3151 results about "Backbone chain" patented technology

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.

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 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 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.

The invention provides a solid-phase synthesis method of semeglutide, and belongs to the technical field of synthesis of medical intermediates, and the method specifically comprises the following steps: segmenting a semeglutide main chain into three shorter polypeptide fragments, namely a fragment 4, a fragment 5 and a fragment 2, which are 7-14 sites, 15-22 sites and 23-37 sites; and respectively synthesizing and then assembling fragments to obtain a target product. The method specifically comprises the following steps: a) synthesizing a 7-14 peptide fragment and a 15-22 peptide fragment, and assembling the 7-14 peptide fragment and the 15-22 peptide fragment into a 7-22 peptide fragment, namely a fragment 1; b) synthesizing a 23-37 peptide fragment, selectively removing a protecting group A11oc on Lys26, and connecting with a side chain to form a fragment 3; c) connecting the peptide fragment 7-22 with the peptide fragment 23-37, and removing a protecting group to obtain a crude product; and d) separating and purifying to obtain a finished product. According to the invention, the purpose of high-purity, high-yield and low-cost synthesis of the semeglutide bulk drug can be achieved.

The invention provides a molecular identity authentication system and method based on DNA origami framework layered assembly. The molecular identity authentication system comprises a disclosed skeleton chain and a plurality of shared staple chains, the shared staple chain comprises staple chains shared by three groups of single bodies and staple chains shared in pairs, and the staple chains are used as secret keys to be distributed to three participants so as to prepare the three groups of single bodies respectively, and then the three groups of single bodies are combined and spliced into a tripolymer with a dot matrix pattern, so that multi-user collaborative layered chain type assembly is realized. According to the molecular identity authentication system based on DNA origami framework layered assembly, the system combination complexity is improved to the information theory security level, so that the biological information security protection capability is improved, and brute force cracking is prevented.

The invention discloses a copolyimide film with low dielectric constant and low thermal expansion coefficient and a preparation method thereof, and the preparation method comprises the following steps: reacting 0.019-0.021 mol of aromatic dianhydride and 0.017-0.023 mol of diamine unit in 0.45-0.48 mol of solvent, then adding 0.0004 mol of end-capping reagent dissolved in 0.13-0.15 mol of solvent, and reacting to prepare polyamide acid with a main chain containing o-hydroxyl; the diamine unit comprises 10-40 mol% of a monomer with a main chain containing o-hydroxyl and the balance of aromatic diamine; performing film coating and thermal imidization on polyamide acid to prepare a polyimide film; and heating to carry out thermal rearrangement reaction on the o-hydroxyl to obtain the copolyimide film with the main chain containing the oxazole ring. The dielectric constant of the prepared copolyimide film is 2.7-3.0, and the thermal expansion coefficient of the copolyimide film is 19.5-26.5 ppm / K.

The invention discloses a hyperbranched water reducing agent for high-tensile wet joint UHPC (Ultra High Performance Concrete) as well as a preparation method and application of the hyperbranched water reducing agent, and belongs to the technical field of concrete admixtures. The preparation method comprises the following steps: mixing pentaerythritol and maleic anhydride, adding a catalyst p-toluenesulfonic acid, and carrying out an esterification reaction to prepare an esterification product; carrying out amidation reaction on the esterification product, diethanol amine and a catalyst sodium ethoxide to obtain a prepolymer; acrylic acid, maleic anhydride and the prepolymer are dissolved in deionized water, an initiator ammonium persulfate is added for a free radical copolymerization reaction, and a main chain polymer is obtained; carrying out phosphorylation reaction on the main chain polymer and phosphorus pentoxide to obtain a phosphorylated main chain polymer; the phosphorylated main chain polymer, methoxypolyethylene glycol and a catalyst p-toluenesulfonic acid are subjected to an etherification reaction, a hyperbranched comb-shaped polymer water reducing agent solution is obtained and then subjected to aftertreatment, and the water reducing agent is prepared. According to the hyperbranched comb-shaped polymer water reducing agent prepared by the preparation method disclosed by the invention, the problems of poor flowability and high viscosity of ultra-high performance concrete (UHPC) are solved by combining a linear side chain of a comb-shaped structure and a three-dimensional branch of hyperbranched topology.

The invention provides a preparation method of a high-adhesion transparent self-healing super-smooth coating. Polydimethylsiloxane is taken as a matrix, a three-arm type dynamic hydrogen bond network structure is constructed, and 2-ureido-4-pyrimidone (UPy unit) is taken as a crosslinking node to be connected with a siloxane main chain, so that the crosslinking density and the interface binding energy are remarkably improved. According to the invention, a UPy unit is innovatively introduced into a main chain or a side chain to construct two topological structures of (SUP) 2TD or (MUP) 2TD. Compared with (MUP) 2TD, the (SUP) 2TD shows excellent tensile property and self-healing property in both air and underwater environments. The enhancement of this performance is attributed to the improvement of chain displacement capability in (SUP) 2TD. Through interface dynamics, a UPy unit is guided to an interface and interacts with an interface group, and a very strong adhesion effect is obtained. In addition, the coating shows excellent self-healing performance.

