CN1304457C - Diamine modified poly-latic acid, method for preparing same and use thereof - Google Patents

Diamine modified poly-latic acid, method for preparing same and use thereof Download PDF

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CN1304457C
CN1304457C CNB021338140A CN02133814A CN1304457C CN 1304457 C CN1304457 C CN 1304457C CN B021338140 A CNB021338140 A CN B021338140A CN 02133814 A CN02133814 A CN 02133814A CN 1304457 C CN1304457 C CN 1304457C
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acid
lactic acid
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modified poly
latic
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CN1435438A (en
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王远亮
罗彦凤
潘君
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Chongqing University
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Abstract

The present invention discloses a modified diamine polylactic acid, a preparation method thereof and the application of the modified diamine polylactic acid. The modified diamine polylactic acid has the structural characteristic that A represents D-lactic acid or L-lactic acid or D, L-lactic acid; n=250 to 18000; m=2 to 6. The modified diamine polylactic acid has high hydrophilicity, is neutral in the process of degradation, does not have the characteristics of acid self-accelerator type degradation, can be used as a biodegradable medical biological material, and becomes a medical biological material, particularly a tissue engineering material with biological specificity after polypeptide and collagen are further introduced in the modified diamine polylactic acid.

Description

A kind of diamine modified poly-latic acid and its production and use
Technical field
The present invention relates to a kind of diamine modified poly-latic acid and its production and use.
Technical background
One of core content of organizational project is to make up biocompatibility, biodegradability support, serves as interim supporter in vascularization and functional organization's forming process.The ideal tissue engineering bracket material also needs the specific bio signal molecule of bonding such as polypeptide or collagen except that can being processed into complicated physical form, give the material biospecificity, and the adhesion of regulating cell, growth and differentiation make correctly functionating of cell.Poly(lactic acid) existing extensive application at aspects such as medical treatment implantation, surgical sutures, medicine controlled releasing and tissue regenerations because of its good biodegradability and biocompatibility is especially as the tissue engineering bracket material aspect.But the hydrophobicity on poly-lactic acid material surface is strong, and is poor with cellular affinity, and poly-lactic acid material shortage reactive group, is unfavorable for bio signal molecules such as its covalency introducing polypeptide and collagen.
For overcoming the above-mentioned shortcoming of poly(lactic acid), the whole bag of tricks is used to polylactic acid modified.Barrera D A, Zylstra E, Lansbury PT et al.Macrolmol., 1995,28:425-432 Langer is with the lactide dimer copolymerization that mixes dimer and lactic acid of lactic acid and Methionin poly-(lactic acid-co-Methionin), thus in poly(lactic acid) introducing-NH 2Han DK, Hubbell JA.Macromol., 1996,29:5233-5235,1997,30:6077-6083 makes glycerine end capped poly(lactic acid) in 130 ℃ with rac-Lactide and glycerine in the presence of stannous octoate, be converted into the acrylated lactic acid oligomers of three arms again with acrylate chloride, at last with the reaction of acrylated lactic acid oligomers and polyoxyethylene glycol, thus in poly(lactic acid) introducing-CH=CH-,-OH and-the COOH reactive group.John G, Morita M.Macromol., 1999,32:1853-1858 with depsipeptides and L-rac-Lactide ring-opening copolymerization after, prepare the corresponding polymkeric substance that contains the acrylate side chain with the acrylate chloride effect, thus in poly(lactic acid) introducing-CH=CH-and acid amides.These chemical modification methods have improved the wetting ability and the cellular affinity of poly(lactic acid) to a great extent, but they do not consider that the acid caused acid that produces in acidity in the material degradation process and the poly(lactic acid) degradation process causes autoacceleration build degradation behavior.
Summary of the invention
At the problems referred to above that prior art exists, the object of the present invention is to provide a kind of diamine modified poly-latic acid of novelty, and the simple and convenient process for preparing of normal condition.Another object of the present invention provides it as the purposes that is suitable for bio-medical material, especially tissue engineering bracket material.
