468 results about "End-group" patented technology

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.

The invention discloses an ether polymerization inhibitor special for a butadiene extraction system and a preparation method of the ether polymerization inhibitor. The ether polymerization inhibitor comprises the following raw materials: a polymerization inhibitor intermediate, a solvent and a dispersing agent, the production process comprises the following steps: preparing a polymerization inhibitor intermediate, preparing a solvent, compounding, feeding and mixing, filtering, removing impurities and detecting. According to the method, firstly, a polymerization inhibitor 701 and diethylene glycol normal pressure etherification process is adopted, and beta-hydroxyethyl methyl ether is introduced to seal a terminal group, so that the power consumption is reduced, the generation of byproducts is inhibited, the solubility of an intermediate acetonitrile is improved to be greater than or equal to 30g / L, and the anti-interference performance is greatly enhanced; the solvent doped with a small amount of silane modified nano diatomite is prepared, impurities can be adsorbed, metal ions can be chelated, the dispersing agent can be assisted to be evenly distributed, the problems that a pure water solvent is single in function and the dispersing agent is prone to agglomeration are solved, and the polymerization inhibition efficiency and the stability of an extraction system are guaranteed.

The invention relates to the technical field of organic photoelectric materials, and particularly discloses a non-condensed ring small molecule acceptor material based on a quinonoid structure as well as a preparation method and application of the non-condensed ring small molecule acceptor material. According to the invention, easily available 1, 4-diacetyl piperazine-2, 5-diketone is used as a center, an alkyl chain and Ar are used for modification, EG is used as an end group, the non-condensed ring A-D-A '-D-A type structure acceptor material based on a quinone structure is constructed, and the general formula is shown in the specification. Wherein the PCE of the acceptor material which is modified by bithiophene and takes 2-(3-ethyl-4-oxothiazolidine-2-subunit) malononitrile as a terminal group reaches 15%. The non-condensed ring small molecule acceptor material based on the quinonoid structure is simple in synthesis process, and an effective strategy is provided for solving the problem of the overall performance of an organic solar cell.

The invention relates to a method for preparing high-molecular-weight polyethylene furandicarboxylate by a one-step method, and belongs to the technical field of bio-based polyester materials. The method comprises the following steps: weighing raw materials including 2, 5-furandicarboxylic acid, ethylene glycol, an end group regulator, a protective agent, a decarboxylation inhibitor and a catalyst, mixing and adding into a reaction container, introducing nitrogen, maintaining the pressure of the nitrogen in the reaction container to be 50-150 kPa, carrying out esterification reaction, heating and vacuumizing until the pressure is less than or equal to 50 Pa after the esterification reaction is completed, and carrying out polycondensation reaction to obtain the 2, 5-furandicarboxylic acid. And carrying out extrusion and drying so as to obtain the high-molecular-weight polyethylene furandicarboxylate, wherein the high-molecular-weight polyethylene furandicarboxylate is obtained. According to the method, the FDCA conversion rate is larger than or equal to 98%, the number-average molecular weight of the obtained product is larger than or equal to 32 kg / mol, no heavy metal residues exist, and the method is suitable for large-scale production of high-end bio-based packaging materials.

The invention discloses vinyl fluorine-containing polysiloxane and a preparation method thereof, and relates to the technical field of organic silicon materials. According to the invention, high-activity fluorine-containing potassium hydroxide silanolate is used as a catalyst to realize high-efficiency catalysis; d3F serves as a main monomer, D3Vi serves as a comonomer, deionized water is introduced for the first time to serve as a retarder, and implosion is effectively inhibited; vinyl dimethyl ethyoxyl silane is used as an end-capping reagent for the first time, end group vinylation is synchronously realized, and end group and side chain divinyl polysiloxane is prepared; through cooperation of ring-opening polymerization and condensation polymerization, the reaction process is mild and controllable, the product viscosity is controllable, the crosslinking activity is high, and the application range is remarkably widened.

The invention belongs to the technical field of high polymer material preparation, and provides a low-melting-point toughened copolyester chip and a preparation method thereof. The preparation method comprises the following steps: firstly, preparing hyperbranched polyester of which the surface is rich in carboxyl-terminated functional groups through core growth of polybasic acid alcohol and end group functionalization reaction of anhydride; the other chain extender is a linear chain extender which has a long flexible chain segment and two tail ends of which are also functionalized by carboxyl groups, and is obtained by carrying out end group esterification reaction on polyether glycol; then, in the synthesis process of the main polyester, carrying out multi-stage melt polycondensation on an aromatic dibasic acid component and a polyol component under the action of a composite catalyst system, introducing the hyperbranched polyester and a chain extender into a reaction system in the form of slurry, and covalently bonding a functional additive to a copolyester main chain through a polycondensation process, so as to obtain the hyperbranched polyester. An integrated network reinforced structure is formed, so that the copolyester chip has the characteristics of low melting point and excellent toughness.

