1. A water-soluble active ester polymer and a monomer thereof, characterized in that the water-soluble active ester polymer and the monomer thereof have the structural formula shown as the following formula (I), formula (II), formula (III) or formula (VI):

wherein R is fluorine atom or hydrogen atom; n is an integer of 15 to 57, and PDI is 1.01 to 1.59.

2. The monomer and active ester polymer of claim 1, comprising the steps of:

putting reactants of hydroxyl-N-oligoethylene glycol monomethyl ether amino (substituted) benzamide, an initial monomer and the like into a reaction bottle, protecting with nitrogen, adding a solvent and a catalyst, stirring and reacting. After that, the eluent is used for column chromatography to obtain the water-soluble active ester monomer. And then placing the water-soluble active ester monomer into a reaction bottle, adding an initiator or a catalyst (containing a cocatalyst) and using nitrogen for protection, adding a solvent, stirring and reacting to obtain the water-soluble active ester polymer.

3. The method of claim 2, wherein the hydroxy-N-oligoethylene glycol monomethyl ether amino (substituted) benzamide is one or more of 4-hydroxy-N-tetraethylene glycol monomethyl ether amino benzamide, 4-hydroxy-N-PEG 350 monomethyl ether amino benzamide, and 2, 3, 5, 6-tetrafluoro 4-hydroxy-N-PEG 350 monomethyl ether amino benzamide.

4. The method of claim 2, wherein the starting monomer and the like reactant is one or more of acryloyl chloride, acetylenic benzoic acid, or p-toluenesulfonyl chloride.

5. The method of claim 2, wherein the solvent of the reaction is one of dichloromethane, 1, 4-dioxane or tetrahydrofuran; the reaction time is 12-24 h; the reaction temperature is one of room temperature or 70 ℃; the catalyst is one or two of triethylamine or 4-dimethylaminopyridine; the eluent is one or more of petroleum ether, ethyl acetate, dichloromethane and methanol.

6. The method according to claim 2, wherein the molar ratio between acryloyl chloride, 4-hydroxy-N-tetraethyleneglycol monomethylether amidobenzamide, and triethylamine is 1.5: 1: 1.5, the molar ratio of the acetylenic benzoic acid, the 4-hydroxy-N-PEG 350 monomethyl ether aminobenzamide (or the 2, 3, 5, 6-tetrafluoro-4-hydroxy-N-PEG 350 monomethyl ether aminobenzamide), the triethylamine and the 4-dimethylaminopyridine is 5: 10: 1: 1.

7. the method of claim 2, wherein the water-soluble reactive monomer is one or more of 4- (N-tetraethylene glycol monomethyl ether amidocarboxamido) phenyl acrylate, 4- (N-PEG350 monomethyl ether amidobenzamide) phenyl-4-ethynylbenzoate, and 4- (N-PEG350 monomethyl ether amidobenzamide) -2, 3, 5, 6-tetrafluorophenyl-4-ethynylbenzoate.

8. The method of claim 2, wherein the initiator is azobisisobutyronitrile; the cocatalyst is triethylamine; the catalyst is 1, 5-cyclooctadiene chlororhodium dimer.

9. The method according to claim 2, wherein the molar ratio of 4- (N-tetraethylene glycol monomethyl ether carbamoylamino) phenyl acrylate to initiator is 1000: 1; the molar ratio of 4- (N-PEG350 monomethyl ether amino benzamide) phenyl-4-ethynyl benzoate (or 4- (N-PEG350 monomethyl ether amino benzamide) -2, 3, 5, 6-tetrafluorophenyl-4-ethynyl benzoate), rhodium-based catalyst and triethylamine is 50: 1.