Preparation method for diamine polydactyl acid of the present invention is as follows:
After poly(lactic acid) and cyclic acid anhydride, radical initiator mixed vacuum-drying, vacuum-sealing melting polymerization generated anhydride modified poly(lactic acid), and vacuum tightness is 0.1-50mmHg; Or be that inert protective gas is carried out the melting polymerization with nitrogen, argon gas or carbonic acid gas.Reaction times is 2-20 hour, and temperature is 50 ℃-150 ℃.The acid anhydrides consumption is 0.5%-20% (wt), and the radical initiator consumption is 0.1%-10% (wt).Under the room temperature with anhydride modified poly(lactic acid) and H 2N-(CH 2) m-NH 2(m=2-6) be dissolved in solvent respectively after, anhydride modified poly(lactic acid) drips of solution is added in two amine aqueous solutions, reacted 30 minutes-2 hours, temperature of reaction is 10 ℃-50 ℃, diamine modified poly-latic acid.Solvent is tetrahydrofuran (THF), N, dinethylformamide, methyl-sulphoxide.The concentration of anhydride modified poly(lactic acid) is/100 milliliters of 5-40 grams, and the concentration of diamines is/100 milliliters of 5-20 grams, and in 30 minutes-2 hours reaction times, temperature of reaction is 10 ℃-50 ℃.Product solution is splashed in the excessive distilled water, collect flocks, behind the redissolve-precipitation three times, to get glass transition temp be 55 ℃-59.5 ℃ in vacuum-drying under the room temperature, and the Static Water contact angle is 15 °-38 °, white or yellowish diamine modified poly-latic acid.
Described poly(lactic acid) and cyclic acid anhydride, radical initiator are mixed, its method adopts poly(lactic acid) and cyclic acid anhydride is crushed into powder back and radical initiator mixes, or after poly(lactic acid), cyclic acid anhydride, radical initiator be dissolved in solvent, fully mix, vacuum is taken out solvent then; The solvent here comprises tetrahydrofuran (THF), methylene dichloride, trichloromethane and ethyl acetate.
Said poly(lactic acid) is poly-(D-lactic acid) or poly-(L-lactic acid) or poly-(D, L-lactic acid), and molecular weight is 50000-3,000,000.
Said solvent is tetrahydrofuran (THF), N, dinethylformamide or methyl-sulphoxide.
Diamine modified poly-latic acid of the present invention can substitute poly(lactic acid) as bio-medical material, as as tissue engineering bracket material or totally biodegradable material etc., improve the wetting ability of poly(lactic acid) greatly and overcome the acidity and the corresponding acid that produce in the poly(lactic acid) degradation process causing the degraded of autoacceleration build, in degradation process, keep neutral.
And, diamine modified poly-latic acid of the present invention contain high reaction activity-NH 2With-COOH, can supply further chemical modification, introduce the bio signal molecule, as collagen and polypeptide, give the material biospecificity, become a kind of living biomaterial for medical purpose, especially tissue engineering material that biologic specificity is arranged.
Therefore, the present invention is a kind of diamine modified poly-latic acid of novelty, has than better wetting ability of prior art bibliographical information and potential cellular affinity; Having overcome the acidity of lactic acid or lactic acid oligomer and keep neutral in degradation process, do not showed acid and cause the degraded of autoacceleration build, itself is exactly a kind of biomaterial for medical purpose with good wetting ability and cellular affinity; In its structure simultaneously covalency introduced-NH 2-and-COOH, introduce bioactive moleculess such as collagen, polypeptide for further covalency, give the poly(lactic acid) biologic specificity and lay a good foundation.In addition, the Static Water contact angle of diamine modified poly-latic acid of the present invention has reduced by 15 °-35 ° with respect to poly(lactic acid).
Description of drawings
Fig. 1 is the DSC figure of diamine modified poly-latic acid, characterizes its second-order transition temperature and (represents T with the peak temperature Peak=59.0 ℃).
Fig. 2 is the infrared absorpting light spectra of poly(lactic acid) (a) and maleic anhydride modified poly(lactic acid) (b) and the difference spectrum (c) of the two.Difference is composed in (c) at 1734cm -1And 1783cm -1The feature that acid anhydrides occurred is bimodal, shows by the method for the invention successfully acid anhydrides to be incorporated in the poly(lactic acid).
Fig. 3 a and Fig. 3 b are poly(lactic acid) and maleic anhydride modified poly(lactic acid) 13C NRM spectrogram.Poly(lactic acid) (a) is compared with maleic anhydride modified poly(lactic acid) (b) and new peak: δ=15.615th occurred, the chemical shift that the methyl that links to each other with quaternary carbon produces; δ=72.311st, the chemical shift that oxygen singly-bound quaternary carbon produces; δ=169.474th, the chemical shift of acid anhydrides carbon atom shows by the method for the invention and can successfully acid anhydrides be incorporated in the poly(lactic acid).
