1697 results about "Carbonate ester" patented technology

The invention relates to the technical field of polypropylene, and discloses a high-strength polypropylene composite material as well as a preparation method and application thereof in an automobile bumper. The high-strength polypropylene composite material comprises the following components in parts by weight: 70-90 parts of polypropylene resin, 10-30 parts of polycarbonate resin, 25-40 parts of glass fibers, 3-10 parts of an allyl carbonate grafted polypropylene compatilizer and the like. The compatilizer contains carbonate groups similar to polycarbonate, so that the compatibility between polypropylene resin and polycarbonate resin is improved, and the compatilizer has higher mechanical properties. Moreover, the compatilizer contains carboxyl and can form interaction with the surface of the glass fiber, so that the compatibility between the glass fiber and the polypropylene resin is improved, the glass fiber has a better reinforcing effect, the tensile strength, the impact strength and the bending strength of the composite material are remarkably improved, and the compatilizer has good practical application in the aspects of automobile bumpers and the like.

The invention provides a sodium ion battery, an energy storage device and an energy storage system. The sodium ion battery comprises a positive pole piece, a diaphragm, a negative pole piece and an electrolyte, the negative pole piece comprises a carbon material, the specific surface area of the carbon material is x, the carbon material comprises mesopores, the number percentage of the mesopores in the carbon material is y, and the electrolyte comprises an organic solvent, an electrolyte salt, an organic additive and a sodium salt additive, the organic solvent comprises cyclic carbonate and chain carbonate, the mass fraction of the cyclic carbonate in the electrolyte is a, the mass fraction of the chain carbonate in the electrolyte is b, the mass fraction of the organic additive in the electrolyte is c, and the mass fraction of the sodium salt additive in the electrolyte is d; the sodium ion battery meets the relational expression of 0.4 < = a / y < = 0.8; 0.5 < = a / b < = 1.3; 0.4 < = c / x < = 1.2; and 0.1 < = d / c < = 0.5.

The invention provides gel with a three-dimensional network structure, a preparation method of the gel and a lithium battery, and belongs to the technical field of lithium batteries. The gel provided by the invention comprises the following raw materials: polyethylene glycol dimethacrylate (PEGDMA) and / or a derivative thereof, a fluorine-containing carbonate compound, a cross-linking agent, a lithium salt, a flame retardant and an organic solvent. The PEGDMA and / or the derivative thereof and the fluorine-containing carbonic ester compound generate a three-dimensional network structure under the action of the cross-linking agent, the fluorine-containing carbonic ester compound can improve the interface stability between the gel and the electrode material, reduce the interface side reaction and improve the thermal stability of the gel, and the performance of the electrode material is improved. Meanwhile, the three-dimensional network structure has relatively high porosity and liquid absorption capacity, so that an ion transmission channel is improved, and the ionic conductivity of the gel is further improved. The room-temperature ionic conductivity of the gel with the three-dimensional network structure is larger than or equal to 3 mS / cm, and the thermal decomposition initial temperature is larger than or equal to 250 DEG C.

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly and an electrolyte, the electrode assembly comprises a positive pole piece, the positive pole piece comprises a positive active material layer, and the positive active material layer comprises lithium-containing phosphate of an olivine structure; the electrolyte comprises, by mass, 8-30% of a carboxylic ester solvent, a lithium salt and an unsaturated ester additive, the lithium salt comprises lithium hexafluorophosphate and fluorine-containing lithium sulfimide, the mass content of the fluorine-containing lithium sulfimide in the lithium salt is 18-45%, the mass content of the unsaturated ester additive in the electrolyte is 0.05-5%, and the mass content of the unsaturated ester additive in the electrolyte is 0.05-5%. The unsaturated ester additive comprises one or more of vinylene carbonate, vinylethylene carbonate, allyl ethyl carbonate and a fluoro-carbonate additive; the amount of electrolyte in the battery cell is 2.8 g / Ah to 3.2 g / Ah. According to the invention, rapid charging and use reliability of the single battery can be considered.