Background

With the continuous development of society and the gradual increase of the industrialization level, the usage amount of polyolefin and poly alkyne and derivatives thereof in life and industry is increased, but the environment for our living is seriously influenced after the polyolefin and poly alkyne and the derivatives thereof are discarded into garbage; on the other hand, in the process of synthesizing the polymers, various organic reagents and heavy metal catalysts are used, so that the treatment of waste liquid is very expensive, and the serious disaster is brought to the ecological environment when the waste liquid is directly discharged into the environment. The existing method for synthesizing the polymer is mainly direct polymerization or modification by a post-functionalization method, but the method for carrying out the reaction by using water as a solvent is very few. Because water is rich in nature, the cost of waste liquid treatment can be greatly reduced by using water as a solvent to synthesize the polymer. Polymerization in aqueous solution generally requires a high catalyst, and subsequent functionalization studies have been conducted in many cases, but most are conducted in organic solvents and few in aqueous solutions, and these studies have employed sulfonates to impart water solubility to polymer precursors. Therefore, it is necessary to develop a method for synthesizing functional polymers by reaction in aqueous solution, and the method has important scientific significance and application value.

Disclosure of Invention

The primary object of the present invention is to provide a water-soluble active ester polymer and a monomer thereof.

Another object of the present invention is to provide a method for preparing the above water-soluble active ester polymer and monomers thereof.

It is a further object of the present invention to provide the use of the above water-soluble active ester polymers in post-functionalization.

The invention is realized by the following technical scheme:

1. a monomer and a water-soluble active ester polymer thereof have a structural formula shown as a formula (I), a formula (II), a formula (III) or a formula (VI):

wherein R is fluorine atom or hydrogen atom; n is an integer of 15 to 57, and PDI is 1.01 to 1.59.

2. The preparation method of the water-soluble active ester polymer monomer comprises the following preparation steps:

putting reactants of hydroxyl-N-oligoethylene glycol monomethyl ether amino (substituted) benzamide, an initial monomer and the like into a reaction bottle, protecting with nitrogen, adding a solvent and a catalyst, stirring and reacting. After that, the eluent is used for column chromatography to obtain the water-soluble active ester monomer.

Wherein, the hydroxyl-N-oligomeric ethylene glycol monomethyl ether amino (substituted) benzamide is one or more of 4-hydroxyl-N-tetraethylene glycol monomethyl ether amino benzamide, 4-hydroxyl-N-PEG 350 monomethyl ether amino benzamide and 2, 3, 5, 6-tetrafluoro 4-hydroxyl-N-PEG 350 monomethyl ether amino benzamide.

The reactant such as the initial monomer is one or more of acryloyl chloride, acetylene benzoic acid or p-toluene sulfonyl chloride.

The solvent for the reaction is dichloromethane; the reaction time is 12-24 h; the temperature of the reaction is room temperature; the catalyst is one or two of triethylamine or 4-dimethylaminopyridine; the eluent is one or more of petroleum ether, ethyl acetate, dichloromethane and methanol.

The mol ratio of the acryloyl chloride to the 4-hydroxy-N-tetraethylene glycol monomethyl ether amino benzamide to the triethylamine is 1.5: 1: 1.5, the molar ratio of the acetylenic benzoic acid, the 4-hydroxy-N-PEG 350 monomethyl ether aminobenzamide (or the 2, 3, 5, 6-tetrafluoro-4-hydroxy-N-PEG 350 monomethyl ether aminobenzamide), the triethylamine and the 4-dimethylaminopyridine is 5: 10: 1: 1.

3. the preparation method of the water-soluble active ester polymer comprises the following preparation steps:

putting the water-soluble active monomer into a reaction bottle, adding an initiator or a catalyst (containing a cocatalyst) and using nitrogen for protection, adding a solvent, stirring and reacting to obtain the water-soluble active ester polymer.

The water-soluble active monomer is one or more of 4- (N-tetraethylene glycol monomethyl ether amidoformamide) phenyl acrylate, 4- (N-PEG350 monomethyl ether amidobenzamide) phenyl-4-ethynylbenzoate and 4- (N-PEG350 monomethyl ether amidobenzamide) -2, 3, 5, 6-tetrafluorophenyl-4-ethynylbenzoate.