Fig. 4 is the infrared absorpting light spectra of maleic anhydride modified poly(lactic acid) (a) and quadrol polydactyl acid (b).Diamine modified poly-latic acid (b) with respect to maleic anhydride modified poly(lactic acid) (a) at 1680cm -1The characteristic absorbance of amido linkage has appearred in the place; At 3100-3700cm -1One of occurring in place wide in the strong absorption peak N substituted amide that is diamine modified poly-latic acid, amino and-overlapping peaks of OH absorption peak, its intensity improves greatly with respect to maleic anhydride modified poly(lactic acid) (a) absorption intensity herein.This explanation can successfully be incorporated into diamines in the anhydride modified poly(lactic acid) by the method for the invention.
Fig. 5 is the contact angle figure of poly(lactic acid), maleic anhydride modified poly(lactic acid) and quadrol polydactyl acid.This figure shows that when maleic anhydride content is identical the contact angle minimum of quadrol polydactyl acid shows best wetting ability.
Fig. 6 is that poly(lactic acid) (a), maleic anhydride modified poly(lactic acid) (b) and diamine modified poly-latic acid (c) pH in degradation process changes.Poly(lactic acid) (a) maleic anhydride modified poly(lactic acid) (b) pH in degradation process all descend, and about the 4th and the 5th week, acid occurred and caused the autoacceleration signs of degradation; And corresponding diamine modified poly-latic acid (c) pH value in the degradation process in 12 weeks slightly descends (dropping to 5.85 from 6.45), illustrate diamine modified poly-latic acid overcome poly(lactic acid) and maleic anhydride modified poly(lactic acid) in degradation process acidity and do not show acid and cause the autoacceleration characteristics of degrading.
Embodiment
The maleic anhydride modified poly(lactic acid) of embodiment 1 preparation.With the poly-(D of 5.0 grams, L-lactic acid) (molecular weight is 200,000, Static Water contact angle θ=51 °) and the 0.5 gram maleic anhydride back that is crushed into powder mix with 15 milligrams of tert-butyl peroxides, vacuum-drying final vacuum melting in 48 hours is sealed in 15 milliliters the ampere bottle under the room temperature.50 ℃ of reactions got the maleic anhydride modified poly(lactic acid) of water white transparency shape in 20 hours, Static Water contact angle θ=66 ° (CQJ-93 type contact angle instrument is measured, down together).Splash in the excessive distilled water collecting precipitation after product is dissolved in 15 milliliters of tetrahydrofuran solvents.Redissolve-precipitation three times.To precipitate vacuum-drying at room temperature and get the water white refining maleic anhydride modified poly(lactic acid) of 4.2 grams in 72 hours.Static Water contact angle θ=40 °, peak temperature T is shifted in vitrifying Peak=41.7 ℃ (DSC, NETZSCH STA 449C measures, down together).
The maleic anhydride modified poly(lactic acid) of embodiment 2 preparations.With the poly-(D of 5.0 grams, L-lactic acid) (molecular weight is 2,200,000, Static Water contact angle θ=51 °) is dissolved in 50 milliliters of round-bottomed flasks that 15 milliliters of tetrahydrofuran solvents are housed with 0.5 gram maleic anhydride and 15 milligrams of peroxidation phenyl-diformyls, fully stir to make and mix vacuum-drying final vacuum sealing in 48 hours under the room temperature.Reaction got the maleic anhydride modified poly(lactic acid) of colourless or little yellow transparent shape in 10 hours under 100 ℃, Static Water contact angle θ=65 ° (CQJ-93 type contact angle instrument is measured, down together).Splash in the excessive distilled water collecting precipitation after product is dissolved in 15 milliliters of tetrahydrofuran solvents.Redissolve-precipitation three times.To precipitate vacuum-drying at room temperature and get the water white refining maleic anhydride modified poly(lactic acid) of 4.3 grams in 72 hours.Static Water contact angle θ=39 °.Peak temperature T is shifted in vitrifying Peak=41.5 ℃ (DSC, NETZSCHSTA 449C measures, down together).