According to the prepared MXene / C electrode material based on PAN carbonization, a nitrogen-doped carbon layer generated through polyacrylonitrile (PAN) in-situ carbonization serves as a supporting spacer to be inserted between MXene nanosheet layers, the MXene nanosheet layers are tightly bridged, the interlayer spacing of MXene is effectively enlarged, re-stacking of nanosheets is inhibited, and in the carbonization process, the MXene / C electrode material can be used for preparing the MXene / C electrode material based on PAN carbonization. Abundant mesopores and fissure holes are generated in the composite material by introducing and decomposing a sacrificial template (PMMA nanosphere), and a three-dimensional through ion transmission channel is constructed; the nitrogen-doped carbon layer not only serves as a supporting spacer to be inserted between MXene nanosheet layers, but also coats the surfaces of the MXene nanosheets,-F end groups on the surfaces of the MXene nanosheets are weakened, and C-O (H) and C-N functional groups are enriched, so that the interface wettability, the conductivity and the anti-oxidation stability of the material are improved, and the material can be widely applied to the technical field of electrochemical energy storage materials.

The invention provides polyether base oil and a preparation method and application thereof.According to the polyether base oil, a melt polycondensation method is adopted, a diester group-COO-R-COO-is introduced into a molecular structure through hydroxyl groups at the two ends of polyalkylene oxide, a polyether ester molecular chain with ether bonds and diester bonds distributed alternately is formed, and the polyether base oil is prepared. Then, carboxyl at the end group of a molecular chain is further subjected to an end-capping reaction with an amine compound, a unique amine double-end-capped polyether ester structure is obtained, and the polyether base oil has excellent viscosity-temperature performance, oxidation resistance, anti-rust performance and anti-wear and anti-friction performance.

The invention provides isosorbide-based copolyester as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. According to the preparation method, a step-by-step esterification method is adopted, firstly, isosorbide, excessive aromatic dicarboxylic acid and an acylating agent are subjected to a first esterification reaction, so that the acylating agent can efficiently and specifically activate secondary hydroxyl of isosorbide, and the initial esterification rate of isosorbide is greatly increased. Meanwhile, the excessive aromatic dicarboxylic acid ensures that the generated isosorbide prepolymer takes carboxyl as a terminal group, so that isosorbide molecules are'locked 'in the middle of a polymer chain segment. Due to the fact that the isosorbide is embedded in the middle of the chain segment in advance, the problem that the isosorbide falls off in the ester exchange reaction due to the fact that the isosorbide is located at the chain end and low in reaction activity in the subsequent polycondensation stage is effectively solved, and therefore the retention rate of the isosorbide in the final polymer is greatly increased, and the glass-transition temperature of the isosorbide is greatly increased.

The invention relates to the technical field of manufacturing of fusible polytetrafluoroethylene resin, in particular to a method for treating an unstable terminal group of fusible polytetrafluoroethylene, which is used for solving the problem that the unstable terminal group cannot be thoroughly treated in the prior art. The method comprises the following steps: heating fusible polytetrafluoroethylene resin to a molten state, after self-reaction, introducing high-purity fluorine-nitrogen mixed gas to carry out fluoridation reaction, and extracting impurities generated by the reaction to obtain unstable soluble polytetrafluoroethylene resin with a treated terminal group; according to the method, soluble polytetrafluoroethylene resin is heated to a molten state, and unstable terminal groups are thoroughly treated through self-reaction and fluorination reaction.

The invention belongs to the field of high polymer material synthesis, and provides a method for preparing polyphenylene sulfide from high-purity p-dichlorobenzene, which adopts the whole process design of pre-construction of a composite sulfur source intermediate, regulation and control of an end group controllable oligomerization polyphenylene sulfide intermediate, segmented polymerization of the high-purity p-dichlorobenzene and precise dehydration-washing-drying. The ultra-low impurity level of 0.05-0.25 wt% of burning residues of the polyphenylene sulfide product, the sodium ion content of 10-200 mg / kg and the chloride ion content of 10-500 mg / kg is achieved, and meanwhile the high-performance stability of the melting point of 270-300 DEG C, the gel fraction of 92-99 wt% and the water content of 0.01-0.20 wt% is kept. The problems of deep removal of inorganic ions and ash content, balance of gel fraction and processability and control of residual solvents in the traditional polyphenylene sulfide preparation process are solved, and the method has wide application value in the fields of high-performance engineering plastics, special fibers, electronic packaging materials and the like.