The initiator is azobisisobutyronitrile; the cocatalyst is triethylamine; the catalyst is 1, 5-cyclooctadiene chlororhodium dimer.

The solvent for the reaction is one of 1, 4-dioxane or tetrahydrofuran; the reaction time is 15-24 h; the temperature of the reaction is either room temperature or 70 ℃.

The molar ratio of the 4- (N-tetraethylene glycol monomethyl ether amidoformamido) phenyl acrylate to the initiator is 1000: 1; the molar ratio of 4- (N-PEG350 monomethyl ether amino benzamide) phenyl-4-ethynyl benzoate (or 4- (N-PEG350 monomethyl ether amino benzamide) -2, 3, 5, 6-tetrafluorophenyl-4-ethynyl benzoate), rhodium-based catalyst and triethylamine is 50: 1.

4. the application of the water-soluble active ester polymer in post functionalization.

5. The preparation method of the invention has the following advantages and beneficial effects:

(1) the preparation method of the invention synthesizes a novel water-soluble active ester polymer by using hydroxyl-N-oligoethylene glycol monomethyl ether amino (substituted) benzamide, acryloyl chloride and acetylene benzoic acid as raw materials, the polymer has not been reported before, and the current types of the active ester polymer with water solubility are very few, so the invention has innovativeness and important significance.

(2) The oligoethylene glycol monomethyl ether is an environment-friendly substance for both environment and organisms, so that the prepared polymer has lower toxicity and is more environment-friendly.

(3) The invention can prepare the monomer by only 1 step of reaction from the initial raw materials.

(4) The water-soluble active ester polymer prepared by the invention can be subjected to post-functionalization with amino acid in an aqueous solution, and the substitution ratio of the active ester group by the amino acid can reach as high as 92-97%, so that a new way is provided for synthesizing a functionalized polymer through post-functionalization, and the water-soluble active ester polymer has a good application prospect.

Drawings

FIG. 1 shows monomer M1 in CDCl prepared in example 1 of the present invention₃Medium nuclear magnetic resonance hydrogen spectroscopy.

FIG. 2 shows monomer P1 in CDCl prepared in example 1 of the present invention₃Medium nuclear magnetic resonance hydrogen spectroscopy.

FIG. 3 shows monomer M2 in CDCl prepared in example 2 of the present invention₃Medium nuclear magnetic resonance hydrogen spectroscopy.

FIG. 4 shows monomer P2 in CDCl prepared in example 2 of the present invention₃Medium nuclear magnetic resonance hydrogen spectroscopy.

FIG. 5 shows monomer M3 in CDCl prepared in example 3 of the present invention₃Medium nuclear magnetic resonance hydrogen spectroscopy.

FIG. 6 shows monomer P3 in CDCl prepared in example 3 of the present invention₃Medium nuclear magnetic resonance hydrogen spectroscopy.

FIG. 7 shows NMR spectra of post-functionalized products and reaction substrates in examples 4, 5 and 6 of the present invention (P1, P11, P21 and P31 as D as solvent)₂The O, P2 and P3 solvents are CDCl₃)。

Detailed Description

The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.

Example 1

The structures of the water-soluble active ester polymer and the monomer thereof of the embodiment are shown in figures P1 and M1:

the reaction equation of the water-soluble active ester polymer and the monomer thereof is as shown in the formula (I):

the preparation steps of the water-soluble polymer monomer are as follows:

taking 4-hydroxy-N-tetraethylene glycolMethylaminobenzamide (3.3g, 10mmol) was placed in a 100mL supported eggplant-shaped flask under nitrogen, then 60mL of anhydrous DCM was added with a syringe, and the reaction flask was cooled in an ice-water bath at 0 ℃. Et was then removed with a syringe₃N (2.1mL, 15mmol), and Et₃N was added to the stirring DCM solution. After DCM was cooled for 10min, acryloyl chloride (1.220mL, 15mmol) was taken out with a syringe and added slowly dropwise to the cooled DCM solution, then the reaction flask was placed in an ice-water bath for 30min before reacting at ambient temperature for 12 h. After the completion of the reaction was confirmed by dot plate (PE: EA ═ 1:2), DCM was removed by a rotary evaporator, and the crude product PE and EA were purified by silica gel chromatography using eluent (volume ratio 1:2 to 1:5) to obtain monomer M1