Embodiment 3 preparation quadrol polydactyl acids.Poly-(D, L-lactic acid) (molecular weight is 2,200,000, Static Water contact angle θ=51 °) of 5.0 grams, 0.25 gram maleic anhydride and 2.5 milligrams of tert-butyl peroxides are dissolved in are equipped with in 50 milliliters of round-bottomed flasks of 15 milliliters of tetrahydrofuran (THF)s, fully stir to make and mix.Vacuum-drying is 72 hours under the room temperature, takes out tetrahydrofuran solvent.In 120 ℃ of reactions 6 hours, get water white maleic anhydride modified poly(lactic acid) under the nitrogen protection.Adding 100 milliliters of tetrahydrofuran solvents fully dissolves maleic anhydride modified poly(lactic acid).0.25 gram quadrol is dissolved in 5 milliliters of tetrahydrofuran (THF)s to be placed in 10 ℃ of waters bath with thermostatic control.Under agitation the tetrahydrofuran solution with maleic anhydride modified poly(lactic acid) is added dropwise in the tetrahydrofuran solution of quadrol, drips off in 25 minutes.Dropwise, be incubated after 30 minutes and be incubated 30 minutes under the room temperature again.The product drips of solution is added in the excessive distilled water, and collecting precipitation uses the distilled water thorough washing to elutant pH=6-7.5.The vacuum-drying precipitation is 72 hours under the room temperature, gets the white quadrol polydactyl acid of 4.1 grams.Second-order transition temperature Tg=55.9 ℃, Static Water contact angle θ=32 °.
Embodiment 4 preparation quadrol polydactyl acids.Poly-(D, L-lactic acid) (molecular weight is 2,200,000, Static Water contact angle θ=51 °) of 5.0 grams, 1.0 gram maleic anhydrides and 25 milligrams of tert-butyl peroxides are dissolved in 50 milliliters of round-bottomed flasks that 15 milliliters of tetrahydrofuran (THF)s are housed, and fully stirring makes and mixes.Vacuum-drying is 72 hours under the room temperature, takes out tetrahydrofuran solvent.In 150 ℃ of reactions 2 hours, get erythroid transparent maleic anhydride modified poly(lactic acid) under the nitrogen protection.Adding 25 milliliters of tetrahydrofuran solvents fully dissolves maleic anhydride modified poly(lactic acid).1.0 gram quadrols are dissolved in 5 milliliters of tetrahydrofuran (THF)s to be placed in 10 ℃ of waters bath with thermostatic control.Under agitation the tetrahydrofuran solution with maleic anhydride modified poly(lactic acid) is added dropwise in the tetrahydrofuran solution of quadrol, drips off in 25 minutes.Dropwise, be incubated 30 minutes.The product drips of solution is added in the excessive distilled water, collecting precipitation uses the distilled water thorough washing to elutant pH=6-7.5 again.The vacuum-drying precipitation is 72 hours under the room temperature, gets the little yellow quadrol polydactyl acid of 4.4 grams.Second-order transition temperature Tg=56.5 ℃ (DSC mensuration), Static Water contact angle θ=15 °
Embodiment 5 preparation butanediamine polydactyl acids.Poly-(D, L-lactic acid) (molecular weight is 2,200,000, Static Water contact angle θ=51 °) of 5.0 grams, 0.5 gram maleic anhydride and 15 milligrams of tert-butyl peroxides are dissolved in 50 milliliters of round-bottomed flasks that 15 milliliters of tetrahydrofuran (THF)s are housed, and fully stirring makes and mixes.Vacuum-drying is 72 hours under the room temperature, takes out tetrahydrofuran solvent.In 140 ℃ of reactions 15 hours, get the maleic anhydride modified poly(lactic acid) of water white transparency under nitrogen or argon gas or the carbon-dioxide protecting.Adding 25 milliliters of tetrahydrofuran solvents fully dissolves maleic anhydride modified poly(lactic acid).0.8 gram butanediamine is dissolved in 15 milliliters of tetrahydrofuran (THF)s to be placed in 25 ℃ of waters bath with thermostatic control.Under agitation the tetrahydrofuran solution with maleic anhydride modified poly(lactic acid) is added dropwise in the tetrahydrofuran solution of butanediamine, drips off in 25 minutes.Dropwise, be incubated 1.5 hours.The product drips of solution is added in the excessive distilled water, collecting precipitation uses the distilled water thorough washing to elutant pH=6-7.5 again.The vacuum-drying precipitation is 72 hours under the room temperature, gets the white butanediamine polydactyl acid of 4.2 grams.Second-order transition temperature Tg=55.9 ℃, Static Water contact angle θ=25 °.
