74results about How to "Easy to chemically modify" patented technology

The present invention relates to modified rubber powder and its preparation process and use. Structurally, the modified rubber powder has alkyl group, alkenyl group, hydroxyl group, carboxyl group, nitrile group or amino group in the side chain or has side chain connected via double bond reaction to butadiene, polystyrene, vinyl acetate, acrylate, acrylonitrile or other compound. The modified rubber powder has the structural features of rubber retained and thus excellent mechanical performance, physical and chemical performance and machining performance. The introduction of functional group to the side chain results in obviously raised compatibility with other rubber material, plastic and other polymer material, easy grafting reaction and functional group chemical reaction for further modification. In addition, the performances may be regulated via altering the sort and amount of the introduced functional groups.

The invention relates to a preparation method of a reed-based biochar adsorption material. The preparation method is technically characterized by comprising the following steps of cleaning the reed stalk, drying and crushing; soaking the crushed reed stalk into a KOH (potassium hydroxide) solution to activate, and drying; putting the dried crushed reed stalk into an atmosphere furnace, and performing oxygen-free high-temperature cracking under the nitrogen or inert gas protection atmosphere; after high-temperature cracking treatment, cooling to room temperature, and cleaning the cracked material to be neutral by an acid solution, so as to prepare the reed-based biochar adsorption material. The preparation method has the advantages that the problems of pollution to environment and waste ofresources due to irresponsible disposal of the wetland plant wastes are solved; compared with the prior art, the specific surface area is large, the pollutant adsorption ability is strong, the environment-friendly value is greatly increased, and the resource utilization of the wastes is realized.

The invention discloses a polymer porous microsphere, and a preparation method and applications thereof. A carbon sphere, and a preparation method and applications thereof are also disclosed. The carbon sphere is prepared from the polymer porous microsphere. An ultra-black material composition, and a ultra-black material prepared from the same and applications are disclosed as well. The ultra-black material composition includes the carbon sphere. As a linear polymer containing groups like halogen and hydroxy and having no heteroatom on a main chain has high degree of crystallinity and abundantcrystal types, the morphology of the obtained microsphere is also special, and a composition structure can include a sheet structure, a bicontinuous structure and a fibrous structure. The morphologyof the polymer porous microsphere can maintain unchanged through carbonization, so that the prepared carbon sphere can well maintain the morphology structure and porosity of the polymer porous microsphere; and a graphite structure with multiple defects can be formed during carbonization, so that the pore canal structure can be more abundant, and especially, the volumes of micropores can be greatlyenhanced.

The invention provides a fluorescent silk fiber based on BODIPY dyes and a preparation method of the fluorescent silk fiber. The preparation method comprises the following steps: swollen silk fibers are immersed in a zeolite-containing aqueous solution and are pretreated, then are repeatedly immersed in hydrophilic BODIPY fluorescent dyes and a low molecular chitosan solution, and finally are steamed, heated and cured to obtain the fluorescent silk fiber. The fluorescent silk fiber based on BODIPY dyes prepared according to the method is stable in fluorescence, high in strength and uniform in color, can be produced in large scale, has excellent mechanical properties and high flexibility, and is applicable to the textile, bio-medical treatment, anti-counterfeiting and many other fields.

The invention discloses a method for preparing a natural polyelectrolyte nanofiltration membrane and belongs to the technical field of preparation of membrane materials. According to the method disclosed by the invention, a quaternary ammonium cation cellulose ether and a quaternized chitosan blend form an ultra-thin separation layer material, polyvinyl alcohol serves as a casting solution additive, and polysulfone serves as a supporting layer material; two kinds of natural polyelectrolyte serve as a membrane material, and a cross-linking agent is added, so that the two polymers are cross-linked to form a spatial semi-interpenetrating network structure, the polymer networks are mutually tangled, and therefore, the membrane structure stability is enhanced. Meanwhile, the natural polyelectrolyte charged nanofiltration membrane has an antibacterial group capable of inhibiting and killing bacterium components in water, while the membrane structure is provided with many hydrophilic groups,and the hydrophilic property on the membrane surface is excellent. Meanwhile, the raw materials are readily available, the cellulose belongs to renewable resources, the chitosan belongs to natural polysaccharides, any risk of environmental pollution is avoided, and the preparation method is convenient and practical.