The yield of product monomer M1 was determined analytically to be 83%. The nuclear magnetic hydrogen spectrum of the monomer is shown in FIG. 1, and the monomer is M1, wherein delta 7.89-7.87ppm and 7.21-7.19ppm are nuclear magnetic signals of H atoms on benzene rings, delta 7.05ppm is nuclear magnetic signal of H atoms on amido bonds, delta 6.64-6.60ppm, 6.36-6.29ppm and 6.06-6.03ppm are nuclear magnetic signals of H atoms on C ═ C, delta 3.70-3.48ppm is nuclear magnetic signal of H atoms on methylene contained in the oligo-ethylene glycol unit, and delta 3.4ppm is nuclear magnetic signal of terminal methyl H atoms. The monomer is readily soluble in water at room temperature.

The preparation steps of the water-soluble polymer are as follows:

the weighed monomer M1(500mg, 1.31mmol) and AIBN (2.2mg, 0.013mmol) were placed in a test tube, 1mL of anhydrous 1, 4-dioxane was added using a pipette, and after sealing, the solution was degassed at 25 ℃ for 20min by bubbling nitrogen through it. Is charged into N₂Thereafter, the flask was immersed in a preheated oil bath at 70 ℃ for 15 h. After the reaction was completed, the branched tube was opened to expose the reaction mixture to air to terminate the polymerization. The product was diluted by adding 2mL of THF to the solution, and then purified by reprecipitation from methyl t-butyl ether to give a water-soluble active ester polymer P1.

The final product, water-soluble polymer P1, was determined analytically to have a yield of 80%, a weight average molecular weight of 29962g/mol and a molecular weight distribution of 1.36. The nuclear magnetic hydrogen spectrum of the water-soluble polymer is shown in figure 2, and the water-soluble polyacrylate P1 is determined from the figure, three groups of peaks between delta 6ppm and 7ppm disappear, so that C is disappeared, and new broad bulge peaks appear at delta 2.96ppm and delta 2.01ppm, which are nuclear magnetic peaks of H protons of carbon-carbon single bonds, and the phenomena show that C is successfully polymerized into a C-C structure. Meanwhile, the broad bulge peaks at delta 7.65ppm and 6.93ppm belong to nuclear magnetic signals of H atoms on benzene rings, and delta 3.62-2.96ppm belong to nuclear magnetic signals of-CH 2-and-CH 3 in the oligo-ethylene glycol. In addition, the water-soluble active ester polymer P1 is easily soluble in common organic solvents such as dichloromethane, chloroform, tetrahydrofuran, toluene, N-dimethylformamide and dimethyl sulfoxide at room temperature, and is easily soluble in water, which shows that the polymer has excellent solubility.

Example 2

The structures of the water-soluble active ester polymer and the monomer thereof of the embodiment are shown in figures P2 and M2:

the reaction equation of the water-soluble active ester polymer and the monomer thereof is as shown in the formula (I):

the preparation steps of the water-soluble polymer monomer are as follows:

4-hydroxy-N-PEG 350 monomethyl ether amino benzamide (4.66g, 9.9mmol), 4-acetylenyl benzoic acid (2.92g, 20mmol), DCC (4.13g, 20mmol), DMAP (244mg, 2mmol) and p-toluenesulfonyl chloride (381mg, 2mmol) are taken to be put in a 250mL eggplant-shaped bottle, nitrogen is used for protection reaction, the eggplant-shaped bottle is put in an ice water bath at 0 ℃ for cooling for 20min, and then 100mL of anhydrous DCM is added by a syringe. After 1h of reaction, the reaction was carried out for a further 23h at ambient temperature. After confirming that the reaction was completed with a dot plate (DCM: MeOH ═ 50:1), the organic solvent DCM was removed with a rotary evaporator, and the crude product was precipitated with DCM and MeOH as an eluent (volume ratio 40:1 to 50:1) on silica gel to obtain a yellowish brown liquid material. Then adding a small amount of methyl tert-butyl ether, heating and stirring for 10min to fully dissolve the product, filtering the insoluble substance by using a sand core suction filter funnel, and removing the methyl tert-butyl ether from the filtrate by rotary evaporation to obtain the monomer M2.

