilic substitution and elimination reaction, so that the alkali-resistant stability of the anion exchange membrane is improved, and the service life of the anion exchange membrane is prolonged. And in the # imgabs0 #, X is equal to 0.05 to 0.15.

The invention provides application of polygonatum cyrtonema polysaccharide in preparation of medicines for treating ulcerative colitis or reducing blood glucose. A main chain of a sugar chain structure of the homogeneous polysaccharide PCP2 in polygonatum cyrtonema is mainly composed of-> 1)-beta-D-Fur-(2->,-> 1, 6)-beta-D-Fur-(2-> and-> 6)-alpha-D-Glcp-(1-> and beta-D-Fur-(2->), a side chain is mainly composed of beta-D-Fur-(2-> and-> 2)-beta-D-Fur-(6-> at a C-6 position of-> 1, 6)-beta-D-Fur-(2->), Fur represents furanose, Glcp represents glucopyranose, Glcp represents glucopyranose, and Glcp represents glucopyranose. The novel polysaccharide compound can relieve intestinal injury of mice, increase expression of tight nectin and mucoprotein, relieve oxidative stress reaction, promote production of short-chain fatty acid and improve composition of intestinal flora, and can be applied to the field of medicine as a medicine for treating ulcerative colitis. Meanwhile, the homogeneous polysaccharide PCP2 in polygonatum cyrtonema can significantly inhibit the activity of alpha-amylase and alpha-glucosidase, can also promote the ability of insulin resistance 3T3-L1 fat cells to uptake and consume glucose, shows a significant hypoglycemic effect, and has a good development prospect in the aspect of preparation of hypoglycemic drugs.

The invention relates to the technical field of epoxy resin paint, and discloses waterborne epoxy paint suitable for containers and a preparation method of the waterborne epoxy paint. A component A of the waterborne epoxy paint comprises, by weight, 100 parts of waterborne epoxy resin and 0.5-0.8 part of a flash rust inhibitor; the component B comprises 6-8 parts by weight of a polyamide curing agent, 5-12 parts by weight of an organosilicon sulfonate polyurethane toughening agent and 0.2-1 part by weight of graphene oxide; the organic silicon polyurethane flexibilizer can play a role of a dispersing agent, the dispersity of graphene in the waterborne epoxy paint is improved, the main chain of the organic silicon polyurethane flexibilizer contains imino groups, the organic silicon polyurethane flexibilizer can be subjected to a curing reaction with epoxy resin, a flexible organic polysiloxane molecular chain is bonded into an epoxy resin molecular chain, and the flexibility of the waterborne epoxy paint is improved. A good toughening effect is achieved, so that the flexibility, the impact resistance and the corrosion resistance of a paint film are improved.

Described herein are methods, compositions and articles of manufacture involving neutral conjugated polymers including methods for synthesis of neutral conjugated water-soluble polymers with linkers along the polymer main chain structure and terminal end capping units. Such polymers may serve in the fabrication of novel optoelectronic devices and in the development of highly efficient biosensors. The invention further relates to the application of these polymers in assay methods.

The invention discloses a waterproof heat-resistant adhesive and a preparation method thereof, and relates to the technical field of adhesives. Tetramethyltri-3-trifluoropropyl cyclotetrasiloxane is used as a raw material to prepare hydroxyl-terminated organic fluorosilicone oil and modified epoxy resin, fluorine atoms are closely arranged around a main chain of the hydroxyl-terminated organic fluorosilicone oil and modified epoxy resin in an umbrella shape, and the hydroxyl-terminated organic fluorosilicone oil and modified epoxy resin cooperate with organic silicon to improve the waterproof and heat-resistant effects; hydroxyl groups on the oxidized carbon nanofibers are reacted and combined with thiocyanate in vulcanized rubber powder, and hybrid filler is formed; residual active groups on the surface of the oxidized carbon fiber are combined and crosslinked with epoxy resin, so that the heat resistance of the epoxy resin is greatly improved; secondly, phenyl maleic anhydride is used as a cross-linking agent to form a three-dimensional cross-linked structure, and meanwhile, phenyl is introduced into the structure, so that the heat-resistant effect and the waterproof effect of the epoxy resin are further improved, and the adhesive prepared by taking the epoxy resin as the raw material has excellent waterproof and heat-resistant performance. The adhesive prepared by the invention has waterproof and heat-resistant effects.