The present invention relates to a composition containing A) 60 to 93 wt. % of at least one aromatic polycarbonate, polyester carbonate or mixtures thereof, B) 2 to 20 wt. % of a polyester on the basis of an aromatic or cycloaliphatic dicarboxylic acid or mixtures thereof and cyclohexane dimethanol and optionally an additional aliphatic diol, and C) 1 to 20 wt. % of at least one phosphorus-containing flame retardant. The invention also relates to a component that contains the composition and to the use of components B and C in the indicated quantities in order to improve CTI and flame retardancy of polycarbonate compositions.

The invention discloses a battery monomer, a battery device and electric equipment, the battery monomer comprises an electrode assembly and an electrolyte, the electrode assembly comprises a positive pole piece, the positive pole piece comprises a positive current collector and a positive active material layer arranged on at least one side of the positive current collector, and the positive active material layer comprises lithium-containing phosphate; the electrolyte comprises a carboxylic ester solvent and a linear carbonic ester solvent, based on the total mass of the electrolyte, the mass ratio of the carboxylic ester solvent is 5%-25%, and the mass ratio of the linear carbonic ester solvent is 20%-49%; the electrolyte further comprises a non-lithium salt additive, the non-lithium salt additive comprises a phosphate ester additive, and the non-lithium salt additive further comprises at least one of a carbonate ester additive, a sulfate ester additive, a borate ester additive, a silane additive and a sultone additive. The total mass of the non-lithium salt additive accounts for 0.1%-5%.

The embodiment of the invention provides a sodium-ion battery and electric equipment, the sodium-ion battery comprises a positive electrode, a negative electrode, a diaphragm and an electrolyte, and the electrolyte comprises a cyclic carbonate solvent and / or a carboxylic ester solvent; the ratio of the mass ratio of the cyclic carbonate solvent in the electrolyte to the sum of the D50 particle size of the positive electrode active material and the D50 particle size of the negative electrode active material is (0.005: 1)-(0.2: 1); the ratio of the mass ratio of the carboxylic ester solvent in the electrolyte to the sum of the D50 particle size of the positive electrode active material and the D50 particle size of the negative electrode active material is 0.002: 1 to 0.1: 1; wherein the unit of the D50 particle size is [mu] m. According to the sodium-ion battery, by reasonably designing the specific incidence relation between the D50 particle size of the positive and negative electrode active materials and the electrolyte solvent, the ion transmission and ion diffusion capability in the charging and discharging process of the battery can be effectively balanced, the low-temperature dynamic performance of the battery is improved, and meanwhile, the high-temperature performance is considered.

The invention discloses an electrolyte for a lithium manganate lithium ion battery and a preparation method thereof, and the electrolyte comprises the following components in percentage by mass: 70-90% of an organic solvent, 5-20% of a lithium salt and 0.5-10% of an additive, the organic solvent is formed by mixing cyclic carbonate and chain carbonate according to the mass ratio of (10-30): (70-90); the lithium salt adopts one or more of lithium hexafluorophosphate (LiPF), lithium tetrafluoroborate (LiBF) and lithium bis (trifluoromethane sulfonimide) (LiTFSI), and the concentration of the lithium salt is 0.8 to 1.5 mol / L; the additives comprise a manganese ion complexing agent, a film forming accelerant and an antioxidant. In the invention, the manganese ion inhibition effect is as follows: the complexing agent and Mn (II) ions form a stable complex, so that the concentration of free Mn (II) in the electrolyte is reduced by more than 80%, migration and deposition of the free Mn (II) to the negative electrode are inhibited, and the dissolution amount of the Mn element of the positive electrode is reduced by 65% after 500 times of circulation at 45 DEG C.

