2037 results about "Glass transition" patented technology

The invention discloses supercritical fluid foaming polyimide wave-absorbing foam and a preparation method thereof.The thermoplastic polyimide is prepared by the steps that aromatic dianhydride, aromatic diamine and aliphatic diamine serve as comonomers, polyimide acid is generated through solution polymerization, and then high-temperature cyclization is conducted; wherein the mole number of the aliphatic diamine accounts for 10-50% of the total mole number of the diamine, and the free volume and glass transition temperature of a molecular chain are effectively regulated and controlled by introduction of the aliphatic diamine; the wave-absorbing foam is prepared by taking polyimide as a matrix, doping 1-20wt% of wave-absorbing filler, and foaming for 1-3 hours in a supercritical carbon dioxide or nitrogen environment at the temperature of 180-220 DEG C and the pressure of 9-25MPa, through molecular structure design, the adsorption capacity and impact resistance of polyimide to carbon dioxide are remarkably improved, and the prepared foam has the advantages of light weight, high porosity, uniform foam structure and excellent heat resistance, can realize effective electromagnetic wave absorption in an X wave band, and is suitable for the fields of aerospace stealth and electromagnetic compatibility protection.

The invention relates to the field of polyester materials, and particularly discloses modified polyester with low yellowness value and high glass transition temperature characteristics and a preparation method thereof, and the modified polyester is prepared by taking terephthalic acid, diphenyldicarboxylic acid and fluorenyl aromatic dicarboxylic acid as carboxylic acid monomers, respectively esterifying with ethylene glycol, and carrying out co-polycondensation on corresponding esterification products. According to the present invention, the biphenyldicarboxylic acid with the conjugated aromatic ring structure and the fluorenyl aromatic dicarboxylic acid monomer are selectively introduced to modify the PET, such that the regularity of the polyester chain segment is broken so as to ensure the optical performance of the polyester; the movement of a polyester chain segment is limited so as to improve the Tg value of polyester; and by matching with a novel preparation method, the yellowness value of the polyester material is reduced.

The invention discloses a preparation method of a high-temperature-resistant high-strength polyimide composite material, and relates to the technical field of polyimide composites.The preparation method comprises the following preparation steps that S1, a customized silane coupling agent is prepared; s2, preparing a bionic dynamic interface modified reinforcing filler, wherein the modified reinforcing filler is synergistically modified through a bionic coating and a customized silane coupling agent; and S3, preparing a polyimide precursor solution containing the dynamic network. According to the preparation method of the high-temperature-resistant high-strength polyimide composite material, through the integrated design of'customized silane coupling agent + bionic dynamic interface modification + dynamic network-containing polyimide precursor + gradient hot-pressing curing ', the glass-transition temperature of the prepared composite material is greater than or equal to 335 DEG C, the tensile strength is greater than or equal to 208 MPa, and meanwhile, the thermal repair efficiency at 180-250 DEG C is greater than or equal to 87%; the technical bottleneck that high temperature resistance, mechanical strength and repairing performance of the material are difficult to consider at the same time in the prior art is solved.

The present invention relates to an elastomeric laminate comprising at least two adjacent layers, wherein: the rubber composition constituting the first layer is based on 20 phr to 100 phr of at least one copolymer comprising ethylene units and 1,3-diene units of formula CH2=CR-CH=CH2, the ethylene units in the copolymer representing more than 50 mol% of the copolymer monomer units, and the symbol R represents a hydrocarbon chain having 3 to 20 carbon atoms, 0 phr to 80 phr of at least one diene elastomer having a diene unit weight concentration greater than 50%, 10 phr to 100 phr of a plasticizing system comprising at least one plasticizing resin having a glass transition temperature higher than 20°C and / or at least one plasticizer which is liquid at 23°C, and a reinforcing filler, and a crosslinking system; the rubber composition constituting the second layer is based on a diene elastomer having a diene unit weight concentration greater than 50% and a crosslinking system. The present invention also relates to a rubber article, in particular a pneumatic or non-pneumatic tire, comprising such a laminate.