The invention relates to the field of essential oil slow release, and discloses a mildew-proof tablet containing plant essential oil and a preparation method and application thereof.The mildew-proof tablet containing the plant essential oil comprises two epidermal layers and an essential oil slow-release layer arranged between the two epidermal layers, the preparation method comprises the following steps: grafting sodium abietate and aminated mesoporous silica to prepare functionalized mesoporous silica, loading plant essential oil on the functionalized mesoporous silica to obtain a core material, introducing dihydroxyl polyhedral oligomeric silsesquioxane into a polyurethane main chain, wrapping the core material to prepare an essential oil slow-release agent, taking lignin as a base material, taking the essential oil slow-release agent as an effective component, and preparing the essential oil slow-release agent. And preparing to obtain the essential oil slow-release layer. The prepared essential oil slow-release layer can achieve the effects of essential oil slow release and antibiosis and mildew prevention, the slow-release effect is remarkable under the normal-temperature and high-temperature conditions, the good slow-release effect is still kept in the humid environment, and the efficacy period of the material is greatly prolonged.

The present disclosure relates to polymers synthesized from ionomers having an aromatic hydrocarbon-containing backbone and an amine-containing ionic or ionizable moiety with polystyrene. The linkage between the ionomer and the polystyrene is made through covalent bonds or linking moieties. Electrochemical cells having polymer electrolyte membranes composed of the combined polymers are also described.

The invention provides a comb-shaped polymer binder, a pole piece and a battery, the comb-shaped polymer binder comprises an acrylate main chain, a flexible soft segment, a polar hard segment and a functional chain segment, the flexible soft segment, the polar hard segment and the functional chain segment are respectively grafted on the acrylate main chain, the flexible soft segment comprises an ether chain segment and / or an ester chain segment, the polar hard segment comprises a polar group and / or a first heteroaromatic ring group, and the functional chain segment comprises a functional group and a second heteroaromatic ring group. The functional chain segment comprises an aromatic ring group containing a pi-conjugated structure and / or a second heteroaromatic ring group containing a pi-conjugated structure. The comb-shaped binder adopts a structural design of'hard section anchoring + soft section buffering + functional side chain ', is helpful for enabling the binder to have high peel strength, stress buffering and electron conduction capabilities at the same time, is compatible with an existing wet coating-rolling process, is helpful for improving the peel strength and prolonging the cycle life of an electrode plate when being used for preparing the electrode plate, and is beneficial for improving the service life of the electrode plate. And the rate capability of the battery is improved.

The invention provides a novel polynorbornene anion exchange ionomer containing a polar functional group as well as a preparation method and application of the novel polynorbornene anion exchange ionomer. The polynorbornene has excellent thermal stability and chemical stability. Meanwhile, the AEI main chain of the polynorbornene has no aryl group, so that the adsorption influence caused by the aryl group is avoided. The synthesized addition polynorbornene AEI in the form of quaternary ammonium salt can be dissolved in a low-boiling-point solvent, and it is ensured that a membrane electrode can be prepared through a solvent casting method. Besides the solubility of the AEI, the addition polynorbornene-based AEI in the form of quaternary ammonium salt is modified by utilizing a thiol-ene click reaction, an anion exchange ionomer containing a polar functional group can be prepared, the interaction between the AEI and an electrolytic catalyst is improved, the reaction is simple and easy to operate, the universality is high, and the method is suitable for industrial production. And the current density in the AEMWE system containing the AEI can be effectively improved.

The invention discloses application of fucoidin degrading enzyme OUC-MgFucD1 in preparation of fucoidin oligosaccharide, and belongs to the technical field of preparation of the fucoidin oligosaccharide. The amino acid sequence of the fucoidin degrading enzyme OUC-MgFucD1 is as shown in SEQ ID NO. 1, and the fucoidin degrading enzyme OUC-MgFucD1 is as shown The fucose oligosaccharide is fucose, fucodisaccharide and fucotriose, the molecular formula of the fucose is C6H12O8S, the molecular formula of the fucodisaccharide is C12H22O15S2, and the molecular formula of the fucotriose is C18H32O16S. The invention further discloses a preparation method of the fucose oligosaccharide. The fucoidin degrading enzyme OUC-MgFucD1 disclosed by the invention can specifically act on fucoidin, and a specific fucoidin oligosaccharide combination is generated by precisely cutting a main chain glucosidic bond of the fucoidin. The invention provides a key technical support for the development of high-added-value fucoidan oligosaccharide products, and has important significance for promoting the industrial application of the fucoidan oligosaccharide in the fields of functional foods, biological medicines and the like.