The invention provides a system and a method for producing high-purity electronic-grade carbonic ester, and the system comprises a heterogeneous reaction section, a separation section and a crystallization section along the material flow direction, the heterogeneous reaction section is used for carrying out heterogeneous reaction on ethylene oxide and carbon dioxide to prepare carbonic ester; the separation section is used for separating materials from the heterogeneous reaction section and comprises a flash evaporation unit and a rectification unit in the material flow direction, and the flash evaporation unit comprises at least one flash evaporation tank; the rectification unit comprises at least one rectification tower, and the side-draw of the rectification unit is communicated with the feed port of the crystallization section; and the crystallization section is used for crystallizing and purifying the material mainly containing carbonic ester from the separation section. According to the method, high-purity ethylene carbonate used as a power battery can be obtained from the crystallization section, and crystallization mother liquor can be selectively returned to the separation section to be concentrated. The method can effectively improve product purity, reduce product chromaticity and reduce energy consumption, and can be applied to industrial production of carbonic ester.

The invention discloses a non-aqueous electrolyte and a lithium ion battery containing the non-aqueous electrolyte. The non-aqueous electrolyte comprises a lithium salt, a non-aqueous organic solvent and an additive, wherein the additive comprises a benzenesulfonyl fluoride compound as shown in a structural formula I and a carbonate bisulfate compound as shown in a structural formula II. According to the non-aqueous electrolyte disclosed by the invention, the benzenesulfonyl fluoride compound and the polyol carbonate bisulfate compound are used as additives, and the benzenesulfonyl fluoride compound and the polyol carbonate bisulfate compound are matched for use, so that the ion transmission rate can be increased, the high-temperature cycle performance of the lithium ion battery is improved, the internal resistance is reduced, and the high-temperature storage performance of the lithium ion battery is improved. # imgabs0 #

A polycarbonate composition and a use thereof. The product introduces a processing fluidity improver, such that the processing process fluidity of the whole product can be effectively improved, and after processing, especially after thin-wall processing, the product has good toughness, injection molding stability and appearance performance. The processing fluidity improver is a mixture of a polydimethylsiloxane containing a terminal hydroxyl group and a polystyrene containing an epoxy group.

The invention discloses a preparation method of an optical OCA (Optical Clear Adhesive) and application of the optical OCA in a mobile phone folding screen, and relates to the technical field of optical cement, the optical OCA is prepared from the following raw materials in parts by weight: 50 parts of acrylate prepolymers, 2-4 parts of 3-allyl-2-mercapto-3H-quinazoline-4-ketone, 1-3 parts of diallyl disulfide, 1-3 parts of 3-[N, N-dimethyl formamide], 1-3 parts of 2, 3, 5-trimethyl-1, 3-pentanediol monoisobutyronitrile, 1-3 parts of 2, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3 The preparation method comprises the following steps: adding 3-5 parts of N, N-dimethyl-[2-(2-methylpropane-2-enoyloxy) ethyl] ammonium] propane-1-sulfonic acid inner salt, 1-3 parts of allyl succinimido carbonate, 2-4 parts of dicyclopentene methacrylate, 1-3 parts of 1, 3, 5-triacryloyl hexahydro-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5- The invention relates to a graphene quantum dot photoinitiator which is prepared from the following components in parts by weight: 1-3 parts of 1, 3, 5-triazine, 0.8-1.2 parts of a photoinitiator, 1-3 parts of an aziridine cross-linking agent, 1-3 parts of graphene quantum dots, 0.8-1.2 parts of a coupling agent and 40-50 parts of a diluent. The optical OCA adhesive is high in light transmittance and bonding strength, good in weather resistance and excellent in folding resistance.