The invention provides a carbazole-containing heterocyclic compound and an organic electroluminescent device thereof, and relates to the technical field of organic electroluminescent materials. The carbazole-containing heterocyclic compound provided by the invention has relatively high polarizability, is beneficial to improving the refractive index, and can reduce the total reflection phenomenon during light emission of the device and effectively improve the light extraction efficiency of the device when being applied to a covering layer of the organic electroluminescent device; and meanwhile, the compound has relatively high glass transition temperature and good film-forming property, and can isolate moisture and oxygen, so that the luminous efficiency and the service life of the organic electroluminescent device are further improved and prolonged. The preparation method of the compound is simple, raw materials are easy to obtain, and the compound can be widely applied to the fields of organic thin film transistors, panel display and the like and has good application effects and industrialization prospects.

The invention relates to the technical field of electronic packaging materials, in particular to a phthalonitrile modified thermosetting resin composition containing a siloxane structure and application of the phthalonitrile modified thermosetting resin composition in the electronic packaging materials. The composition comprises multifunctional epoxy resin, XYLOK phenolic resin, a curing accelerator, a modifier and an inorganic filler, and the modifying agent is eugenol phthalonitrile trisiloxane. The modifier disclosed by the invention has good mechanical compatibility and dispersity in matrix resin; when the epoxy resin is applied to a thermosetting resin system, the processability can be improved, and the toughness of a cured product can be effectively improved while the glass-transition temperature is increased, so that the cured product has excellent bending property; the composition has excellent thermal stability, low bending modulus, good impact performance and humidity and heat resistance after being cured, the glass transition temperature of the composition is effectively improved, the comprehensive performance of resin is remarkably improved, and the composition is suitable for improving the packaging reliability and environmental stability of semiconductor devices.

The invention relates to the technical field of preparation of high-moisture-absorption warm-keeping anti-wrinkle flexible cloth, in particular to high-moisture-absorption warm-keeping anti-wrinkle flexible cloth and a preparation process thereof.According to the designed moisture-absorption skin-friendly layer, alkali decrement treatment and silane coupling agent grafting treatment are combined, and the natural antibacterial property of coffee grounds is reserved; the shape memory polymer fibers of the anti-wrinkle layer deform when the temperature is larger than or equal to the glass transition temperature, the shape is fixed after cooling, a nanometer adhesive is melted in the hot pressing process to fill gaps of a framework, and the elastic recovery rate after repeated folding is far higher than 85%. The high porosity and low heat conductivity coefficient of aerogel fibers of the warm-keeping layer are combined with the heat storage and temperature regulation functions of phase change microcapsules, so that the air permeability of the warm-keeping layer is remarkably improved; all the layers are chemically bonded through plasmas to form covalent bond combination, so that the phenomenon of layering after multiple times of water washing or bending is effectively avoided.

The present inventions concerns a copolymer of ethylene and an C3 to C8 alpha-olefin, wherein the copolymer has a density of 870 to 890 kg / m3 measured according to ISO 1183, a MFR2 of 0.5 to 8.0 g / 10 min measured according to ISO 1133, wherein the alpha-olefin is present in the copolymer in an amount of 20 to 35 wt.-%, wherein the copolymer has a first melting temperature Tm1 measured according to ISO 11357-3, characterized in that the first melt point Tm1 is between 90 and 115° C.

The invention relates to the technical field of electronic packaging materials, in particular to a thermosetting resin composition for packaging a high-reliability semiconductor device. The composition comprises multifunctional epoxy resin, XYLOK phenolic resin, a curing accelerator, a modifier and an inorganic filler, and the modifying agent is eugenol phthalonitrile polysiloxane. The modifier has good mechanical compatibility and dispersity in matrix resin; and when being applied to a thermosetting resin system, the epoxy resin can improve the processability and effectively enhance the toughness of a cured product. The composition provided by the invention accords with the processing and forming process of the existing epoxy molding compound; according to the present invention, the spiral flow length of the molding compound is substantially increased, the processing performance is good, the cured product has advantages of good thermal stability, low bending modulus, good impact property and good heat and humidity resistance, and the glass transition temperature is increased. The resin is significantly improved in comprehensive performance, and is suitable for packaging semiconductor devices with high requirements on reliability and environmental stability.