The invention provides a solid-liquid combined synthesis method of semeglutide, which belongs to the technical field of semeglutide synthesis, and specifically comprises the following steps: segmenting a main chain of the semeglutide into three shorter polypeptide fragments, namely a fragment 4, a fragment 5 and a fragment 2 at sites 7-14, 15-22 and 23-37, and respectively synthesizing at the same time; performing solid-phase assembly on the fragment 4 and the fragment 5 to form 7-22 peptide fragments, namely a fragment 1, and after the fragment 1 is cut off from the resin, forming NHS ester at a C end; after the fragment 2 is assembled, selectively removing a protecting group A11oc on the Lys26, then connecting with a side chain for fatty acid treatment to form a fragment 3, and cutting off the fragment 3 from the resin; and connecting the NHS ester of the fragment 1 with the fragment 3 in a liquid phase reaction system. The crude semeglutide prepared by the synthetic method is relatively high in yield and purity. The refined semeglutide of which the purity is more than 99.3% and the content of single impurity is less than 0.1% can be obtained at high yield through a conventional purification means.

The invention relates to the technical field of all-vanadium redox flow batteries, in particular to a sulfonated polybenzimidazole proton exchange membrane as well as a preparation method and application thereof. The proton exchange membrane structurally comprises a polybenzimidazole polymer main chain and a sulfonic acid group, the free volume of the polybenzimidazole polymer is regulated and controlled by synthesizing raw materials with different structures, and the polybenzimidazole proton exchange membrane is obtained by sulfonating the polybenzimidazole polymer. Aiming at the problems of cross permeation of vanadium ion electrolyte of a positive electrode and a negative electrode of the all-vanadium redox flow battery, capacity attenuation of the all-vanadium redox flow battery and low energy conversion efficiency, the preparation method comprises the following steps: constructing a polybenzimidazole polymer main chain by selecting raw materials with high rigidity and high free volume; the mechanical property of the polybenzimidazole membrane is improved while a rapid ion channel is constructed in the polymer membrane, and water molecules can be contained to limit swelling of a membrane material.

An optically detectable label (102, 500) is provided comprising a nucleic acid backbone (108, 504) comprising multiple attachment positions (306, 308, 506a, 506b, 506c, 506d) including at least a first attachment position and a second attachment position. The optically detectable label (102, 500) further comprises multiple labelling moieties (106a, 106b, 106c, 106d, 106e, 310, 312, 502a, 502b, 502c, 502d), including at least a first labelling moiety and a second labelling moiety, each labelling moiety (106a, 106b, 106c, 106d, 106e, 310, 312, 502a, 502b, 502c, 502d) attached to a different one of the attachment positions (306, 308, 506a, 506b, 506c, 506d) of the nucleic acid backbone (108, 504). The first labelling moiety and the second labelling moiety are configured to form an energy transfer donor and acceptor pair. Further, the nucleic acid backbone (108, 504) has at least a first spatial state (300, 500a) and a second spatial state (322, 500b), wherein in the first spatial state the attachment position to which the first labelling moiety and the attachment position to which the second labelling moiety are attached to, are in proximity in order to enable an energy transfer between the first labelling moiety and the second labelling moiety. Moreover, the nucleic acid backbone (108, 504) is in the first spatial state (300, 500a) when a first staple strand (302, 510, 512) is bound to the nucleic acid backbone (108, 504). In further aspects, a marker (100) comprising the optically detectable label (102, 500) is provided and a method for analysing a biological sample.

The invention relates to a high-temperature proton exchange membrane, in particular to a high-temperature proton exchange membrane based on silica cross-linked polybenzimidazole and a preparation method of the high-temperature proton exchange membrane. The preparation method comprises the following steps: polymerizing 3, 3 '-diaminobenzidine, 4, 4'-diphenyl ether dicarboxylic acid and 5-hydroxyisophthalic acid to form a polybenzimidazole main chain containing an ether bond and a phenolic hydroxyl group, grafting a silane coupling agent on the polybenzimidazole main chain, and finally carrying out membrane formation and acid catalysis treatment to obtain the high-temperature proton exchange membrane based on silica crosslinked polybenzimidazole. A silicon-oxygen network structure is introduced into a polybenzimidazole main chain, so that the phosphoric acid retention rate and the oxidation resistance of the polymer film can be effectively improved, and the service life of the polymer film is prolonged.

The invention relates to a synthetic method of brominated polystyrene with high thermal stability. The synthetic method comprises the following steps: S01, dissolving polystyrene in a halogenated hydrocarbon solvent in a reaction bottle to obtain a polystyrene solution; s02, adding aluminum chloride and bromine into another reaction bottle; s03, introducing hydrogen bromide gas into the reaction bottle in S02, and starting stirring to react at room temperature; s04, after the reaction in the step S03 is finished, reducing the temperature of the polystyrene solution in the step S01 to the reaction temperature, starting stirring, adding a free radical inhibitor, and dropwise adding the bromine and catalyst mixed solution obtained by the reaction in the step S03 into the polystyrene solution; s05, after dropwise adding is finished, adjusting the temperature to the heat preservation temperature, and carrying out heat preservation reaction for a period of time; and S06, after the heat preservation is finished, carrying out post-treatment to obtain the brominated polystyrene. According to the synthetic method of brominated polystyrene, the halogenation phenomenon of a main chain can be inhibited, the use of a catalyst is reduced, and the thermal stability of brominated polystyrene is improved.