This invention discloses a method for preparing biomimic membrane material of polyasparagine and chitosan copolymer. The method comprises: preparing polyasparagine or its derivative with different side chains, copolymerizing and crosslinking with chitosan in an acidic medium to obtain environmentally friendly biomimic membrane material of polyasparagine and chitosan copolymer. The biomimic membrane material can be used for membrane separation, or as an environment-sensitive membrane material. The biomimic membrane material can be widely applied in such fields as pharmacy, food industry, printing and wastewater treatment.

The invention discloses a method for preparing composite material of poly-aspartic acid or a derivative thereof, chitosan and a calcium-phosphate compound. The method is as follows: firstly, the poly-aspartic acid with different side chains or the derivative thereof is synthesized, then the poly-aspartic acid with different side chains or the derivative thereof, the chitosan and calcium-containing solution are mixed, reacted and precipitated under certain temperature and pH value. The obtained product has the characteristic of imitating a cell envelope and is environment-friendly biomimetic material. The material has the function of absorbing heavy metals and certain organic substances, can be used to remove the heavy metals, chlorohydrocarbon, organic pigment, dyes and so on, and is widely used for fields such as medicine industry, food engineering, printing and dyeing industry, sewage treatment and so on.

The invention belongs to the technical field of polymer membrane materials, and discloses a chiral-separation solid membrane grafted by a chiral identification body through dopamine pretreatment, and a making method and an application thereof. The method includes the following concrete steps: 1, immersing a solid membrane in a dopamine solution, stirring for reacting, and flushing with clear water; and 2, immersing the flushed solid membrane in a solution of the chiral identification body, heating for reacting, washing, and carrying out vacuum drying to obtain the chiral-separation solid membrane grafted by the chiral identification body through dopamine pretreatment. Firm and stable fctive function groups comprising -NH2, -OH and -C=O are introduced to the surface of the solid membrane through the above immersion technology; and chiral recognition sites are introduced to the surface of the solid membrane through the above immersion technology without influencing the structure or performances of the membrane, so the chiral-separation solid membrane grafted by the chiral identification body through dopamine pretreatment can be used for the effective separation of racemes The making method has the advantages of realization of the implementation of above reactions in an aqueous solution for a whole course, and mild and unharsh reaction conditions, development of the modification selectivity of the solid membrane, simple process, and easy realization of the industrialized batch production.

The invention relates to an integrated porous polymer adsorption extraction stirring bar and its manufacturing method. The stirring bar comprises a stirring magneton and a coat coated outside the stirring magneton, wherein the coat is an acrylonitrile-ethylene glycol acrylate-itaconic acid copolymer. A mixed solvent of dimethyl formamide and caprolactam is added to a reaction system as a pore forming agent, azodiisobutyronitrile is used to carry out thermal initiation of an in-situ free radical polymerization reaction, and a prepared integrated porous material is adopted as the coat of the adsorption extraction stirring bar, so the adsorption extraction stirring bar has the advantages of rapid adsorption and desorption rates, large extraction capacity, and realization of the adoption of an equilibrium extraction mode of solid phase micro-extraction or a depleted extraction mode of solid phase extraction. The ethylene glycol acrylate which is a crosslinking agent improves the mechanical performances of the coat of the stirring bar and prolong the service life. The itaconic acid which is a modifier makes the extraction coat contain a plurality of carboxyl groups, and can directly adsorb and extract parts of heavy metal cations and polar organic compounds. The preparation method is simple and can be easily operated.

The invention provides a method for preparing composite modified starch for biodegrading plastic, comprising: adding an activator in dry starch, for pretreatment under 95-100 DEG C for 30min; adding an esterification reagent into the starch after activation, for making esterification reaction under 120-125 DEG C for 1h, wherein the whole press is carried out in a solid phase state; adding a solid coupling agent into the material after esterification, for making a phase coating reaction in case of stirring under 125-130 DEG C for 40-50min, wherein the whole press is carried out in a solid phase state; cooling the material until to room temperature, screening the material with 60 mesh sieves, and then packaging the material to obtain the finished product.