The invention relates to the technical field of lubricating oil, and discloses a low-temperature-resistant lubricating oil composition and a preparation method thereof. Mineral oil, modified polymethacrylate, a dispersing agent, an antioxidant and an oil defoaming agent are stirred and mixed and then filtered, and the low-temperature-resistant lubricating oil composition is obtained. The cross-linking agent enables polymethacrylate to form a light cross-linked structure, and stress can be dispersed during shearing; nitrogen atoms in triazinyl, pyridyl, pyrrolidone and Mannich base structures serve as hydrogen bond receptors, the hydrogen bond interaction with hydroxyl on a polymethacrylate molecular chain is enhanced, a physical cross-linked network is formed, and the shear resistance is further improved; in the modified low-temperature-resistant monomer, the glass-transition temperature can be remarkably reduced by high flexibility of silicon oxygen bonds in long straight-chain alkyl and silane groups, so that a molecular chain can still move at a low temperature, and the low-temperature fluidity of the lubricating oil is improved; the cyclic structure of cyclohexyl can effectively interfere with the ordered arrangement of wax crystals, reduce the pour point of the lubricating oil and improve the low-temperature fluidity.

The invention relates to a composite current collector and a lithium battery. The composite current collector comprises a metal layer, a supporting layer and an adjusting layer arranged between the metal layer and the supporting layer, the adjusting layer comprises matrix resin, and the glass transition temperature Tg of the matrix resin is less than or equal to 70 DEG C, so that the adjusting layer has excellent flexibility and deformability, can effectively absorb and buffer internal stress generated by thermal expansion coefficient difference of metal and polymer, and prevents interface stripping caused by stress concentration, thereby greatly improving the durability of the binding force. By limiting the number of carbon atoms of a molecular main chain in a range of 12-700, the flexibility and cohesion strength of the adjustment layer can be balanced, so that stress can be buffered, the adjustment layer can serve as a firm whole, the binding force of the metal layer and the polymer layer is further improved, interface separation is avoided, the cycle life of the lithium battery is prolonged, and the use safety of the lithium battery is improved.

The invention belongs to the technical field of organic electroluminescence, and particularly provides an electroluminescent material and an organic electroluminescent device comprising the same, the electroluminescent material comprises a combination of a first organic compound and a second organic compound, the first organic compound has a structure as shown in a formula I, and the second organic compound has a structure as shown in a formula II; the second organic compound has a structure as shown in a formula II; through structural design of the first organic compound and the second organic compound, particularly introduction of a substituent group at a specific site, and synergistic compounding of the two organic compounds, the material has higher glass transition temperature Tg and excellent thermal stability while having excellent photoelectric properties and carrier transport properties. The electroluminescent material is used for the organic electroluminescent device, is especially suitable for a luminescent layer, and can effectively ensure the uniformity of a deposited film, so that the thermal stability of the device is excellent, and the high-temperature test life is remarkably prolonged.

The invention discloses composite epoxy resin resistant to damp-heat aging and a preparation method and application thereof, and belongs to the technical field of electrical equipment insulating materials. The composite epoxy resin is prepared by the following steps: preparing an epoxy resin mixture from bisphenol A diglycidyl ether type epoxy resin and N, N, N ', N'-tetraepoxypropyl-4, 4 '-diaminodiphenylmethane according to a mass ratio of (1.5-4): 1, and reacting the epoxy resin mixture with a methylhexahydrophthalic anhydride curing agent with a specific molar ratio and a 2, 4, 6-tri (dimethylaminomethyl) phenol accelerant with a certain amount. Through collaborative optimization of the components and the process, the glass-transition temperature, bending strength and breakdown field strength of the epoxy resin are remarkably improved, and the dielectric loss is effectively reduced, so that the epoxy resin shows excellent thermal stability, mechanical property retention rate and insulation reliability in a high-temperature and high-humidity environment; the method is especially suitable for manufacturing insulation parts of electrical equipment in coastal and other high-humidity areas.

The invention belongs to the field of adhesives, and relates to an acrylate-siloxane modified polyurethane adhesive as well as a preparation method and application thereof. The acrylate-siloxane modified polyurethane adhesive contains a silane modified polyurethane prepolymer, an acrylate compound, a photoinitiator and an optional rheology modifier, wherein the silane modified polyurethane prepolymer, the acrylate compound, the photoinitiator and the optional rheology modifier are used as raw materials; the silane modified polyurethane prepolymer is prepared by the following steps: firstly, carrying out addition polymerization reaction on a polyisocyanate compound and a low-viscosity polyol compound, and then carrying out addition reaction on the obtained polyurethane prepolymer and a silane coupling agent containing reactive hydrogen. The low-viscosity polyol compound has a glass transition temperature of 0 DEG C or less and a melting point of 40 DEG C or less; the functionality of at least a portion of the acrylate compound is bifunctional or less, and the glass transition temperature is 20 DEG C or more. The acrylate-siloxane modified polyurethane adhesive provided by the invention has the characteristics of low viscosity, no bubble and high curing speed.