The invention discloses functional caprolactam, an intrinsic flame-retardant nylon material as well as a preparation method and application thereof, and relates to the technical field of flame-retardant nylon materials. The preparation method comprises the following steps: preparing an alpha-amino-epsilon-caprolactam intermediate by taking lysine as an initial raw material through one-step efficient cyclization, then reacting with a reagent containing a flame-retardant group to obtain functional caprolactam, and finally introducing the flame-retardant group into a side chain of nylon 6 by utilizing ring-opening copolymerization of the functional caprolactam and caprolactam to prepare the intrinsic flame-retardant nylon material. The flame-retardant nylon material can effectively avoid the migration and loss of the flame retardant, improve the dispersity of the flame retardant and enhance the flame-retardant effect, can keep the main chain structure of the nylon 6 unchanged, reduces the influence on the inherent performance of the nylon 6, is expected to directly replace the existing nylon 6 material, and is applied to the fields of automobiles, textiles, electronics and electrics, buildings, packaging and the like. In addition, a renewable lysine resource is used for partially replacing a petroleum resource, so that the method has the advantages of resource conservation, environmental friendliness, simple process, low cost and the like.

Systems and methods for polymer sequence prediction are provided. Atomic coordinates for at least the main chain atoms of a polypeptide comprising a plurality of residues is obtained and used to encode the residues into residue feature sets. Each residue feature set comprises, for the respective residue and for each neighboring residue within a nearest neighbor cutoff, an indication of secondary structure, a relative solvent accessible surface area of backbone atoms, and cosine and sine values of backbone dihedrals; a Cα to Cα distance of each neighboring residue; and an orientation and position of each neighboring residue backbone relative to the backbone residue segment of the respective residue. A residue in the plurality of residues is identified, and the corresponding residue feature set is inputted into a neural network comprising at least 500 parameters, thus obtaining a plurality of probabilities, including a probability for each naturally occurring amino acid.

The invention discloses a modified organic silicon resin, a high-temperature-resistant coating and a preparation method thereof, the modified organic silicon resin is prepared by hydrolyzing at least two different siloxane monomers and then carrying out condensation reaction on the hydrolyzed siloxane monomers and at least one boric acid monomer, and the main chain of the organic silicon resin is of a heteroatom doped structure formed by a Si-O bond, a B-O bond and a B-O-Si bond; at 200-250 DEG C, the modified organic-inorganic high-temperature-resistant composite material is subjected to a self-crosslinking reaction. The high-temperature-resistant coating overcomes the defect that the high-temperature-resistant coating in the prior art cannot meet the high-temperature test, and avoids the defects that organic and inorganic high-temperature-resistant coatings crack, the impact resistance and hardness are not matched, the water resistance is poor, and the wear resistance is poor.

The invention provides slick water fracturing fluid as well as a preparation method and application thereof. The slick water fracturing fluid comprises chitosan, a polymer matrix, paraformaldehyde and a solvent. In the slick water fracturing fluid provided by the invention, the chitosan and the polymer are fully dissolved, and the main chains of the two polymers are physically interpenetrated and wound. In the presence of paraformaldehyde, a polymer main chain is chemically crosslinked with paraformaldehyde to form a primary network structure. Then, chitosan and molybdenum disulfide can form coordination cross-linking sites, a secondary network structure is obtained, then a multi-network structure which cannot be split is formed, and the viscosity is high; moreover, the components have good solubility in the solvent, are easy to mix on line and are relatively low in preparation cost.

The invention provides a polymer, a cross-linked anion exchange membrane and a preparation method and application thereof. According to the polymer and the cross-linked anion exchange membrane, aryl compounds, trifluoroketone compounds and N-methylpiperidone are polymerized to form a main chain, the main chain has excellent rigidity and flexibility, a quaternary ammonium salt alkenyl compound is introduced as a cross-linking agent, cross-linking is completed through heating in the membrane forming process, and the cross-linked anion exchange membrane is prepared. The quaternary ammonium salt side chain introduced into the side chain has excellent hydrophilic and hydrophobic phase separation characteristics. The polymer and the cross-linked anion exchange membrane have excellent oxidation-reduction resistance and alkali resistance, have the characteristics of stable physical and chemical properties, excellent ion flux, excellent mechanical properties (the elongation at break is greater than 60%) and simple process, and can be widely applied to the fields of hydrogen production by water electrolysis and the like.