The invention discloses a preparation method of a PNLC film and application of the PNLC film in an automobile intelligent dimming awning, and belongs to the technical field of liquid crystal materials for intelligent awning glass and preparation of the liquid crystal materials. The problems that an existing automobile intelligent dimming awning cannot meet the rapid dimming requirement and is poor in reliability and durability and the like are solved. A bifunctional liquid crystal monomer RM82 and a nematic liquid crystal E7 are compounded, acrylate end group polymerization of the RM82 is realized under the initiation of ultraviolet light, meanwhile, a biphenyl core structure and E7 can form a strong pi-pi conjugation effect, a phase separation energy barrier of the PNLC film is remarkably reduced, GQDs serve as a scattering enhancer, the PNLC film is endowed with a dynamic luminescence capability by utilizing the fluorescence characteristic of the GQDs, and the PNLC film has a good application prospect. The orientation of liquid crystal molecules is regulated and controlled through an electric field or temperature, the light scattering state is changed, switching of light transmitting, light scattering and light emitting is achieved, and the starry sky effect is simulated.

The invention belongs to the field of polymer coatings, and provides an aliphatic polyurethane finish paint with high adhesion resistance and a preparation method thereof. According to the invention, a polyurethane phase and a polyacrylate network are adopted to construct a semi-interpenetrating network structure, cyclic carbonate and hydrolyzable silane end groups are introduced into double-end functionalized polysiloxane, and a silicon-oxygen network surface layer is self-assembled after coating and curing; the high crosslinking density with the gel fraction being greater than or equal to 85%, the wear-resistant and anti-slip performance with the dry friction coefficient being greater than or equal to 0.50 and the abrasion mass loss being less than or equal to 0.030 g / 500 r, the ultra-low surface energy anti-dirt performance with the water contact angle being greater than or equal to 105 degrees and the surface free energy being less than or equal to 22 mN / m and the environment-friendly characteristic that the volatile organic compound content is less than or equal to 50 g / L are achieved; the three technical contradictions of high gel fraction and ultralow surface energy silica surface layer coupling, high hardness wear resistance and high friction coefficient maintenance, and high solid content and low volatility organic compound processing window and nano gradient silica surface layer construction are solved, and the nano gradient silica coating has wide application value in the field of industrial terraces and metal base material coatings.

The invention discloses a flame-retardant nylon material which comprises 50-70 parts of PA (polyamide), 1-5 parts of a toughening agent, 3-5 parts of a P-series flame retardant, 3-5 parts of an N-series flame retardant and 10-20 parts of a modified polysilsesquioxane flame retardant, and the modified polysilsesquioxane flame retardant is prepared from raw materials including silsesquioxane A, a compound B and a catalyst in an alkaline environment. The silsesquioxane A comprises at least one epoxy group D, and the compound B contains a phosphorus element P and a nitrogen element N and at least comprises a halogen end group X. The flame-retardant nylon material provided by the invention is excellent in flame retardant property and dielectric property, has good processability and mechanical property, greatly improves the anti-cracking property and anti-dripping effect of the flame-retardant nylon material, and is safe and environment-friendly.

The application belongs to the technical field of polymer material adhesive, and particularly discloses a polyurethane adhesive and a preparation method thereof. The polyurethane adhesive is in the form of emulsion, the emulsion particles in the polyurethane adhesive have polyurethane long chains capped by dopamine and containing epoxy group side chains, and the polyurethane long chains have a core-shell structure with hydrophilic groups facing outward and hydrophobic groups facing inward. The above structure enables the polyurethane adhesive to fully exert the biomimetic mussel adhesion effect of dopamine and achieve strong bonding at various interfaces. The emulsion particles can not only effectively improve the stability of the emulsion, but also enable the adhesion groups of dopamine to be enriched on the surface of the emulsion particles, thereby significantly improving the adhesion effect. When the polyurethane adhesive is applied for curing, the end groups of dopamine can be coordinated and crosslinked with mild metal ions, thereby exerting bonding strength, and the dopamine capping can completely eliminate the -NCO groups in the traditional polyurethane adhesive, thereby overcoming the disadvantage of insufficient strength.