The invention belongs to the technical field of polyurethane materials, and particularly relates to high-strength polyurethane based on carbon dioxide polycondensation and a preparation method of the high-strength polyurethane. The high-strength polyurethane is prepared from the following raw materials in parts by mole: 100 parts of diisocyanate; 0.05 to 0.5 part of a catalyst; the sum of the parts of the polycarbonate diol and the chain extender is 100, and the part of the chain extender is 25-50. The polyurethane soft segment provided by the invention is directly polycondensed based on carbon dioxide instead of using a carbonic ester monomer, so that the utilization rate of carbon dioxide is greatly increased, and the sustainable development of the polyurethane material industry is facilitated. Meanwhile, a chain extender used in polyurethane contains adjustable high-density hydrogen bonds, so that the elastomer material has excellent mechanical properties, high strength and high toughness, and the tensile strength can reach 80 MPa or above; the chain extender is derived from sustainable resources, and the structure can be flexibly regulated and controlled. The polyurethane preparation method provided by the invention is simple to operate, is suitable for large-scale continuous line production, and has good implementation value and market prospect.

The present invention provides a cyclic carbonate synthesis method, and belongs to the technical field of organic ester compound synthesis, and the cyclic carbonate synthesis method comprises the following steps: S1, 1, 3-propylene glycol, a dehydrating agent and a catalyst are added into a high pressure reaction kettle, and CO2 is introduced into the high pressure reaction kettle for a reaction; s2, after the reaction is finished, after the high-pressure reaction kettle is cooled to the room temperature, redundant gas in the high-pressure reaction kettle is discharged, after the gas in the high-pressure reaction kettle is completely discharged, the high-pressure reaction kettle is opened, the catalyst is filtered out, and the solution is subjected to vacuum-pumping separation to obtain a target product; the catalyst is a heterogeneous catalyst MxOy (at) Zn-dpot. Carbon dioxide conversion is carried out in a chemical utilization mode, a chemical product trimethylene carbonate can be produced, the synthesis route is easy to operate, and after the MxOy at Zn-dpot catalyst is added, the yield is high, the high additional value is achieved, and the green chemistry concept is met.

The invention relates to the technical field of fluorination processes, in particular to a purification method of a high-purity fluorocarbonate-based solvent, which comprises the following steps: S1, introducing fluorocarbonate-based solvent crude gas into a purification cavity, and liquefying the crude gas through a liquefaction separation module; s2, separating the liquid obtained in the step S1, conveying the separated liquid into a crystallizing pond, cooling the liquid in the crystallizing pond to enter a crystallization critical state, rotating the rotating crystal plate group in the crystallizing pond, crystallizing the liquid on the surface of the rotating crystal plate group, and continuously collecting crystals above the crystallizing pond through a collecting assembly; and S3, washing and filtering the crystals collected in S2 to obtain the high-purity fluorocarbonic ester-based solvent. According to the purification method of the high-purity fluorocarbonate-based solvent provided by the invention, crude gas is liquefied by adopting the liquefaction module, and then the liquefied liquid is continuously crystallized and collected by adopting the rotary crystallization module, so that the high-purity fluorocarbonate-based solvent can be efficiently and simply prepared, and the purification method has good industrial value.

The present invention discloses a method for upgrading polyester materials to dicarboxylic acid esters and ethylene carbonate, and relates to the comprehensive utilization of waste resources and the cascade utilization of raw materials. The method uses multiple types of green ionic liquid catalysts to catalyze the methanolysis reaction of PET, and then dimethyl carbonate captures the generated ethylene glycol in situ, forms a five-membered cyclic ethylene carbonate through nucleophilic cyclization, pulls the reaction equilibrium to move forward, and completely depolymerizes PET waste. The products of the method of the present invention are dimethyl terephthalate and five-membered cyclic ethylene carbonate. The present invention can be used for the depolymerization and upgrading of waste PET materials, and can also be used for other similar polyesters, such as polyethylene succinate, polyethylene adipate and polyethylene 2,5-furan dicarboxylate, which are also suitable for the recovery strategy of the present invention, and the products are the corresponding dimethyl succinate, dimethyl adipate and 2,5-furan dicarboxylate.