The yield of product monomer M2 was determined analytically to be 81%. The nuclear magnetic hydrogen spectrum of the monomer is shown in FIG. 3, and the monomer can be determined to be M2, delta 8.17-8.15ppm, 7.93-7.91ppm, 7.64-7.62ppm and 7.30-7.28ppm of nuclear magnetic signals of H atoms on benzene rings, delta 7.00ppm of nuclear magnetic signals of H atoms on amide bonds, delta 3.69-3.52ppm of nuclear magnetic signals of H atoms on methylene on PEG350 units, delta 3.37-3.34ppm of nuclear magnetic signals of terminal methyl H atoms and delta 3.29ppm of nuclear magnetic signals of H atoms on ethinyl groups. The monomer is slightly soluble in water at room temperature.

The preparation steps of the water-soluble polymer are as follows:

the weighed monomer M2(179mg, 0.3mmol) was placed in a test tube, the reaction was protected with nitrogen, and 1.5mL of anhydrous THF was injected using a syringe. During the degassing process, 1, 5-cyclooctadienechlororhodium dimer ([ Rh (cod) Cl) was weighed]₂3.0mg, 0.006mmol) in another test tube, the tube was filled with N in the same manner₂Then 1mL of anhydrous THF and 0.2mL of Et were added via syringe₃N and stirring for 15 min. The Rh catalyst-containing THF solution was then transferred to a monomeric THF solution using a syringe, and a rapid darkening of the solution was observed. After 24h reaction at ambient temperature the tube was opened and the reaction was quenched by the addition of 2mL THF. Then, the mixture was reprecipitated with ether and purified to obtain a water-soluble active ester polymer P2.

The final product, water-soluble polymer P2, was determined analytically to have a yield of 73%, a weight average molecular weight of 23222g/mol and a molecular weight distribution of 1.08. The nuclear magnetic hydrogen spectrum of the water-soluble polymer is shown in figure 4, the water-soluble polyphenylacetylene ester P2 can be determined from the figure, nuclear magnetic signals belonging to H atoms on ethynyl groups at delta 3.29ppm disappear, the product does not contain monomers of ethynyl groups, and broad peak signals at 8.59ppm, 8.09-7.74ppm and 7.49-7.40ppm indicate that the product contains two benzene ring structures, which are consistent with the molecular structure of the polymer, and the same broad peaks appear at 3.50ppm and 3.24ppm, which belong to methylene H atoms and methyl H atoms on PEG350 monomethyl ether respectively. The absence of the peak of the signal of the H atom at the carbon-carbon double bond may be due to too low a polymer content in the sample tested, or due to too strong a signal at 5.76ppm of solvent DCM masking the absorption of the H atom at the carbon-carbon double bond. In addition, the water-soluble active ester polymer P2 is easily soluble in common organic solvents such as dichloromethane, chloroform, tetrahydrofuran, N-dimethylformamide, dimethylsulfoxide, and the like at room temperature, indicating excellent solubility, but is only slightly soluble in water.