The invention discloses an ultrasonic-annular water cooling synergetic thermosetting composite material repairing method and equipment, on the basis of coaxial annular water cooling, an annular cooling cavity with a variable contour and a structural design of a closed ring with a plane contour which can be circular, elliptical, waist-circular or polygonal are introduced, so that the inner side contour of a cooling ring can be more attached to a welding area. For a large-size or irregularly-shaped thermosetting matrix component repaired by adopting ultrasonic local fusion welding, the cooling zone can be tightly attached to the outline of a welding interface in the circumferential direction through the design, heat is effectively prevented from overflowing along a complex boundary, compared with a fixed circular or linear cooling structure, the range of a heat affected zone can be further narrowed, and the service life of the component is prolonged. And a high-temperature area in the thermosetting matrix is more limited near a welding interface, so that the overall temperature of the thermosetting matrix is always lower than the glass-transition temperature while sufficient melting and flowing of the thermoplastic patch are ensured, and resin degradation and interface strength attenuation caused by local overheating are avoided.

The invention belongs to the technical field of insulating materials of high-voltage direct-current power transmission equipment, and discloses a pure epoxy crosslinking system and a preparation method and application thereof.The preparation method comprises the steps that fluorenyl bisphenol, epoxy chloropropane, a phase transfer catalyst and an alkaline solution are mixed to obtain a mixture, the mixture is subjected to impurity removal to obtain fluorenyl epoxy resin DGEBF, and the fluorenyl epoxy resin DGEBF is subjected to high-voltage direct-current power transmission equipment insulating materials. The preparation method comprises the following steps: uniformly mixing fluorene group epoxy resin DGEBF and an anhydride curing agent MTHPA, and then carrying out curing reaction to obtain a pure epoxy crosslinking system; according to the invention, the epoxy resin can have higher glass transition temperature and thermal decomposition temperature, the mechanical strength, modulus and dimensional stability of the material are improved, and good electrical insulation performance can still be maintained in a high-temperature environment.

The invention relates to the technical field of resin composite materials, in particular to a layer-adding adhesive film for an FC-BGA packaging carrier plate, a preparation method of the layer-adding adhesive film and an adhesive-coated copper foil. The layer-adding adhesive film is prepared from the following raw materials in parts by mass: 50 to 60 parts of epoxy resin, 180 to 200 parts of inorganic filler, 30 to 36 parts of curing agent, 4 to 6 parts of modified phenoxy resin, 3 to 5 parts of carbodiimide resin and 0.2 to 0.4 part of 4-dimethylaminopyridine. Modified phenoxy resin and carbodiimide resin are added on the basis of main components such as epoxy resin, inorganic filler and a curing agent, meanwhile, 4-dimethylaminopyridine is used as a curing accelerator, and through the synergistic effect of all the components, the dielectric loss angle tangent of a layer-adding adhesive film can be effectively reduced, the glass-transition temperature of a layer-adding adhesive layer is increased, and the bonding strength of the layer-adding adhesive film is improved. Good flame retardance of the layer-adding adhesive film is ensured, and the layer-adding adhesive film is applied to the adhesive-coated copper foil.

The present invention belongs to the technical field of coatings, and in particular discloses a vinyl epoxy siloxane modified acrylic resin and a preparation method therefor. The vinyl epoxy siloxane modified acrylic resin is a vinyl epoxy polysiloxane graft-modified acrylic resin synthesized by using styrene, an acrylate monomer with a specific composition, vinyltriisopropoxysilane, etc., as comonomers, producing a copolymer therefrom under the action of an initiator, and then grafting epoxy siloxane thereto by means of a chemical synthesis modification method. By means of a copolymerization reaction and grafting modification, the molecular chains of the resin are endowed with a relatively large number of silane branches and an appropriate amount of epoxy groups and silane groups, which are uniformly distributed, thereby increasing the glass transition temperature of the resin. Also disclosed in the present invention are a weather-resistant topcoat based on the vinyl epoxy siloxane modified acrylic resin, and a preparation method therefor. The relatively high glass transition temperature of the vinyl epoxy siloxane modified acrylic resin ensures that the weather-resistant topcoat has good self-drying performance and medium resistance.