The invention discloses an alkyl magnesium reagent-based active anionic polymerization initiation system and a polymerization method, and belongs to the technical field of polymer synthesis. A novel initiation system based on an alkyl magnesium reagent is developed, controllable anionic polymerization of various electron-withdrawing monomers is realized by accurately regulating and controlling reaction conditions and alkyl magnesium substituent structures, and a series of magnesium polymers with controllable molecular weight distribution are successfully synthesized. The polymerization process shows typical living polymerization characteristics, the block copolymer with a regular structure is prepared through a sequential feeding strategy, modification of multiple functional end groups can be achieved, and a new technical approach is provided for designing and synthesizing high polymer materials with specific performance. A novel alkyl magnesium initiating system which is low in cost and easy to operate is provided for active anionic polymerization, the limitation of a traditional initiating system is broken through, the magnesium polymer with magnesium ions at the tail end is synthesized, a new technical path is provided for controllable preparation of high polymer materials, and important theoretical significance and wide industrial application prospects are achieved.

The application belongs to the technical field of solid electrolyte membrane preparation, and provides a sulfide solid electrolyte membrane based on interface chemical bonding and multi-stage particle size self-assembly and a preparation method thereof. First, different particle size sulfide electrolyte particles are respectively subjected to differential surface functionalization treatment, so that aromatic disulfide bond structures and acylated graft layers are introduced on the surface of large particle size particles, and mercapto graft layers are introduced on the surface of small particle size particles; then, a functional crosslinking agent containing polyether chain segments, lithium sulfonate groups and thioctic acid end groups is prepared, and is compounded with the functionalized particles, butadiene rubber and ethylene-vinyl acetate copolymer to prepare a slurry, and through coating and stage type heat treatment, an interface chemical bonding network and a dynamic disulfide bond bridging structure are constructed, so that the sulfide solid electrolyte membrane with compact packing, good interface stability and ion transmission performance is obtained.

The invention relates to the technical field of natural rubber modification, in particular to a flexible long-chain chain extender as well as a preparation method and application thereof. The structural general formula of the flexible long-chain chain extender is A-[flexible chain segment]-A, wherein: the [flexible segment] is a polyether polyol chain or a polyester polyol chain having a number average molecular weight of 500 to 5000 g / mol; a is an isocyanate group or an anhydride group. The invention also provides a natural rubber flexible long chain extension modification method based on end group functionalization, which comprises the following steps: pretreating an alpha end group and / or an omega end group of natural rubber, and introducing a hydroxyl or carboxyl active group; and reacting the functionalized natural rubber with a flexible long-chain chain extender at 60-80 DEG C to realize extension and crosslinking of a molecular chain. According to the invention, the flexible long-chain chain extender is introduced, and a flexible buffer section is embedded between natural rubber molecular chains, so that the dynamic stress is effectively dispersed, and the inherent defects of the traditional rigid small-molecule chain extender are overcome.

This invention relates to the field of molecular sieves, specifically to a P-modified metal-doped MWW molecular sieve, its preparation method, and its applications. In this molecular sieve, A... Pδ‑7 / A P ≥50%, A Pδ‑7 represent 31 The peak area of ​​the P species signal peak at the terminal group with a P chemical shift of -7ppm ± 15ppm in the P MAS NMR spectrum, A P It represents 31 The peak area of ​​the total signal peak in the pMAS NMR spectrum. The molecular sieve of this invention has high activity, selectivity, and stability, and excellent resistance to carbon deposition.

In some aspects, the present disclosure provides systems for forming hydrogels that comprise a cell-adhesive polyamino compound and a reactive multi-arm polymer that comprises a plurality of hydrophilic polymer arms having reactive end groups that are reactive with amino groups of the cell-adhesive polyamino compound. In other aspects, the present disclosure provides crosslinked reaction products of a cell-adhesive polyamino compound and a reactive multi-arm polymer that comprises a plurality of hydrophilic polymer arms having reactive end groups that are reactive with amino groups of the cell-adhesive polyamino compound. In other aspects, the present disclosure pertains to methods of treatment using such systems and crosslinked products.