Embodiment 3

The structures of the water-soluble active ester polymer and the monomer thereof of the embodiment are shown in figures P3 and M3:

the reaction equation of the water-soluble active ester polymer and the monomer thereof is as shown in the formula (I):

the preparation steps of the water-soluble polymer monomer are as follows:

taking 2, 3, 5, 6-tetrafluoro 4-hydroxy-N-PEG 350 monomethyl ether amino benzamide (4.5g, 8.2mmol), 4-acetylenyl benzoic acid (2.48g, 17mmol), DCC (3.50g, 17mmol), DMAP (208mg, 1.7mmol) and p-toluenesulfonyl chloride (324mg, 1.7mmol) in a 250mL eggplant-shaped bottle, and circulating three times in a vacuum-blowing nitrogen manner to fill the bottle with N₂The eggplant-shaped bottle was placed in an ice-water bath at 0 ℃ to cool for 20min, and then 100mL of anhydrous DCM was added using a syringe. After 1h of reaction, the reaction was carried out for a further 23h at ambient temperature. After confirming that the reaction was completed, the organic solvent DCM was removed by a rotary evaporator, and the crude product was precipitated with DCM and MeOH as an eluent (volume ratio 70:1 to 100:1) on silica gel to obtain a yellowish brown liquid material. Adding a small amount of methyl tert-butyl ether, heating and stirring for 10min to dissolve the product, filtering the insoluble substance with sand core suction filter funnelAnd removing methyl tert-butyl ether from the filtrate by rotary evaporation to obtain the monomer M3.

The yield of product monomer M3 was determined analytically to be 87%. The nuclear magnetic hydrogen spectrum of the monomer is shown in figure 5, and the monomer can be determined to be M3, delta 8.17-8.16ppm, 7.66-7.64ppm are nuclear magnetic signals of H atoms on a benzene ring, delta 7.17ppm is nuclear magnetic signal of H atoms on an amido bond, delta 3.70-3.54ppm is nuclear magnetic signal of H atoms on methylene on PEG350 unit, delta 3.37-3.35ppm is nuclear magnetic signal of terminal methyl H atoms, and delta 3.33ppm is nuclear magnetic signal of H atoms on an ethynyl group. The monomer is slightly soluble in water at room temperature.

The preparation steps of the water-soluble polymer are as follows:

the weighed monomer M3(179mg, 0.3mmol) was placed in a test tube, the reaction was protected with nitrogen, and 1.5mL of anhydrous THF was injected using a syringe. During the degassing process, 1, 5-cyclooctadienechlororhodium dimer ([ Rh (cod) Cl) was weighed]₂3.0mg, 0.006mmol) in another test tube, the tube was filled with N in the same manner₂Then 1mL of anhydrous THF and 0.2mL of Et were added via syringe₃N and stirring for 15 min. The Rh catalyst-containing THF solution was then transferred to a monomeric THF solution using a syringe, and a rapid darkening of the solution was observed. After 24h reaction at ambient temperature the tube was opened and the reaction was quenched by the addition of 2mL THF. Then, the mixture was reprecipitated with ether and purified to obtain a water-soluble active ester polymer P3.

The final product, water-soluble polymer P3, was determined analytically to have a yield of 75%, a weight average molecular weight of 10449g/mol and a molecular weight distribution of 1.04. The nuclear magnetic hydrogen spectrum of the water-soluble polymer is shown in figure 6, the water-soluble polyphenylacetylene ester P3 can be determined from the figure, nuclear magnetic signals belonging to H atoms on ethynyl groups at delta 3.00ppm disappear, the product does not contain monomers of ethynyl groups, broad-peak signals at 8.47-7.10ppm indicate that the product contains a benzene ring structure with H atoms, the benzene ring structure is consistent with the molecular structure of the polymer, and the broad peaks appear at 3.50ppm and 3.24ppm, which belong to methylene H atoms and methyl H atoms on PEG350 monomethyl ether respectively. In addition, several groups of weak sharp nuclear magnetic signals were observed at 7-8ppm, indicating that the polymer also contained a small amount of monomer or oligomer with a low degree of polymerization. The absence of the peak of the signal of the H atom at the carbon-carbon double bond may be due to too low a polymer content in the sample tested, or due to too strong a signal at 5.76ppm of solvent DCM masking the absorption of the H atom at the carbon-carbon double bond. The water-soluble active ester polymer P2 is easily soluble in common organic solvents such as dichloromethane, chloroform, tetrahydrofuran, N-dimethylformamide, dimethyl sulfoxide and the like at room temperature, and shows excellent solubility, but is only slightly soluble in water.