The invention provides a carbazole ring-containing compound and an organic electroluminescent device thereof, and relates to the technical field of organic electroluminescent materials. The carbazole ring-containing compound provided by the invention has relatively high glass transition temperature and molecular thermal stability, and has a proper HOMO energy level, so that the distribution of electrons and holes in a luminescent layer is more balanced, and the recombination efficiency of excitons in the luminescent layer is improved; when the compound is applied to a light-emitting layer of an organic light-emitting device, the light-emitting efficiency and the service life of the device can be effectively improved. Meanwhile, the preparation method of the compound is simple, raw materials are easy to obtain, and the compound can be widely applied to the fields of organic thin film transistors, panel display and the like and has good application effects and industrialization prospects.

Embodiments are directed to a polyolefin elastomer comprising a polymerized reaction product of 50 mol% to 99.5 mol% ethylene and 0.5 mol% to 40 mol% cyclic olefin. The polyolefin elastomer comprises a glass transition temperature of -30 °C to 30 °C, as measured according to Differential Scanning Calorimetry and a weight average molecular weight of 50,000 g / mol to 500,000 g / mol, as measured according to conventional Gel Permeation Chromatography. Further embodiments are directed to laminates comprising the polyolefin elastomer.

The invention relates to the field of solar silicon wafer cutting, in particular to a plastic plate and a preparation method and application thereof. The plastic plate is prepared from the following components in parts by weight: 30 to 48 parts of high glass transition temperature resin, 49 to 68 parts of polycarbonate resin, 1 to 5 parts of lubricant, 0.2 to 0.4 part of antioxidant and 0.05 to 0.25 part of plasticizer, wherein the glass transition temperature of the high glass transition temperature resin is 100-400 DEG C; the lubricant comprises silane coupling agent modified silicon powder. According to the plastic plate, the yield of silicon wafer cutting can be improved, the abrasion of the steel wire is reduced, and the service life of the steel wire is prolonged; and meanwhile, cutting heat can be reduced, and the cutting stability is improved.

A glass is an amorphous oxide glass. An SiO2 content ranges from 56 mol % to 80 mol %, an Li2O content is 2.00 mol % or less, a B2O3 content ranges from 0 mol % to 4 mol %, a total content of MgO and CaO (MgO+CaO) ranges from 9 mol % to 40 mol %, and the oxide glass has a specific gravity of 2.75 g / cm3 or less, and a glass transition temperature of 650° C. or higher.

The invention provides a preparation method of a high-heat-resistance prepreg of a thick copper multilayer board, which comprises the following steps of: acquiring real-time sequences of storage modulus and loss modulus of resin on line, filtering and normalizing, extracting typical rheological response characteristics, and combining temperature feedback correction and inversion of resin conversion rate and glass-transition temperature to realize accurate identification of process deviation, so as to obtain the high-heat-resistance prepreg of the thick copper multilayer board. According to the method, closed-loop control over the pre-curing process can be effectively achieved, the curing degree consistency and the process self-adaption capacity of prepregs are improved, historical process memory and model parameter optimization are supported, and the long-term production stability and the product quality are improved.

The invention relates to the technical field of material science and engineering, in particular to an amorphous alloy high-temperature rheological behavior prediction method, which comprises the following steps: acquiring multi-scale characteristic parameters of an amorphous alloy under a high-temperature condition, and constructing a viscoelastic constitutive model coupled with beta relaxation intensity and free volume evolution based on the multi-scale characteristic parameters; obtaining structure evolution data under different energy states, and correcting the viscoelastic constitutive model based on the structure evolution data; combining the corrected viscoelastic constitutive model with a machine learning algorithm, and generating a high-temperature rheological behavior prediction model through training; and based on the high-temperature rheological behavior prediction model, outputting a rheological stress value of the amorphous alloy under target temperature and stress conditions, and when the target temperature is higher than the glass transition temperature, introducing a viscous flow correction term into the viscoelastic constitutive model. According to the method, accurate and widely-applicable amorphous alloy high-temperature rheology prediction is realized by obtaining multi-scale parameters, constructing a coupling model, combining experimental correction and a neural network and verifying covered double-temperature zones.