The invention relates to a (methyl) acrylate monomer as well as a preparation method and application thereof, the structural general formula of the (methyl) acrylate monomer is as follows: # imgabs0 #, n is an integer of 1-20, and R1 is methyl or hydrogen; r2 and R3 are selected from hydrogen, Br, phenyl, methyl or # imgabs 1 #, wherein A1 in the # imgabs 2 # is phenyl or methyl. According to the (methyl) acrylate monomer provided by the invention, the molecular size of the whole monomer is relatively small, the whole monomer has a plurality of branched chain structures, the carbon chain length of a main chain is controllable, and the (methyl) acrylate monomer has high refractive index and good intermiscibility with other components.

The invention discloses a comb-type polyphosphate polymeric dispersant and a preparation method thereof, the dispersant is prepared by preparing a phosphate monomer from acrylate and phosphorus pentoxide, then copolymerizing the phosphate monomer with phenyl alkene or alkyl alkene, and finally adding alkali liquor for neutralization. A phosphate-polyether bifunctional side chain is introduced to a main chain, a phosphate group provides electrostatic repulsion, and a polyether group enhances steric hindrance, so that the dispersing agent can meet the requirements of strong adsorption and long-range stability at the same time, and a more durable and effective stabilizing effect is provided for a dispersion system.

The invention discloses a waterborne polyurethane high polymer material and a preparation method thereof.The preparation method comprises the steps that a polyethylene ethanol raw material and isocyanate are mixed to be subjected to prepolymerization reaction treatment, and a hydroxyl-terminated polyether prepolymer is obtained; carrying out hydrophilic modification treatment on the hydroxyl-terminated polyether prepolymer to obtain a carboxyl-containing modified prepolymer; carrying out neutralization and dispersion treatment on the carboxyl-containing modified prepolymer to obtain an ionic prepolymer emulsion; carrying out chain extension reaction treatment on the ionic prepolymer emulsion to obtain a waterborne polyurethane main chain emulsion; the waterborne polyurethane main chain emulsion is subjected to silane grafting modification treatment, and grafting modified polyurethane emulsion is obtained; and carrying out purification treatment on the grafted modified polyurethane emulsion to obtain a finished product of the waterborne polyurethane high polymer material. The stability of a finished product material is remarkably improved, and the application reliability of the waterborne polyurethane high polymer material in the fields of coatings, adhesives, textile coatings and the like is improved.

The invention discloses a bidirectional reversible conversion method and system between a peptide molecule SMILES and a sequence expression. The core innovation lies in that a new sequence description syntax is defined to retain information of a polypeptide special bond and specific modification of amino acid; a main chain atom index and adjacency traversal topology identification algorithm is adopted, and end group and topology integrated detection and coding are carried out; a residue recognition algorithm for main chain cutting and template library matching is compatible with any standard or non-standard amino acid residues, an extensible end group library / monomer template library and an automatic increment mechanism, and automatic recognition and sequence annotation of S-S disulfide bonds; the invention relates to a high-fidelity assembly algorithm of HELM anchor points and topology aware cyclic peptide processing. The method solves the problems of incapability of supporting a complex polypeptide topological structure, poor reversibility, insufficient expansibility of a monomer library and the like in the prior art, can be widely applied to scenes of quantitative structure-activity relationship model construction, large-scale polypeptide data cleaning and the like, and has remarkable practicability and innovativeness.

A high-strength PA6 composite material and a preparation method therefor, the PA6 composite material comprising, in parts by mass, 80-95 parts of caprolactam, 1-3 parts of benzoic acid and 10-30 parts of a modification additive. The benzoic acid is used for improving the tensile strength of the composite material, and the modification additive is used for enhancing the impact resistance of the composite material. Terephthalic acid and m-xylylenediamine undergo a reaction to generate m-xylylenediamine terephthalate, which is then subjected to a polycondensation reaction with caprolactam, so as to introduce same into the backbone of a PA6 molecule and modify the PA6 resin. The modified PA6 resin has remarkably improved tensile strength and impact resistance, so that the application range of the PA6 composite material can be greatly expanded.

