Poly(3-hydroxypropionic acid) polymer and its manufacturing method

Abstract

The present invention relates to a poly(3-hydroxypropionic acid) polymer containing a novel network structure and a method for producing the same.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0055419, filed April 27, 2023, and Korean Patent Application No. 10-2024-0055648, filed April 25, 2024, and all contents disclosed in the documents of said Korean patent applications are incorporated herein by reference.

[0002] The present invention relates to a poly(3-hydroxypropionic acid) polymer containing a novel network structure and a method for producing the same. [Background technology]

[0003] Poly(3-hydroxypropionic acid) has biodegradable properties, and due to its environmentally friendly properties, research using it has been actively conducted recently.

[0004] There are two main methods for producing poly(3-hydroxypropionic acid): one is a petrochemical-based method using β-propiolactone (PL) for polymerization, and the other is a bio-based method using 3-hydroxypropionic acid (3HP).

[0005] When PL is used, several synthesis steps using ethylene oxide must be performed, which is economically disadvantageous compared to the use of 3HP.

[0006] In the case of polymerization using biosynthesis of 3HP, various steps such as freeze-drying, ultra-sonication, and solvent elution must be performed to obtain poly(3-hydroxypropionic acid), which requires the use of large amounts of solvent. In the case of biosynthesis polymerized in this way, the biocontent of poly(3-hydroxypropionic acid) is 100%, but the residues remaining after fermentation contain a large amount of organic nitrogen, resulting in a high YI.

[0007] To solve this problem, attempts have been made to polycondense 3HP, but the production of high-molecular-weight poly(3-hydroxypropionic acid) is limited by the presence of cyclic oligomers as by-products. Attempts have also been made to increase the molecular weight by ROP of low-molecular-weight cyclic oligomers, but separation and purification are difficult.

[0008] Furthermore, in order for such poly(3-hydroxypropionic acid) polymers to be used in a wider variety of products, there is a demand for a technology for synthesizing them so that they have novel structures that provide excellent physical properties.

[0009] Therefore, there is a need for a method for producing poly(3-hydroxypropionic acid) by condensation polymerization of 3HP, which has excellent physical properties and a novel structure that can be easily applied to a range of products. Summary of the Invention [Problem to be solved by the invention]

[0010] The present invention provides a poly(3-hydroxypropionic acid) polymer having a novel network structure.

[0011] The present invention also provides a method for producing the poly(3-hydroxypropionic acid) polymer. [Means for solving the problem]

[0012] Poly(3-hydroxypropionic acid) polymer In order to solve the above problems, according to one embodiment of the present invention, there is provided a poly(3-hydroxypropionic acid) polymer comprising a plurality of repeating units derived from 3-hydroxypropionic acid, represented by the following chemical formula 1, in which the end group of any one of the repeating units is bonded to the end group of another repeating unit via a reactive monomer, thereby forming a network structure, and having an alpha value of 0.4 to 0.8 as measured by a multi-angle light scattering (MALS) detector: [ka]

[0013] The term "poly(3-hydroxypropionic acid)" used in the present invention refers to a polymer containing repeating units derived from 3-hydroxypropionic acid, specifically, a polymer containing repeating units represented by Chemical Formula 1 above.

[0014] Poly(3-hydroxypropionic acid) polymers have biodegradable properties due to the molecular structure of the repeating units. Furthermore, the poly(3-hydroxypropionic acid) of the present invention is characterized by having a novel network structure obtained by polymerizing 3-hydroxypropionic acid with a reactive monomer under specific conditions, as described below.

[0015] The term "network structure" used in the present invention may refer to a network structure that includes at least two branched structures formed by the bonding of at least three repeating units, and is distinguished from a branched structure or a hyperbranched structure that has multiple branched structures.

[0016] The novel network-structured poly(3-hydroxypropionic acid) polymer has the appropriate molecular weight characteristics and can exhibit a high degree of crosslinking and appropriate elasticity. While polymers with a high degree of crosslinking are generally prone to breakage, the novel network-structured polymer of the present invention has less breakage due to the voids in the network structure, making it easier to apply to a variety of products.

[0017] Specifically, the poly(3-hydroxypropionic acid) polymer according to one embodiment of the present invention forms a novel network structure by bonding an end group of any one of the repeating units represented by Chemical Formula 1 to an end group of another repeating unit via a reactive monomer.

[0018] According to one embodiment of the present invention, the poly(3-hydroxypropionic acid) polymer having the novel network structure comprises a plurality of repeating units represented by Chemical Formula 1, wherein the end group of any one of the repeating units is bonded to the end group of another repeating unit via a reactive monomer to form the novel network structure.

[0019] Here, the term "end group of a repeating unit" refers to an end group derived by the reaction of 3-hydroxypropionic acid, which is a unit monomer constituting the repeating unit, with a reactive monomer.