Example 4

Use of water-soluble active ester polymers in post-functionalization. The reaction equation of the water-soluble active ester polymer and the glycine is as shown in the formula (IV):

taking polymer P1(80mg, 0.21mmol) and placing in 25ml eggplant-shaped bottle, adding 15ml deionized water, stirring at room temperature for 20min, then adding glycine (47mg, 0.63mmol) and Et in sequence₃N (88. mu.L, 0.63mmol), 4-dimethylaminopyridine (DMAP, 77mg, 0.63mmol), sealed eggplant-shaped bottles, and reacted at room temperature for 24 hours. After the reaction was complete, the reaction was transferred to a dialysis bag (molecular weight cut-off 500) using a disposable pipette, dialyzed against deionized water for 24h and transferred to a 20mL glass vial, and the water was removed by lyophilization to give the product glycine-functionalized polyacrylamide P11 as a white solid.

The product of the post-functionalization is characterized by nuclear magnetic hydrogen spectroscopy and compared with the substrate before the reaction (see FIG. 7), it can be seen that a new peak appears at 4-4.5ppm, which belongs to the hydrogen on the carbon atom linking the amino group and the carboxyl group of the amino acid, so it can be confirmed that the reaction has occurred as we expected. The integration showed that the substitution rate of glycine for the active ester moiety was 97%.

Example 5

Use of water-soluble active ester polymers in post-functionalization. The reaction equation of the water-soluble active ester polymer and the glycine is as shown in the formula (V):

taking polymer P2(50mg, 0.08mmol) to a 25mL eggplant-shaped bottle, adding 15mL deionized water, stirring at room temperature for 20min, and then sequentially adding proline (28mg, 0.24mmol) and Et₃N (34. mu.L, 0.63mmol), DMAP (29mg, 0.63mmol), the eggplant-shaped bottle was sealed, and then the reaction was carried out at room temperature for 24 hours. Then the reaction mixture solution is transferred into a dialysis bag (molecular weight cut-off is 500) by a disposable pipette, dialyzed with deionized water for 24h and then transferred into a 20mL glass bottle, and water is removed by freeze drying to obtain the product proline functionalized polyacetylene benzamide P21 in red solid

The product of the post-functionalization is characterized by nuclear magnetic hydrogen spectroscopy and compared with the substrate before the reaction (see FIG. 7), it can be seen that a new peak appears at 4-4.5ppm, which belongs to the hydrogen on the carbon atom linking the amino group and the carboxyl group of the amino acid, so it can be confirmed that the reaction has occurred as we expected. Integration showed that the rate of substitution of the active ester moiety by proline was 93%.

Example 6

Use of water-soluble active ester polymers in post-functionalization. The reaction equation of the water-soluble active ester polymer and the glycine is shown as the formula (six):

taking polymer P3(54mg, 0.08mmol) to a 25mL eggplant-shaped bottle, adding 15mL deionized water, stirring at room temperature for 20min, and then adding proline (28mg, 0.24mmol) and Et sequentially₃N (34. mu.L, 0.63mmol), DMAP (29mg, 0.63mmol), the eggplant-shaped bottle was sealed, and then the reaction was carried out at room temperature for 24 hours. The reaction mixture was then transferred to a dialysis bag (molecular weight cut-off 500) using a disposable pipette, dialyzed against deionized water for 24h and transferred to a 20mL glass vial, and the water was removed by freeze-drying to give the product as a red solidProline functionalized polyacetylene benzamide P31

The product of the post-functionalization is characterized by nuclear magnetic hydrogen spectroscopy and compared with the substrate before the reaction (see FIG. 7), it can be seen that a new peak appears at 4-4.5ppm, which belongs to the hydrogen on the carbon atom linking the amino group and the carboxyl group of the amino acid, so it can be confirmed that the reaction has occurred as we expected. Integration showed that the rate of substitution of the active ester moiety by proline was 92%.

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.