The invention discloses a preparation method of a biomimetic material, in particular relates to a method for preparing the composition material of poly-aspartic acid or the derivatives, chitosan, lecithin and calcium-phosphate compound. The method first compounds poly-aspartic acid or the derivatives with different side chains, and then makes the poly-aspartic acid or the derivatives with different side chains, chitosan, lecithin, calciferous solution and crosslinking agent mix, react and settle down under a certain temperature and pH value. The obtained product has the properties of biomimetic membrane materials and is an environment-friendly biomimetic material. The material has the function of absorbing heavy metals and some organics, can be used for removing heavy metals, chlorinated hydrocarbon, organic pigment and dye, and can be widely applied to pharmaceutical industry, food industry, printing and dyeing industry, waste water treatment and other fields.

A molecular sieve composite material having a core-shell structure, a preparation method and an application thereof. The preparation method includes the steps of: (A) preparing micro-pore molecular sieve slurry; (B) mixing and pulping meso-pore aluminum oxide molecular sieve with water, and regulating the pH value of the mixture with an acid to 1.5-5 to prepare meso-pore aluminum oxide molecular sieve peptized slurry; and (C) mixing the micro-pore molecular sieve slurry with the meso-pore aluminum oxide molecular sieve peptized slurry and allowing the slurry to stand to age the slurry for 10-60 min, and filtering, washing and drying the slurry and roasting the slurry at 150-800 DEG C for 0.5-2 h to obtain a finis product. Compared with a conventional in-situ coating method, the preparation method avoids complex in-situ coating and subsequent crystallizing operations and has simple processes. The meso-pore aluminum oxide molecular sieve coating material is synthesized before, so that regulation and chemical modification on the coating material are easy to carried out compared with the in-situ coating method and the like.

Relating to the field of analytical chemistry detection, the invention provides a carbon paste electrode for detection of hydroquinone, and a preparation and detection method thereof. The carbon paste electrode for detection of hydroquinone comprises a carbon paste, an electrode tube, an electrode lead wire, and a graphene oxide coating. The electrode tube has a first end and a second end opposite in positions, the carbon paste is pressed into the electrode tube from the first end of the electrode tube, the electrode lead wire contacts the carbon paste, and is led out from the second end of the electrode tube, and the graphene oxide layer is formed on the surface of the first end. The carbon paste electrode modifies graphene oxide to a carbon paste electrode substrate, and graphene oxide is an excellent modifier and has good electrocatalytic response to hydroquinone. Also the carbon paste electrode has the advantages of simple making, long service cycle, good stability, high sensitivity, low cost, easy preparation and excellent reproducibility, etc., and can be used for determination of hydroquinone in water samples. In addition, the invention also relates to a preparation method of the carbon paste electrode and a detection method of hydroquinone.

The invention discloses a preparation method of a cellulose flat nanofiltration membrane with a stable structure. According to the preparation method, a regenerated cellulose membrane, taken as a supporting layer is soaked in a dopamine solution for surface modification, and the regenerated cellulose membrane subjected to surface modification is sequentially put into a piperazine aqueous solutionand an n-hexane solution of trimesoyl chloride for reaction, so that a polyamide active layer is formed on the surface of the membrane. With the use of dopamine, the interaction force between the basemembrane and the polyamide active layer is increased, such that a support layer and the active layer are tightly combined, and the prepared nanofiltration membrane has good stability.

The invention provides a preparation method of a flame-retardant modified ramie fabric. The method comprises the following steps of soaking a ramie fabric in a coupling agent solution for 1-2 hours, and taking out and drying the soaked ramie fabric; soaking the dried ramie fabric in a poly-diphenolic acid phenyl phosphate ester solution for 5-10 minutes, and washing the soaked ramie fabric 1-3 times with deionized water; drying the washed ramie fabric, soaking the dried ramie fabric in a polyethyleneimine solution for 5-10 minutes, and then washing the soaked ramie fabric for 5-10 minutes; cleaning the soaked 1-3 times with the deionized water, and drying the cleaned ramie fabric; and repeating the process until the required layer number is achieved, and then performing drying, so as to obtain the objective namely the flame-retardant modified ramie fabric. The preparation method is simple in technological operation, flexible, and good in stability, and the flame retardancy of the ramie fabric can be effectively improved.

The invention relates to a treatment method for a moisture-proof surface of a resin-based insulating material. The treatment method comprises the following steps: using blasting shots different in number for two-step blasting treatment, to build a multilevel rough structure; then placing the multilevel rough structure into a strong alkali or acid solution, to further roughen the multilevel rough structure and activate the surface; modifying the structure with fluorosilane after oxygen plasma treatment, so that the surface of the insulating material has moisture resistance and condensation resistance. The treatment method is simple in preparation process, free of pollution, low in cost, and suitable for promotion and application.