The invention relates to the field of preparation of polyurethane damping materials, in particular to a preparation method of a repairable polyurethane damping material based on multiple hydrogen bonds and metal coordination. Compared with a traditional damping material, the damping material has a higher damping temperature range and has a good damping effect at the temperature of-20 DEG C to 60 DEG C. Multiple reversible hydrogen bonds are introduced through diamine containing amido bonds, the material is endowed with self-repairing and high mechanical strength, and damping and self-repairing performance is further enhanced through pyridine nitrogen atom metal coordination. Starting from molecular structure design, multiple hydrogen bonds and metal-ligand coordination bonds constructed on a polyurethane molecular main chain play a role in synergistic enhancement, energy can be effectively dissipated through dissociation and recombination of the multiple hydrogen bonds and fracture and association of the metal coordination bonds, and the energy consumption is reduced. The polyurethane material is endowed with excellent damping performance and self-healing capability by the dual dynamic action.

The invention discloses a dynamic borate bond-based self-healing polyacrylic acid binder and a preparation method thereof. The dynamic borate bond-based self-healing polyacrylic acid binder comprises a polymer main chain and a dynamic cross-linking agent, the dynamic cross-linking agent is a polyol compound containing at least two pairs of ortho-hydroxyl groups; the polymer main chain is formed by copolymerizing the following monomers: an acrylic structural monomer, the molar fraction of which accounts for 85-94% of the total monomer; a functional monomer containing a boric acid group, wherein the molar fraction of the functional monomer accounts for 3-8% of the total monomer; the mole fraction of the flexible monomer containing the acrylate group accounts for 3-8% of the total monomer. Various stresses generated by different negative electrode materials in circulation can be effectively adapted and buffered through a network formed by dynamic boric acid ester bonds and reversible fracture and combination of the boric acid ester bonds, so that the service life of the battery is generally prolonged, the working temperature range of the battery can be remarkably widened, the low-temperature discharge capacity can be remarkably increased, and the high-temperature cycle life can be prolonged.

The invention provides a lithium ion battery, positive electrode slurry, a dispersing agent and a preparation method of the dispersing agent, the dispersing agent comprises a multi-chain polymer composed of a polyether main chain, an aliphatic chain grafted to the polyether main chain and a polyester chain, the mass ratio of the polyether main chain to the aliphatic chain to the polyester chain in the multi-chain polymer is (40-50): (25-30): (15-20), and the mass ratio of the polyether main chain to the aliphatic chain to the polyester chain in the multi-chain polymer is (40-50): (25-30): (15-20). The molecular weight of the polyether main chain is 2500-5000, the number of carbon atoms of the aliphatic chain is 8-22, carboxyl groups are further grafted on the polyester chain, and the molecular weight of the multi-chain polymer is 30000 + / -10000. The microscopic multilevel structure of the dispersing agent is optimized, the cracking risk and interface resistance of the positive electrode active material layer are reduced, and the cycle performance of the battery is improved.

The invention provides organic silicon cooling liquid and a preparation method thereof. The molecular structural formula of the organic silicon cooling liquid is shown in the specification, R1 is selected from C3-7alkane, the value of a is 0-12, and the value of b is 14-20. A phenyl group and a long-chain alkyl side chain are introduced into a silicone oil main chain through an organic synthesis means, the regularity of a polysiloxane chain is destroyed, the crystallization property of the polysiloxane chain is reduced, the performance of the organic silicon cooling liquid is changed from the molecular structure, and the organic silicon cooling liquid can still flow at a low temperature (-65 DEG C). In addition, by introducing phenyl, the flash point, irradiation resistance and other properties of the immersed cooling liquid can be remarkably improved. # imgabs0 #

The invention discloses a crown ether grafted polyarylether sulfone ion separation membrane as well as a preparation method and application thereof, and belongs to the technical field of ion separation membranes, collaborative optimization is realized through crown ether accurate grafting and ultrathin ordered membrane formation: a main chain of polyarylether sulfone is grafted with 4 '-aminobenzo-12-crown-4 to form an inherent channel adapted to Li, and the specific surface area of the main chain is increased; the ultrathin film is prepared by a water surface spreading method, and the ion transmission path is shortened. Finally, in a LiCl / MgCl system, Liion flux has high selectivity, high permeation-high selectivity cooperation is preliminarily realized, the chemical synthesis step can be amplified to a kilogram level, and after a DPAES-g-CE / dichloromethane solution is dropwise added to the water surface, the DPAES-g-CE / dichloromethane solution is rapidly spread to form a film without precise equipment; the raw materials are industrial-grade monomers and have no toxic residues, the membrane can be recycled and reused through dichloromethane, the equipment cost is reduced by about 90%, and industrialization is easy; the main chain of the polyaryl ether sulfone is high in rigidity and resistant to high temperature and chemical corrosion; crown ether grafting avoids molecular chain agglomeration, and the swelling rate is far lower than that of a traditional sulfonated membrane.