[0020] The alpha value of the poly(3-hydroxypropionic acid) polymer measured by multi-angle light scattering (MALS) is 0.4 to 0.8, preferably 0.5 to 0.8. By satisfying this range, the desired network structure can be obtained. This allows the present invention to be manufactured into various molded products, and particularly when manufactured into foams, the network structure supports the foam, allowing it to maintain its shape even after final processing.

[0021] The alpha value measured by multi-angle light scattering (MALS) is an index that can identify polymer structure. The alpha value refers to a constant value of the Mark-Houwink equation derived by MALS. An alpha value outside the above range, approaching 1, is undesirable because it indicates that the polymer structure is close to linear. Furthermore, in a crosslinked structure, an alpha value that is too low outside the above range can cause gelation, resulting in reduced processability and mechanical properties. This can make it difficult to maintain the shape of the final polymer in a foam form, making it difficult to apply to a variety of products. Specific measurement methods will be described in more detail in the experimental examples below.

[0022] The reactive monomer may contain one or more reactive terminal substituents selected from the group consisting of a hydroxyl group (-OH), a carboxyl group (-COOH), an amino group (-NH), a cyano group (-CN), a thiol group (-SH), and an isocyanate group (-N=C=O). Preferably, the reactive monomer may be a polyfunctional monomer containing multiple reactive terminal substituents, which facilitates the formation of a novel network structure.

[0023] The reactive monomer is polyC 1-60 Alkylene polyol or C 1-60 alkyl dicarboxylic acids, or poly C 1-60 Alkylene polyol and C 1-60 Alkyl dicarboxylic acids can be used simultaneously.

[0024] wherein the polyC 1-60 Alkylene polyols include glycerol and 3-arm-poly(ethylene glycol). n=2~15 , 4-arm-poly(ethylene glycol) n=2~10 Examples of the sugars that can be used include, but are not limited to, one or more selected from the group consisting of erythritol, pentaerythritol, di(trierythritol propane), xylitol, sorbitol, tripentaerythritol, inositol, and β-cyclodextrin.

[0025] Also, the above C 1-60 Examples of alkyl dicarboxylic acids include, but are not limited to, one or more selected from the group consisting of malonic acid, succinic acid, adipic acid, 1,3,5-benzenetricarboxylic acid, 1,3,5-triazine-2,4,6-tricarboxylic acid, citric acid, and 2,2-bis(hydroxymethyl)butyric acid.

[0026] According to one embodiment of the invention, the poly(3-hydroxypropionic acid) polymer may have the following structure, but is not limited thereto: [ka]

[0027] In the above structure, R1 and R2 can represent structures derived from reactive monomers. n may be 1-100.

[0028] The poly(3-hydroxypropionic acid) polymer has a melting temperature (Tm) of 50 to 70° C. More preferably, Tm is 51° C. or higher, 52° C. or higher, and 68° C. or lower, 67° C. or lower, or 51 to 68° C. or 52 to 67° C. Satisfying the above thermal properties is advantageous in achieving the intended effects.

[0029] The poly(3-hydroxypropionic acid) polymer may have a melting temperature (Tm) of 50 to 70° C., and the sum of enthalpies (ΔH) in that range may be less than 50 J / g.

[0030] Preferably, the polydispersity index (PDI) of the poly(3-hydroxypropionic acid) polymer is 3.0 to 20.0, more preferably 3.1 or more, 3.3 or more, 3.5 or more, 4.0 or more, or 5.0 or more, and 19.5 or less, 19.4 or less, 19.0 or less, 18.0 or less, or 16.0 or less.

[0031] Preferably, the weight-average molecular weight (Mw) of the poly(3-hydroxypropionic acid) polymer is 2,000 to 100,000. More preferably, Mw is 3,000 or more, 4,000 or more, 5,000 or more, 5,100 or more, 5,500 or more, 7,000 or more, or 9,000 or more, and 90,000 or less, 70,000 or less, 50,000 or less, 30,000 or less, 25,000 or less, 23,000 or less, 20,000 or less, 17,000 or less, 15,000 or less, or 13,000 or less.

[0032] Preferably, the number average molecular weight (Mn) of the poly(3-hydroxypropionic acid) polymer is 500 to 50,000. More preferably, Mn is 700 or more, 900 or more, 1,000 or more, 1,500 or more, or 3,000 or more, and 30,000 or less, 15,000 or less, 10,000 or less, 9,000 or less, 7,000 or less, 5,000 or less, or 4,500 or less.

[0033] Method for producing poly(3-hydroxypropionic acid) polymer Meanwhile, according to one embodiment of the present invention, there is provided a method for producing the aforementioned poly(3-hydroxypropionic acid) polymer, which can be produced from 3-hydroxypropionic acid, which can be produced by biosynthesis.