The present invention relates to the technical field of lithium ion battery manufacturing, and in particular to an in-situ gel polymer electrolyte and its preparation method and application. It includes: dissolving lithium salt in a mixed organic solvent of 1,3-dioxolane and carbonate organic matter, stirring and mixing evenly under the conditions of room temperature, inert gas protection and a rotation speed of 100 to 1000 rpm; dissolving additives in an electrolyte, stirring under the conditions of room temperature, inert gas protection and a rotation speed of 100 to 1000 rpm; adding an initiator, stirring under the conditions of room temperature, inert gas protection and a rotation speed of 100 to 1000 rpm to obtain an in-situ gel polymer electrolyte. The advantages are: the initiator triggers the in-situ polymerization of 1,3-dioxolane, forms a gel polymer electrolyte in situ in the battery, improves the compatibility of the interface, and reduces the battery impedance; forms a stable interface film, improves the stability of the electrode interface, and improves the room temperature rate performance and low temperature performance of the battery.

The invention relates to an organic acid anion paired polyion liquid catalyst as well as a preparation method and application thereof. Due to environmental pollution caused by halogen, a series of environment-friendly porous polyion liquid catalysts paired with organic acid anions are designed and synthesized, 1-vinyl imidazole and bis (2-chloroethyl) ether are used as raw materials, and the ionic liquid diethyl ether bis (1-vinyl imidazole) chloride is successfully prepared. Divinyl benzene is selected as a cross-linking agent and a structure stabilizer, and a stable copolymer is prepared. The copolymer is put into a sodium hydroxide solution to react for three days, hydroxyl replaces chloride anions to obtain a substance [ECD] OH, the [ECD] OH is put into an organic acid solution to react for three days, and finally, organic acid anions replace halogen anions, so that the pollution to the environment is reduced. The series of catalysts are stable in structure, and can efficiently catalyze carbon dioxide cycloaddition to generate cyclic carbonate under the conditions of no solvent and no cocatalyst.

The invention provides a polycarbonate-polysiloxane copolymer as well as a preparation method and application thereof, and belongs to the technical field of polycarbonate material preparation. The polycarbonate-polyorganosiloxane copolymer comprises a polycarbonate block and a polyorganosiloxane block, and the polycarbonate-polyorganosiloxane copolymer comprises a polycarbonate block and a polyorganosiloxane block. A high-boiling-point solvent capable of simultaneously dissolving polysiloxane and polycarbonate is added, and a high-boiling-point cosolvent capable of improving intersolubility of polysiloxane and other monomers (an aromatic bisphenol compound and / or an aliphatic diol compound and diester carbonate) is introduced into a melt transesterification polycondensation method; in the ester exchange stage, the intersolubility of reaction monomers is improved, the conversion rate of polysiloxane is improved, and the transparency and molecular weight of the copolymer are improved.

The invention relates to a silicon-containing polycarbonate diol, a polyurethane elastomer material and a preparation method thereof, and belongs to the technical field of organic materials. The glass transition temperature (Tg) of the silicon-containing polycarbonate diol ranges from 40 DEG C to 60 DEG C below zero, the hydroxyl value ranges from 60.4 mgKOH / g to 67.9 mgKOH / g, the product purity is high, the product purity is 98 or above, and the number-average molecular weight of the polycarbonate diol ranges from 1900 Da to 2200 Da. The low-temperature flexibility of the polycarbonate diol is effectively improved, and the use temperature range of the polycarbonate diol is widened. The polycarbonate diol disclosed by the invention is stable in hydroxyl value and narrow in molecular weight distribution; the product quality is good, and subsequent application is facilitated. The polycarbonate diol is short in preparation time, high in efficiency, simple in technological process, mild in technological condition and suitable for large-scale industrial production. The raw materials are low in cost.