The invention relates to a composite binder, an electrolyte membrane, a preparation method and a battery. The composite binder comprises a binder main material and cross-linked molecules, the binder main material has a first functional group; the cross-linked molecule comprises a main chain and second functional groups, the main chain comprises a dynamic cross-linked structure sensitive to heat, the dynamic cross-linked structure comprises at least one of reversible chemical bonds and heat-sensitive functional groups, and the two ends of the main chain are provided with the second functional groups which are combined with the first functional groups in a reaction mode. The problem of poor mechanical property of the binder in the related art can be solved.

The invention discloses a durable low-surface-energy polymer modifier capable of freezing on the surface of a matrix and a preparation method thereof, the main chain of the durable low-surface-energy polymer modifier comprises a polydentate hydrogen bond monomer structure, and the end group of the polymer chain is a fluorinated structure. The durable low-surface-energy polymer modifier disclosed by the invention is co-mixed with matrix resin through a conventional processing and mixing means in a standard production process, and is migrated to the surface of a material in processing, heat treatment and use processes, so that the durable low-surface-energy polymer modifier can achieve multiple effects of water resistance, pollution resistance, dust prevention, anticoagulation, antithrombosis, antibiosis, self-cleaning and the like; the multidentate hydrogen bond monomer structure in the modifier structure realizes freezing of the modifier on the surface of matrix resin, so that the risk of elution and loss of the modifier is effectively reduced, the possibility of migration, washing or dissolution in blood is reduced, and the low surface energy durability effect of the matrix surface is enhanced.

The invention discloses a preparation method of a grafted and substituted thiophene polymer material, which comprises the following steps: mixing poly (3-hexylthiophene), a grafting monomer, a catalyst and an auxiliary agent, and heating for reaction to obtain the grafted and substituted thiophene polymer material, the structural formula of the grafting monomer is as shown in formula (I); wherein B is fluorine, chlorine, bromine or iodine, A is a carbon atom or a nitrogen atom, and R is cyano, formyl, methoxycarbonyl or; according to the method, pre-synthesis of complex functional monomers is avoided, the main chain of the poly (3-hexylthiophene) can be directly modified without using an expensive catalyst or ligand, the polymerization reaction of the poly (3-hexylthiophene) is not interfered, and meanwhile, the method has the advantages of simplified steps and low cost.

The invention discloses a halogen-free flame-retardant benzoxazine-epoxy / aramid fiber composite material and a preparation method thereof, and belongs to the technical field of polymer composite materials. The composite material is obtained by heating and curing main chain type phosphorus-containing benzoxazine, epoxy resin and aramid fiber according to the mass fraction ratio of (1%-50%): (40%-70%): (30%-70%); the main chain type phosphorus-containing benzoxazine is prepared by carrying out Mannich condensation reaction on phosphorus-containing diamine, bisphenol and paraformaldehyde according to the molar ratio of 1: 1: (4.1-4.4). According to the prepared composite material, main chain type phosphorus-containing benzoxazine modified epoxy resin serves as a matrix, the matrix and aramid fibers are subjected to heating curing to prepare the composite material, benzoxazine is crosslinked with the aramid fibers and the epoxy resin when subjected to ring opening polymerization, the interface bonding performance between the aramid fibers and the epoxy resin can be remarkably improved, and the composite material can be used for preparing the aramid fibers and the epoxy resin. The mechanical property of the composite material can be effectively improved; meanwhile, benzoxazine contains phosphorus, so that the flame retardant property of the composite material can be improved, and the application field of the aramid fiber composite material is expanded.

The invention discloses a binder system with an electron and ion conduction function and application thereof. The binder system comprises 1) a cross-linking agent containing an ethyoxyl unit and 2) a polymer with electron conduction or electron and ion conduction functions, and the cross-linking agent and the polymer respectively have groups which are cross-linked under light and / or heat conditions; when in use, light and / or heat are utilized to initiate a cross-linking reaction, so that the polymer is cross-linked in situ by the cross-linking agent, and a three-dimensional binder network structure for ion and electron transmission is formed. According to the binder system disclosed by the invention, the polymer is subjected to in-situ crosslinking by utilizing the cross-linking agent to form a three-dimensional binder network structure, the polymer is used as a conjugated main chain for providing electron transmission, and the cross-linking agent is used as a flexible cross-linking chain segment beneficial to ion diffusion, so that the mechanical property of the binder is improved to the greatest extent while the high adhesive force of the binder is ensured; enough mechanical properties are provided for a battery pole piece to maintain the integrity of an electrode, so that the cycling stability of the high-specific-capacity negative electrode material is improved.