[0034] Therefore, preferably, the poly(3-hydroxypropionic acid) may have a biocontent of 90% or more. The biocontent can be determined by graphitizing a sample to be measured and then analyzing the content of the radioactive isotope C (bio-derived) according to ASTM D6866-22.

[0035] More specifically, the method for producing poly(3-hydroxypropionic acid) polymer includes a first step of polymerizing 3-hydroxypropionic acid and a reactive monomer to form an oligomer; and a second step of polymerizing the oligomer to produce a poly(3-hydroxypropionic acid) polymer having a network structure.

[0036] At this time, the poly(3-hydroxypropionic acid) polymer having the novel network structure described above can be prepared by adjusting the preparation conditions of Steps 1 and 2. The above-mentioned descriptions regarding the 3-hydroxypropionic acid and reactive monomers used herein are all equally applicable.

[0037] (Stage 1) Step 1 is a step of melt-polymerizing 3-hydroxypropionic acid and reactive monomers to produce an oligomer. The melt-polymerization means that the reactants, 3-hydroxypropionic acid and reactive monomers, and the resulting oligomer are maintained in a liquid state.

[0038] The reactive monomer functions to link multiple repeating units formed by 3-hydroxypropionic acid so that the polymer can form a new network.

[0039] The reactive monomer may contain one or more reactive terminal substituents selected from the group consisting of a hydroxyl group (-OH), a carboxyl group (-COOH), an amino group (-NH), a cyano group (-CN), a thiol group (-SH), and an isocyanate group (-N=C=O). Preferably, the reactive monomer may be a polyfunctional monomer containing multiple reactive terminal substituents, which facilitates the formation of a novel network structure. The specific types of the reactive monomer are the same as those described above.

[0040] Preferably, the reactive monomer is polyC 1-60 Alkylene polyol or C 1-60 The alkyl dicarboxylic acid may comprise one or more of the following: poly C 1-60 Alkylene polyol and C 1-60 The polyC may also contain an alkyl dicarboxylic acid. 1-60 Alkylene polyol and C 1-60 The specific types of alkyl dicarboxylic acids are all equally applicable to those described above.

[0041] Poly C 1-60 The alkylene polyol may be contained in an amount of 0.1 to 15 mol %, preferably 0.5 to 10 mol %, based on 100 mol of 3-hydroxypropionic acid. 1-60The alkyl dicarboxylic acid may be contained in an amount of 0.01 to 10 mol %, preferably 0.25 to 5 mol %, relative to 100 mol of 3-hydroxypropionic acid. By using each reactive monomer in the above content range, it is easy to form a novel network structure.

[0042] Step 1 may be carried out by controlling the reaction temperature to a temperature of 80° C. to 100° C. Preferably, the reaction temperature in Step 1 is 81° C. or higher, 82° C. or higher, 83° C. or higher, 84° C. or higher, or 85° C. or higher, and 99° C. or lower, 98° C. or lower, 97° C. or lower, 96° C. or lower, or 95° C. or lower.

[0043] Also, step 1 may be performed at a pressure of 5 torr to 20 torr. Preferably, step 1 is performed at a pressure of 6 torr or more, 7 torr or more, 8 torr or more, or 9 torr or more, and 19 torr or less, 18 torr or less, 17 torr or less, 16 torr or less, or 15 torr or less.

[0044] The reaction time of the step 1 can be appropriately determined in consideration of the molecular weight of the oligomer produced, the yield, etc., and is preferably 1 to 3 hours.

[0045] Preferably, Step 1 is carried out in the presence of a sulfonic acid catalyst. Preferably, the sulfonic acid catalyst is p-toluenesulfonic acid, m-xylene-4-sulfonic acid, 2-mesitylenesulfonic acid, or p-xylene-2-sulfonic acid. The catalyst is used in a ratio of 0.1 to 0.5 mol % based on 3-hydroxypropionic acid.

[0046] (Stage 2) Step 2 of the present invention is a step of further polymerizing the oligomer of Step 1 to prepare a poly(3-hydroxypropionic acid) polymer having a novel network structure.

[0047] Unlike step 1, step 2 can be carried out at a lower pressure since the reactants are oligomers.

[0048] Preferably, the reaction temperature in Step 2 may be adjusted to 75° C. to 95° C. More preferably, the reaction temperature in Step 2 is 80° C. or higher, or 85° C. or higher, and 94° C. or lower, 93° C. or lower, 92° C. or lower, or 91° C. or lower.