Embodiment 6 preparation butanediamine polydactyl acids.Poly-(D, L-lactic acid) (molecular weight is 2,200,000, Static Water contact angle θ=51 °) of 5.0 grams, 1.0 gram maleic anhydrides and 30 milligrams of tert-butyl peroxides are dissolved in 50 milliliters of round-bottomed flasks that 15 milliliters of tetrahydrofuran (THF)s are housed, and fully stirring makes and mixes.Vacuum-drying is 72 hours under the room temperature, takes out tetrahydrofuran solvent.In 140 ℃ of reactions 15 hours, get the transparent maleic anhydride modified poly(lactic acid) of blush after the vacuum-sealing.Adding 25 milliliters of tetrahydrofuran solvents fully dissolves maleic anhydride modified poly(lactic acid).1.2 gram butanediamine are dissolved in 15 milliliters of tetrahydrofuran (THF)s to be placed in 25 ℃ of waters bath with thermostatic control.Under agitation the tetrahydrofuran solution with maleic anhydride modified poly(lactic acid) is added dropwise in the tetrahydrofuran solution of butanediamine, drips off in 25 minutes.Dropwise, be incubated 1.5 hours.The product drips of solution is added in the excessive distilled water, collecting precipitation uses the distilled water thorough washing to elutant pH=6-7.5 again.The vacuum-drying precipitation is 72 hours under the room temperature, gets the little yellow butanediamine polydactyl acid of 4.7 grams.Second-order transition temperature Tg=56.2 ℃, Static Water contact angle θ=19 °.
Embodiment 7 preparation hexanediamine polydactyl acids.Poly-(D, L-lactic acid) (molecular weight is 50000, Static Water contact angle θ=51 °) of 5.0 grams, 0.05 gram maleic anhydride and 5 milligrams of dibenzoyl peroxide are dissolved in 50 milliliters of round-bottomed flasks that 15 milliliters of methylene dichloride are housed, and fully stirring makes and mixes.Vacuum-drying is 72 hours under the room temperature, takes out dichloromethane solvent.In 100 ℃ of reactions 15 hours, get the maleic anhydride modified poly(lactic acid) of water white transparency after the vacuum-sealing.Add 25 milliliters of N, the dinethylformamide solvent fully dissolves maleic anhydride modified poly(lactic acid).0.1 diamines of restraining oneself is dissolved in 10 milliliters of N, and dinethylformamide is placed in 40 ℃ of waters bath with thermostatic control.Under agitation with the N of maleic anhydride modified poly(lactic acid), the dinethylformamide drips of solution adds the N of hexanediamine, in the dinethylformamide solution, drips off in 30 minutes.Dropwise, be incubated 2 hours.The product drips of solution is added in the excessive distilled water collecting precipitation.After precipitation being dissolved in 15 milliliters of tetrahydrofuran (THF)s again, splash in the excessive distilled water, collecting precipitation is precipitated to elutant pH=6-7.5 with the distilled water thorough washing.The vacuum-drying precipitation is 72 hours under the room temperature, gets the white hexanediamine polydactyl acid of 4.1 grams.Static Water contact angle θ=38 °.
Embodiment 8 preparation hexanediamine polydactyl acids.Poly-(D, L-lactic acid) (molecular weight is 3,000,000, Static Water contact angle θ=51 °) of 5.0 grams, 0.5 gram maleic anhydride and 25 milligrams of dibenzoyl peroxide are dissolved in 50 milliliters of round-bottomed flasks that 15 milliliters of methylene dichloride are housed, and fully stirring makes and mixes.Vacuum-drying is 72 hours under the room temperature, takes out dichloromethane solvent.In 100 ℃ of reactions 15 hours, get the maleic anhydride modified poly(lactic acid) of water white transparency after the vacuum-sealing.Add 25 milliliters of N, the dinethylformamide solvent fully dissolves maleic anhydride modified poly(lactic acid).1.0 diamines of restraining oneself are dissolved in 15 milliliters of N, and dinethylformamide is placed in 40 ℃ of waters bath with thermostatic control.Under agitation with the N of maleic anhydride modified poly(lactic acid), the dinethylformamide drips of solution adds the N of hexanediamine, in the dinethylformamide solution, drips off in 30 minutes.Dropwise, be incubated 1.5 hours.The product drips of solution is added in the excessive distilled water collecting precipitation.After redeposition is dissolved in 15 milliliters of tetrahydrofuran (THF)s, splash in the excessive distilled water, collecting precipitation is precipitated to elutant pH=6-7.5 with the distilled water thorough washing.The vacuum-drying precipitation is 72 hours under the room temperature, gets the white hexanediamine polydactyl acid of 4.6 grams.Static Water contact angle θ=26 °.