The invention relates to a battery monomer, a battery device and a power utilization device. The battery monomer comprises a positive pole piece and a negative pole piece, the positive pole piece comprises lithium-containing phosphate; the negative pole piece comprises graphite particles; the electrolyte comprises a carboxylic ester solvent, a linear carbonic ester solvent and an additive, the mass content of the carboxylic ester solvent is 10%-30%, and the mass content of the linear carbonic ester solvent is 10%-50%; the mass content of the additive is 3%-9%, the additive comprises 1, 3-propane sultone with the mass content larger than or equal to 0, an ethylene carbonate derivative with the mass content larger than or equal to 0 and vinylene carbonate with the mass content larger than 0, and the ethylene carbonate derivative comprises a compound shown in the formula A; q1, Q2, Q3 and Q4 each independently comprise any one of a hydrogen atom, a halogen atom, a C1 to C5 alkyl group or a C1 to C5 halogenated alkyl group, and Q1, Q2, Q3 and Q4 are not hydrogen atoms at the same time. # imgabs0 # formula A is shown in the specification.

The invention relates to the field of chemical synthesis, in particular to a production process of allyl diethylene glycol dicarbonate, which comprises the following steps: by taking allyl alcohol and dimethyl carbonate as raw materials, carrying out transesterification under the action of a core-shell catalyst to generate dipropylene carbonate; carrying out solid-liquid separation, carrying out reduced pressure distillation to recover methanol and dimethyl carbonate, and then carrying out second-step ester exchange reaction with diethylene glycol under the action of the same catalyst to generate allyl diethylene glycol dicarbonate; and finally, performing multi-stage reduced pressure distillation purification to obtain a high-purity product. According to the core-shell type catalyst, an MCM-41 molecular sieve is used as a carrier, an inner core is formed after amino modification and zirconium ion coordination, then an interface layer and a phenyl modified silicon dioxide shell are used for packaging, and the core-shell type catalyst has high activity, high selectivity and excellent structural stability. The method has the advantages of mild process conditions, recyclable catalyst, high product yield and excellent purity, and is suitable for industrial production.

The invention belongs to the technical field of concrete, and particularly relates to a polycarboxylate superplasticizer and a preparation method thereof. The polycarboxylate superplasticizer is prepared from an unsaturated polyether macromonomer, an unsaturated acid monomer, an unsaturated carbonate monomer, an unsaturated amino monomer, an initiator, a reducing agent, a chain transfer agent, deionized water, a solubilizer and organic alcohol amine. Wherein the unsaturated carbonate monomer is allyl methyl carbonate, and the unsaturated amino monomer is 2-aminoethyl methacrylate hydrochloride. According to the invention, excellent water reducing effect and stable control capability on concrete slump are maintained, and micro-cracks can be effectively made up through a dual mechanism formed by carbonate release and CaCO3 precipitation in the early and later stages of concrete hardening.

Disclosed are a two-component low-density PU structural adhesive, a preparation method therefor and an application thereof. The two-component low-density PU structural adhesive is composed of Component A and Component B, where a volume ratio of Component A to Component B is 1:0.8-1.2, Component A includes polyether carbonate polyol, castor oil or / and modified castor oil, bisphenol A polyether polyol, a chain extender, hollow glass beads, molecular sieve, fumed silica, a silane coupling agent and catalysts, specifically, the polyether carbonate polyol and the castor oil or / and the modified castor oil cannot be zero at the same time; and Component B includes isocyanate prepolymer, polyisocyanate, hollow glass beads, fumed silica, and a dehydrating agent, the present disclosure solves the problems of poor storage stability, low bonding strength and low elongation at break of the low-density structural adhesive in the prior art.

An electrolyte solution for a lithium secondary battery, including a first solvent comprising a heterocyclic compound having at least one double bond, and any one of an oxygen atom and a sulfur atom; a second solvent including at least one of an ether-containing compound, an ester-containing compound, an amide-containing compound, and a carbonate-containing compound; a lithium salt; lanthanum nitrate; and an additive including lithium nitrate.