The invention provides toughened epoxy resin for a carbon fiber epoxy prepreg and a preparation method of the toughened epoxy resin, and relates to the technical field of high polymer material preparation. The preparation method comprises the steps of aminating phenyl polymethylsiloxane, modifying epoxy resin and preparing toughened epoxy resin. And aminating phenyl polymethylsiloxane: mixing phenyl trimethoxy silane, 3-aminopropyltriethoxysilane and a diluent, dropwise adding a catalyst, and adjusting the pH value after a reaction to obtain the amino-containing phenyl polymethylsiloxane. The epoxy resin is modified, wherein phenyl polymethylsiloxane containing amino groups and polyhedral oligomeric silsesquioxane are used as modifiers. And preparing toughened epoxy resin: mixing the modified epoxy resin, solid epoxy resin, a diluent, a curing agent and a flame retardant. The toughened epoxy resin prepared by the invention maintains a high glass transition temperature while toughening, and optimizes the interlaminar shear strength and flexural modulus of the carbon fiber epoxy prepreg.

The invention discloses a relaxation annealing method for improving magnetocaloric performance of rare earth-based amorphous alloy, and relates to the technical field of amorphous alloy materials.The relaxation annealing method comprises the steps that the rare earth-based amorphous alloy prepared through rapid quenching and solidification is heated to the annealing temperature and subjected to heat preservation, and after annealing time, the high-magnetic-entropy-change rare earth-based amorphous alloy is obtained through cooling. The annealing temperature ranges from 0.8 Tg to 0.97 Tg, the annealing time ranges from 1 h to 9 h, and Tg is the glass transition temperature of the rare earth-based amorphous alloy. The invention further discloses the rare-earth-based amorphous alloy obtained through the relaxation annealing method and application of the rare-earth-based amorphous alloy in a liquid helium magnetic refrigeration device. According to the method disclosed by the invention, the magnetocaloric performance of the rare-earth-based amorphous alloy can be effectively improved, and a new technical path is provided for regulating and controlling the magnetocaloric performance of the rare-earth-based amorphous alloy.

The invention discloses a wide vermicelli production control system with a safety monitoring function, and relates to the technical field of automatic control, and the wide vermicelli production control system comprises an online state sensing unit which is used for collecting diffuse reflection spectrum vectors and core temperature in real time; the state estimation and prediction unit is used for receiving the diffuse reflection spectrum vector, calculating a predicted glass transition temperature, calculating a safety margin and generating a dynamic temperature set point and a core safety constraint; the dynamic optimization control unit is used for receiving the core temperature, the dynamic temperature set point and the core security constraint, and performing rolling optimization calculation according to a multi-objective optimization function to generate an optimal control instruction; and the process parameter execution unit is used for receiving the optimal control instruction and adjusting the microwave power and the vacuum degree. Through real-time product state sensing, online prediction and scientific safety boundary construction, complete self-adaptive control of the production process is realized, the drying efficiency and the product quality are cooperatively improved, and the production stability and the yield are greatly enhanced.

Disclosed is a method for manufacturing a separator having a polymer adhesive layer. The method includes preparing an aqueous polymer slurry comprising a particulate binder polymer having a glass transition temperature Tg of 20° C. or more and a particle size D50 of 300 to 800 nm, a wetting agent, and a particulate acrylic binder polymer having a glass transition temperature Tg of −10° C. or less and a particle size D50 of 100 to 200 nm, and coating the aqueous polymer slurry on at least one surface of a polyolefin-containing porous membrane having pores and drying the aqueous polymer slurry.

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.

Provided are: a water-dispersed pressure-sensitive adhesive composition that has an excellent pressure-sensitive adhesive strength, and that can achieve both of adhesiveness to an adherend and peelability; and a pressure-sensitive adhesive sheet for re-peeling using the water-dispersed pressure-sensitive adhesive composition. The water-dispersed pressure-sensitive adhesive composition includes: a water-dispersed acrylic polymer; an active energy ray-curable resin; and a photopolymerization initiator, wherein the water-dispersed acrylic polymer is a polymer having two or more glass transition temperatures.