PH measures in embodiment 9 vitro degradation properties.Poly-(D with about 0.5 gram of weight, L-lactic acid) (molecular weight is 2,200,000, Static Water contact angle θ=51 °), maleic anhydride modified poly(lactic acid) and corresponding quadrol polydactyl acid (all by molecular weight be 2,200,000, polylactic acid modified the getting of Static Water contact angle θ=51 °) be dissolved in behind the tetrahydrofuran solvent solution casting film forming respectively in culture dish (among the diameter=20mm, height=25mm).Final vacuum drying to be filmed.The distilled water that adds 4 milliliters of pH 6.45 then, sealing places 37 ± 0.1 ℃ incubator.Use PHS-2 type acidity instrumentation pH value of solution value week about, measured for 12 weeks altogether.The result is shown in Figure of description 6.

Claims (7)

1. one kind is the method that raw material carries out modification to poly(lactic acid) with the diamines, it is characterized in that:
(1) poly(lactic acid) and cyclic acid anhydride, radical initiator are mixed vacuum-drying after, vacuum lower seal melting polymerization generates anhydride modified poly(lactic acid), vacuum tightness is 0.1-50mmHg; Or be that inert protective gas is carried out the melting polymerization with nitrogen, argon gas or carbonic acid gas; The reaction times of above-mentioned two kinds of polymerization methodses is 2-20 hour, and temperature is 50-150 ℃; Used acid anhydrides is aliphatics cyclic acid anhydride or aromatic anhydride, and consumption is 0.5%-20%wt; Used radical initiator is initiator peroxidation phenyl-diformyl commonly used or tert-butyl peroxide, and consumption is 0.1%-10%wt;
(2) with the prepared anhydride modified poly(lactic acid) of step 1, H 2N-(CH 2) m-NH 2, m=2,3,4,5 or 6, be dissolved in solvent respectively after, anhydride modified poly(lactic acid) drips of solution is added in two amine aqueous solutions, reacted 30 minutes-2 hours, temperature of reaction is 10 ℃-50 ℃, diamine modified poly-latic acid; The concentration of anhydride modified poly(lactic acid) is/100 milliliters of 5-40 grams, and the concentration of diamines is/100 milliliters of 5-20 grams;
(3) the prepared diamine modified poly-latic acid product of step 2 drips of solution is added in the excessive distilled water, collect flocculent precipitate, to elutant pH=6-7.5, vacuum-drying precipitation under the room temperature gets the refining diamine modified poly-latic acid of white or little yellow with the resulting throw out of distilled water thorough washing;
Said poly(lactic acid) is poly-(D-lactic acid) or poly-(L-lactic acid) or poly-(D, L-lactic acid), and molecular weight is 50000-3,000,000.
2. method according to claim 1, it is characterized in that: described poly(lactic acid) and cyclic acid anhydride, radical initiator are mixed, comprise poly(lactic acid) and cyclic acid anhydride be crushed into powder that the back mixes with radical initiator and poly(lactic acid), cyclic acid anhydride, radical initiator be dissolved in solvent after, fully mix, vacuum is taken out solvent then; Solvent is selected from tetrahydrofuran (THF), methylene dichloride, trichloromethane and ethyl acetate.
3. method according to claim 1 is characterized in that: said solvent is tetrahydrofuran (THF), N, dinethylformamide or methyl-sulphoxide.
4. the diamine modified poly-latic acid that adopts the method for any one qualification in the claim 1 to 3 to obtain, it is characterized in that diamine modified poly-latic acid is white or yellowish glassy polymers, its second-order transition temperature is 55 ℃-59.5 ℃, have good wetting ability, its Static Water contact angle is 15 °-38 °.
5. diamine modified poly-latic acid according to claim 4 is characterized in that keeping neutral in degradation process, do not show acid and cause autoacceleration degraded feature.
6. the purposes of the described diamine modified poly-latic acid of claim 5 is characterized in that as bio-medical material or Wholly-degradable material.
7. the purposes of diamine modified poly-latic acid according to claim 6 is characterized in that as tissue engineering bracket material or totally biodegradable material.
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