The invention relates to the technical field of fluorination equipment, in particular to high-purity fluorocarbonate-based solvent purification equipment, which comprises a purification main body internally provided with a purification cavity; the liquefaction separation module is arranged at the top of the purification cavity and is used for exchanging heat with the crude gas entering the purification cavity, so that the crude gas is liquefied and then subjected to gas-liquid separation; the rotary crystallization module comprises a crystallization pond, a rotary crystal plate group and a collection assembly, the crystallization pond is arranged below the purification cavity and used for receiving the liquefied and separated liquid phase, the rotary crystal plate group partially extends into the crystallization pond, and the rotary crystal plate group continuously rotates, so that liquid in the crystallization pond is crystallized on the surface of the rotary crystal plate group; and then the crystals are collected by the collecting assembly after rotating to the upper part of the crystallizing pond. According to the purification equipment for the high-purity fluorocarbonic ester-based solvent, the high-purity fluorocarbonic ester-based solvent can be continuously obtained in a manner of liquefying and then continuously crystallizing and collecting, so that the purification equipment has a good industrial value.

The embodiment of the present invention discloses a sodium ion battery electrolyte, a sodium ion battery and an electrical device, wherein the sodium ion battery electrolyte comprises a sodium salt and a sulfonate compound, wherein the sulfonate compound comprises one or more compounds represented by formula (I), formula (II) and formula (III), wherein R1, R5, R6, R9 and R 10 independently selected from C1-C3 alkylene, R2, R3, R4, R7, R8 and R 11 Independently selected from C1-C3 alkyl or C1-C3 fluoroalkyl. The sulfonate compound contains both sulfonate and carbonate groups in its molecule, acting as a film-forming additive to promote the formation of a uniform and stable SEI film rich in sulfate and sulfite on the electrode surface, thereby improving the cycle performance and rate performance of sodium-ion batteries.

The invention provides an ultrasonic activated azido precursor, a prodrug and application. The precursor and an active drug react and are bonded to obtain the azido prodrug; the bonding group of the active medicine is amino, hydroxyl or sulfydryl; a bonding group of the ultrasonic activated azido precursor is an ester group. Novel ultrasonic activatable groups, namely p-azidobenzyloxycarbonyl and derivatives thereof, are adopted, hydrogen atoms on a benzene ring are substituted to different degrees, the reducing capacity of a precursor can be remarkably improved, azide is effectively reduced into amino through ultrasonic stimulation under the action of TBR and NADH, and then a self-elimination reaction is induced to release active drugs. The structure has the advantages that different types of active drugs (active pharmacodynamic groups can be amino, hydroxyl and sulfydryl) can be bonded through 4-nitrophenyl carbonate, high-selectivity reduction is performed under the triple action of ultrasound, TBR and NADH, active raw drugs are released according to needs, and toxicity reduction and synergism are achieved.

A polyol block copolymer comprising a polycarbonate block, A (-A′-Z′—Z—(Z′-A′)n-), and polyethercarbonate blocks, B. The polyol block copolymer has the polyblock structure:B-A′-Z′—Z—(Z′-A′-B)n wherein n=t−1 and wherein t=the number of terminal OH group residues on the block A; and wherein each A′ is independently a polycarbonate chain having at least 70% carbonate linkages, and wherein each B is independently a polyethercarbonate chain having 50-99% ether linkages and at least 1% carbonate linkages; and wherein Z′—Z—(Z′)n is a starter residue. A process of producing a polyol block copolymer from a two step process carried out in two reactors, and products and compositions incorporating such copolymers.

The invention belongs to the technical field of synthesis of polyol carbonate materials, and discloses a preparation method of polyol carbonate. The preparation method disclosed by the invention comprises the following steps: mixing solid polyol with a eutectic component to form a low-melting-point eutectic substance, and then adding a reactant to carry out cyclization reaction, so as to prepare the cyclic or multi-cyclic polyol carbonate. According to the method, the polyol and the eutectic component are mixed to form a low-melting-point eutectic substance, and the hydrogen-bond interaction of the polyol is weakened through the intermolecular interaction of the eutectic component and the polyol, so that the cyclic or multi-cyclic polyol carbonate can be prepared at high selectivity and high yield under mild conditions.