The invention discloses a preparation method for a paper-making sizing agent, which comprises the following steps: 1) hydrolyzing gelatin to obtain collagen; 2) dissolving the collagen obtained from the step 1) in water to prepare a collagen aqueous solution with the collagen of which the mass concentration is 10-30 percent, adjusting the pH of the collagen aqueous solution to 5.0-10, dropping a cross-linking agent of which the mass is 2-10% of that of the collagen in the collagen aqueous solution, and reacting for 2-4 h at 35-55 DEG C to obtain a cross-linking collagen system; 3) adding a hydrophobic monomer in the cross-linking collagen system obtained from the step 2) under the condition that the mass ratio of the hydrophobic monomer to the collagen is 1: (1-3), adding an initiator 3-5% of the mass of the hydrophobic monomer in the cross-linking collagen system, pre-initiating for 15-30 min, and finally carrying out the grafting reaction for 2-4 h at 65-85 DEG C to obtain a white emulsion, namely the cross-linking-grafting dual modified collagen paper-making sizing agent. Biomass resource collagen is used as a raw material, and the problem of environment pollution is alleviated while the cost is lowered.

The invention discloses a preparation method and application of aptamer-modified chitosan nano fibers. The preparation method comprises the following steps: (1) preparing a chitosan solution; (2) preparing chitosan nano fibers; (3) chemical immobilization: taking the aptamer solution, adding an EDC / NHS (1-ethyl-3-(3-dimethylaminopropyl)carbodiimide / N-hydroxysuccinimide) solution for activation, adding the chitosan nano fibers obtained in the step (2), and oscillating to react at normal temperature; and (4) after-treatment: carrying out solid-liquid separation on the reaction mixed solution obtained in the step (3) to obtain the aptamer-modified chitosan nano fibers. The aptamer-modified chitosan nano fibers are suitable for high-selectivity separation and enrichment of trace or ultra-trace mycotoxin substances and other substances in the food and environment, and have the advantages of high selectivity, high extraction capacity, high stability and simple preparation process.

The invention provides a medicinal composition and a preparation method thereof. The medicinal composition comprises a carrier and an active component loaded on the carrier, wherein the carrier is nano particles of cyclodextrin-aliphatic polyester-phosphatidyl ethanolamine graft polymer with the structural formula shown in a formula (1) in the specifications; and in the formula (1), m is an integer from 6 to 8, and G is an oxygen atom or has a formula shown in the specifications.

The invention discloses amino-acid-based polyesteramine micelles, a preparation method and application thereof in treating infection wounds. The amino-acid-based polyesteramine micelles are antibacterial micelles prepared by synthesizing amino-acid-based polyesteramine random copolymer from various natural amino acids, and wrapping or grafting the copolymer with an antibacterial drug. The preparation method includes: preparing amino-acid-based polyesteramine random copolymer; synthesizing polyesteramine copolymer grafted with an antibacterial drug, namely antibacterial polyesteramine; preparing polyesteramine solution with the polyesteramine random copolymer, mixing the polyesteramine solution with an antibacterial drug solution to obtain antibacterial micelles I; alternatively, preparingantibacterial polyesteramine solution with antibacterial polyesteramine to obtain antibacterial micelles II. Various copolymer materials can be synthesized herein by changing the ratio of raw components to a hydrophobic unit; compared with block copolymers, the amino-acid-based polyesteramine micelles have the advantages of good simplicity of preparation process, controllable structure and the like. The micelles prepared herein are of nano structure, have more stable structure and can gain improved antibacterial property.

The invention provides waterborne tall oil alkyd resin emulsion and a preparation method thereof. Waterborne alkyd resin is prepared by taking tall oil extracted from papermaking waste liquid as a raw material; a preparation process comprises: (1) taking the tall oil to react with diethanolamine to prepare tall oil diethanolamide; (2) preparing a polyester intermediate by taking the tall oil diethanolamide and dibasic acid with a sulfonic group to react with dihydric alcohol; (3) taking the polyester intermediate, vegetable oil, fatty acid, polyatomic alcohol and polybasic acid to react and adding de-ionized water and dispersing to prepare alkyd resin water dispersoid. The tall oil extracted from the papermaking waste liquid is effectively utilized, and an application range of the tall oil is also expanded.