The present application relates to a kind of quantum dot light emitting device and its preparation method.The quantum dot light emitting layer of the quantum dot light emitting device includes three kinds of quantum dot subunits with different light emitting colors arranged in array, and three kinds of quantum dot subunits all include crosslinking copolymer, which is made by pre-polymer through crosslinking reaction, pre-polymer includes connected repeating unit (see formula I) And end group, end group contains: at least one of cyan group, hydroxyl group, sulfonic acid group, mercapto group, disulfide group, phosphorus group, amino group, carboxyl group, thiocyan group and halogen, the end group is bound together with quantum dot by coordination bond;Ar1It is big π conjugated nitrogen-containing heteroaromatic group, with excellent film-forming property and hole transport capacity, and with low LUMO energy level, can hinder the transmission of anode electron;R9It is crosslinkable group, provides crosslinking basis.The film-forming uniformity of the quantum dot of the present application is good, can maintain the high light emitting efficiency of quantum dot, promote the transmission of hole, improve the balance of carrier.

The application belongs to the technical field of gas separation membrane materials, and particularly relates to an mPEG-OH modified polyether block polyamide gas separation composite membrane and a preparation method thereof, and application of the mPEG-OH modified polyether block polyamide gas separation composite membrane in mixed gas separation. The application provides an mPEG-OH modified polyether block polyamide gas separation composite membrane and a preparation method thereof. N,N'-carbonyl diimidazole (CDI) is used to activate end groups of polyether block polyamide molecular chains, and mPEG-OH is introduced to perform end group polyether modification. On the basis of maintaining a polyether block polyamide main structure, the method can improve polyether chain segment characteristics in the material, and has an influence on chain segment packing modes and crystallization behaviors, so as to improve casting solution uniformity, membrane layer film forming quality and structure stability, and be beneficial to improving carbon dioxide separation performance of a thin film composite membrane.

The invention relates to the technical field of gelators and functional cosmetics, in particular to a porphyrin core-based gelator, preparation thereof and application of the porphyrin core-based gelator in preparation of products for removing skin glycated toxins. The gel factor provided by the invention is a C2 symmetric chiral gel factor: L-Por-Phe. A central core (porphyrin ring) of the gelator provides strong hydrophobic acting force and pi-pi stacking driving force, is not only a driving core for supramolecular self-assembly, but also is a key site for adsorbing aromatic AGEs toxins; a natural chiral source and an additional benzene ring side group are introduced into a side chain, the hydrophilic-hydrophobic balance of molecules is adjusted, and a supramolecular assembly is induced to form a single chiral spiral nanofiber; the connecting arms provide intermolecular hydrogen bonds to stabilize the three-dimensional network structure of the hydrogel; the terminal group endows the molecule with pH responsiveness, so that the gel can maintain a stable gel state in a skin physiological pH environment, and has good moisture retention.

The invention relates to an asymmetric small organic molecule photovoltaic acceptor material based on an iodo-thiophene central core as well as a preparation method and application of the asymmetric small organic molecule photovoltaic acceptor material based on the iodo-thiophene central core, and creatively designs the asymmetric small organic molecule photovoltaic acceptor material based on the iodo-thiophene central core. On the basis of keeping the efficient photoelectric property, the asymmetric iodo-thiophene central core is introduced, so that the fine regulation and control on the molecular stacking behavior and the thin film morphology are realized. The asymmetric small organic molecule photovoltaic acceptor material has good solubility in various organic solvents, molecular accumulation can be finely regulated and controlled through asymmetric central core design, intermolecular pi-pi interaction and accumulation of end groups are enhanced, more orderly-arranged and optimized charge transfer channels are formed, and the asymmetric small organic molecule photovoltaic acceptor material has a good application prospect. Therefore, the crystallinity and morphology of the film are improved.

The application discloses an MSA-MXene material and a preparation method and application thereof. The MSA-MXene material is prepared by using a MXene with an F end group as raw material through a Lewis acid molten salt assisted method, the end group, the interlayer spacing and the pore structure are co-adjusted in the molten salt process, the preparation of the high-performance MXene material is realized, and the rolling method can be used to realize the efficient and convenient preparation of the dense MXene electrode. The application provides a train of thought for solving the problem of the large-scale industrialized preparation of the MXene electrode with ultra-high performance in a limited volume.