The invention relates to a chemical magnesium hydroxide particle surface modification method for flame resistance of leather and in particular relates to a method for introducing polymer brushes to a magnesium hydroxide surface by virtue of an atom transfer radical polymerization (ATRP) method to solve the problem that magnesium hydroxide flame retardants have poor compatibility with leather, arebonded with leather insecurely and are not resistant to washing. To be more exact, the invention provides a method by which the content of polymer brushes introduced to the magnesium hydroxide particle surface can be effectively increased to achieve the aim of obviously improving the chemical magnesium hydroxide particle surface modification effect. Magnesium hydroxide composite particles are prepared by introducing initiators to the magnesium hydroxide particle surface by a two-step method. The polymer brushes introduced to the magnesium hydroxide particle surface are controllable in molecular weight and narrow in molecular weight distribution (MWD). The molecular weight and MWD of the polymers are respectively 5700-14000g / mol and 1.5-1.7. The method has the following beneficial effects:the prepared magnesium hydroxide composite particles and such groups as amino groups and carboxy groups in leather collagen can generate hydrogen bonds quite easily, and stronger interactions exit inthe molecules or among the molecules, so that the magnesium hydroxide particles and the leather can be bonded more securely.

The invention discloses a hydroxyl-contained alicyclic epoxy resin and a preparation method thereof. The preparation method comprises the following steps of: mixing a hydroxyl compound with 3,4-epoxycyclohexane carboxylic acid methyl ester; then adding a catalyst and evenly mixing; and heating at 80-150 DEG C for reaction for 3-8 hours in the presence of inert gas shield to obtain the hydroxyl-contained alicyclic epoxy resin. According to the invention, an accelerator is not needed to be added in the solidifying process of the hydroxyl-contained alicyclic epoxy resin, and moreover, the chemical modification performance is good. Solidified products have good heat resistance and mechanical property.

The invention discloses preparation methods of a poly (aspartic acid-co-lactic acid) graft polymer and nanoparticles of the poly (aspartic acid-co-lactic acid) graft polymer, which belong to the field of medicaments. A preparation method for the graft polymer comprises the following steps of: mixing aspartic acid and lactide in a molar ratio of 1:1-10, introducing nitrogen and reacting in an oil bath at the temperature of between 160 and 180 DEG C for 16 to 26 hours with stirring to obtain viscous light brown liquid; and taking out of the oil bath and cooling to obtain light brown solid and dissolving in N,N-dimethylformamide; and filtering unreacted lactide, washing a product obtained after filtering and vacuum-drying at the temperature of between 20 and 30 DEG C for 24 to 48 hours to obtain the poly (aspartic acid-co-lactic acid) graft polymer. The invention also provides a method for coating doxorubicin hydrochloride by using the nanoparticles of the polymer. The invention has the advantages that: the process is convenient to operate, the production cost is reduced, the prepared medicament carrying nanoparticles are mono-dispersed regular spheres, the particle size is controlled to be between 100 and 260nm, and an agglomeration phenomenon is not caused.

The invention belongs to the technical field of film separation and relates to a chitosan / ionic liquid cross-linked gel film with a sandwich structure and a preparation method thereof. The film is characterized in that the film has the sandwich structure, the upper and lower surface layers are arranged as cross-linked surfaces and a gel layer is arranged in the middle. The preparation method comprises the following steps: (1) uniformly mixing chitosan, ionic liquid and solvent under a certain temperature, paving on a polytetrafluoroethylene plate, and drying to remove the solvent to obtain a gel film; (2) soaking the gel film in the solution containing the cross-linking agent and catalyst for 0.2-12 hours and performing the surface cross-linking reaction on the gel film; (3) drying the cross-linked gel film in air for 24 hours, and then transferring into a vacuum drying oven, and processing for 24 hours at 30 DEG C, thereby acquiring the chitosan / ionic liquid cross-linked gel film with the sandwich structure. According to the preparation method provided by the invention, the upper and lower surfaces of the film are cross-linked, so that the chitosan / ionic liquid cross-linked gel film with the sandwich structure is formed, the ionic liquid is difficult to run off, the lasting stability of the physical structure and property of the film is ensured and the preparation method is fit for the separating of the carbon dioxide in the mixed gas and the recycling of the organic steam.