The application belongs to the technical field of catalytic synthesis, and particularly relates to application of a Lewis acid-base pair in catalyzing polymerization of functionalizable monomers. Common polymerization methods have poor controllability for polymerization of monomers containing polyene groups, alkyne groups and conjugated diene groups, and the molecular weight of the obtained polymer is uncontrollable at low monomer conversion, and the molecular weight distribution is wide, and crosslinking occurs at high monomer conversion. The application utilizes a specific Lewis acid-base pair, and by adjusting the electronic effect and steric hindering effect of the Lewis acid and the Lewis base, active controllable polymerization of the functionalizable monomers can be catalyzed, and a polymer with a clear structure and containing functionalizable sites is obtained, the molecular weight is controllable, the molecular weight distribution is narrow, the end group structure is controllable, the position and density of the functionalizable sites are conveniently adjusted, an efficient platform is provided for post-modification preparation of functional high molecular materials, and functional high molecular materials are prepared by combining click reaction.

The invention belongs to the technical field of conductive elastomer fibers, and particularly relates to a conductive polyamide elastomer and a preparation method thereof. The conductive polyamide elastomer provided by the invention is prepared from the following raw materials: a hard-segment polymer, a soft-segment polymer, a conductive component and an auxiliary agent, the hard-segment polymer is polydodecane diacyl decamethylene diamine, the end group of the hard-segment polymer is carboxyl, the soft-segment polymer comprises aromatic ether diamine with a structure as shown in a formula 1 and amino-terminated ether diamine with a structure as shown in a formula 2, and the auxiliary agent is an auxiliary agent. The conductive component comprises a conductive filler and / or a conductive conjugated monomer, the conductive filler comprises one or more of carbon black, carbon nanotubes and graphene, and the conductive conjugated monomer comprises one or more of a bis-amino-terminated aniline polymer, ethylenedioxythiophene, aniline and pyrrole. The conductive polyamide elastomer provided by the invention does not depend on a traditional metal conductive filler, has good mechanical properties and conductivity, and is especially suitable for the fields of flexible electronic devices, intelligent sensors, conductive elastomers, thermal management materials and the like.

The invention relates to the technical field of high polymer materials, in particular to a high-flexibility polyester fluoropropylene dispersion and a preparation method thereof.The preparation method comprises the steps that linear saturated polyester diol is taken, an activating agent is added to conduct end group activating treatment on a polyester main chain, then a catalyst is added to conduct grafting treatment, and bridged polyester is obtained; introducing fluoropropylene gas into the reaction kettle of the bridged polyester, and carrying out copolymerization treatment to obtain a copolymer; cooling the copolymer to a preset value, adding a surfactant to perform coating treatment on the copolymer, and slowly adding deionized water to perform shearing treatment to obtain an aqueous dispersion; and adding tetraethoxysilane into the aqueous dispersion, and carrying out hydrolysis treatment under the condition that the pH value is 4.3-4.6, so as to obtain the high-flexibility polyester fluoropropylene dispersion. According to the invention, the elongation at break, bending tolerance and cracking resistance of the dispersion after film formation are improved, and the hidden danger of material failure under high-flexibility scenes such as flexible electronic base materials and bendable coatings is solved.

This invention relates to a method for preparing a capped polycarbonate resin, comprising the steps of: a) reacting a dihydroxy compound and a carbonate in a melt, optionally in the presence of an transesterification catalyst, thereby forming a polycarbonate in a molten phase having free hydroxyl terminal groups; and b) reacting the polycarbonate in the molten phase with a capping agent to produce a capped polycarbonate resin, wherein the capping agent comprises an anhydride, and wherein the polycarbonate in the molten phase is subjected to at least partially vacuum after being combined with the capping agent. The invention also relates to capped polycarbonate resins obtained or obtainable by this method. Furthermore, the invention relates to molding articles comprising or composed of such capped polycarbonate resins, and methods for manufacturing such molding articles.

The application discloses a fluorine-containing polymer modified single-layer graphene oxide and a preparation method thereof. The graphene oxide is exfoliated into single layers in an organic solvent under ultrasonic assistance and nitrogen protection; meanwhile, a fluorine-containing polymer or a perfluoro acid anhydride containing active reaction end groups is used as a modifier to react with oxygen-containing groups such as hydroxyl groups on the surface of the graphene oxide, so that the fluorine-containing polymer modified single-layer graphene oxide is prepared. The preparation method of the fluorine-containing polymer modified single-layer graphene oxide has the advantages of simple process, complete reaction, mild conditions, controllable product structure and the like. The obtained fluorine-containing polymer modified single-layer graphene oxide can be highly dispersed in various solvents and matrices and keep a good single-layer state, effectively overcomes the problems of easy agglomeration and difficult dispersion of existing (modified) graphene oxides, and can be widely applied to the fields of design and preparation of graphene oxide-based high-performance composite materials and the like.