The invention discloses a preparation method of an anti-clay concrete admixture. The method comprises the preparation of polyether glycidyl ether and the preparation of the anti-clay admixture. The preparation of polyether glycidyl ether comprises the following steps: firstly, reacting a polyhydroxy initiator, alkylene oxide and a catalyst at a certain temperature and pressure to prepare polyether polyol; and then continuously adding epichlorohydrin, and performing reaction at a certain temperature and pressure to obtain the polyether glycidyl ether. The preparation method of the anti-clay admixture comprises the following steps: carrying out reaction on polyether glycidyl ether and a secondary amine monomer at a certain temperature and pressure to obtain tertiary amine polyether; and adding halogenated hydrocarbon into the tertiary amine polyether, and performing reaction at a certain temperature and pressure to obtain an anti-clay admixture finished product.

The invention discloses a method for preparing a nanometer ZnS / cellulose complex film with photocatalytic activity. The method comprises the following steps: adopting an NMMO process to prepare a pure cotton pulp cellulose film, and then adopting a liquid impregnation method to prepare the nanometer ZnS / cellulose complex film; renewable resources which are rich in source, safe, nontoxic, and low in cost are utilized as raw materials to prepare a cellulose based composite. The process flow is simple, the preparation process is environment-friendly and pollution-free, and the obtained nanometer ZnS / cellulose complex film has excellent performance of degrading water body pollutant by ultraviolet absorption and photocatalysis; the property of the pure cellulose film, such as excellent chemical resistance stability and heat stability, are retained; the nanometer ZnS / cellulose complex film also has excellent photoelectric and photocatalytic performance, and can be widely applied to photoelectric devices, luminous materials, wastewater treatment materials, biomedical materials and the like.

The invention discloses multifunctional injectable hydrogel and a preparation method thereof, the prepared cerium-loaded functionalized silica-based bioactive glass injectable GelMA can be crosslinkedunder ultraviolet light to form hydrogel, uneven irregular wound surfaces can be filled with the hydrogel, cerium ions and silicon ions are slowly released, antibacterial and vascularization-promoting functions are exerted, and wound healing is promoted. The multifunctional injectable hydrogel disclosed by the invention is formed by physically mixing the prepared cerium functionalized silicon-based BGs and GelMA obtained by chemical grafting and then crosslinking under the irradiation of a photoinitiator and ultraviolet light. The hydrogel can be formed through in-situ injection, can be usedfor diabetic foot wounds, and can be well integrated with surrounding tissues; the silicon-based BGs in the hydrogel can play a role in resisting bacteria and promoting vascularization by releasing cerium ions and silicon ions, so that the infection of diabetic ulcer wounds can be prevented, and the problem of insufficient vascularization of the wounds can be solved.

The invention discloses a preparation method of a chitosan-methacrylic anhydride / calcium carbonate (CSMA / CaCO3) hydrogel slow-release coating. The surface of the coating is of a porous net structure. The preparation method comprises the following steps: (1) preparing a chitosan solution dissolved in dilute acetic acid; (2) adding methacrylic anhydride (MA) into the chitosan solution obtained in the step (1), and grafting methacrylic anhydride on chitosan through a hydrothermal method under a high-temperature condition to prepare chitosan-methacrylic anhydride (CSMA); (3) performing neutralizing, and dialyzing the chitosan-methacrylic anhydride obtained in step (2); (4) adding a photoinitiator I2959 and a calcium chloride solution into the solution obtained in the step (3), and performing ultraviolet irradiation crosslinking to obtain slow-release hydrogel; and 5) introducing ammonium carbonate into the hydrogel obtained in the step (4) to prepare the glycan-methacrylic anhydride / calcium carbonate hydrogel slow-release coating. The method is simple in preparation process, mild and controllable in condition, good in repeatability, low in production cost and suitable for industrial production. The prepared porous network hydrogel sustained-release coating has the advantages of good biocompatibility, easiness in degradation, high load rate and the like, and has wide application prospects in the fields of medicine and chemical industry.

The present invention relates to one kind of aliphatic polyester with hydrophilic functional lateral group and its preparation and use. The aliphatic polyester is one homopolymer or copolymer with average molecular weight of 2-200 KD. It may be used biomedical material, additive for binary and multicomponent biological polymer blend and environment friendly material.