[0049] Preferably, the reaction pressure in Step 2 may be 5 torr or less. More preferably, the pressure in Step 2 is 4 torr or less, 3 torr or less, 2 torr or less, 1 torr or less, 0.5 torr or less, 0.4 torr or less, or 0.3 torr or less, and is 0.01 torr or more, 0.02 torr or more, 0.03 torr or more, 0.04 torr or more, 0.05 torr or more, 0.06 torr or more, 0.07 torr or more, 0.08 torr or more, 0.09 torr or more, or 0.1 torr or more.

[0050] The reaction time of the step 2 can be appropriately determined in consideration of the molecular weight and yield of the poly(3-hydroxypropionic acid) polymer to be produced, and is preferably 5 to 30 hours.

[0051] Preferably, the combined time of Step 1 and Step 2 is 7 to 30 hours, more preferably 7 to 24 hours.

[0052] Meanwhile, since step 2 is performed following step 1, the catalyst added in step 1 also participates in the reaction in step 2. Therefore, the catalyst described in step 1 can also be applied to step 2.

[0053] According to one embodiment of the present invention, the second step may be carried out by additionally adding a tin-based catalyst. Preferably, the tin-based catalyst is SnCl2 or Sn(oct)2. The catalyst is used in a ratio of 0.001 to 0.5 mol% based on 3-hydroxypropionic acid.

[0054] Meanwhile, if necessary, the 3-hydroxypropionic acid and the reactive monomer may be independently pretreated at 30°C to 100°C and 30 mbar to 150 mbar before carrying out Steps 1 and 2. The pretreatment step can remove moisture present in the 3-hydroxypropionic acid and the reactive monomer.

[0055] The novel network-structured poly(3-hydroxypropionic acid) polymer prepared by the above-described method has appropriate molecular weight characteristics and can exhibit appropriate elasticity while having a high degree of crosslinking. While polymers with a high degree of crosslinking typically have brittle properties, the novel network-structured polymer of the present invention has less brittleness due to the void spaces within the network structure, making it easier to apply to a variety of products. [Effects of the Invention]

[0056] As described above, the present invention can provide a poly(3-hydroxypropionic acid) polymer having a novel network structure by polymerizing 3-hydroxypropionic acid with a reactive monomer under specific conditions. [Brief explanation of the drawings]

[0057] [Figure 1] 1 shows photographs of molded articles produced from the polymers of Examples and Comparative Examples, evaluating the shape over time. DETAILED DESCRIPTION OF THE INVENTION

[0058] Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the following examples are merely illustrative of the present invention, and the present invention is not limited to these examples.

[0059] [Examples and Comparative Examples] Example 1 (Stage 1) Dehydrated 3-hydroxypropionic acid (70 g), 7.156 g of reactive monomer glycerol (A: 10 mol% relative to 3-HP), and 4.59 g of succinic acid (B: 5 mol% relative to 3-HP) were placed in a reactor, and 295.6 mg of catalyst p-TSA (p-toluenesulfonic acid) (0.2 mol% relative to 3-HP) was added. The temperature and pressure in the reactor were maintained at 90°C and 10 mbar (7.5 torr), respectively, and the reaction was carried out for 2 hours to produce an oligomer.

[0060] (Stage 2) Next, the temperature and pressure in the reactor were adjusted to 80°C and 0.1 torr, respectively, and 157.4 mg of SnOct2 (0.05 mol% relative to 3-HP) was added as an additional catalyst. The reaction was continued for an additional 5 hours to produce a network-structured poly(3-hydroxypropionic acid) polymer.

[0061] Examples 2 to 11 The same method as in Example 1 was used to prepare a network-structured poly(3-hydroxypropionic acid) polymer, but the reaction conditions were changed as shown in Table 1 below.

[0062] Comparative Example 1 (Stage 1) 60 g of dehydrated 3-hydroxypropionic acid was placed in a reactor, and 253.4 mg of p-TSA (p-toluenesulfonic acid) (0.2 mol% relative to 3-HP) was added as a catalyst. The temperature and pressure in the reactor were maintained at 90°C and 10 mbar (7.5 torr), respectively, and the reaction was carried out for 2 hours to produce 3-hydroxypropionic acid oligomers.

[0063] (Stage 2) Next, the temperature and pressure in the reactor were adjusted to 80° C. and 0.1 torr, respectively, and the reaction was carried out for 5 hours to produce a poly(3-hydroxypropionic acid) polymer.

[0064] Comparative Examples 2 and 3 Poly(3-hydroxypropionic acid) polymer was produced in the same manner as in Comparative Example 1, except that the reaction conditions were changed as shown in Table 1 below.

[0065] Comparative Example 4 (Step 1) 70 g of dried 3-hydroxypropionic acid (3HP) and 7.156 g of glycerol (10 mol% relative to 3HP) were placed in a reactor, and oligomerization was carried out for 2 hours at 90°C and 10 mbar (7.5 torr) using 295.6 mg of p-TSA (0.2 mol% relative to 3HP) as a catalyst.

[0066] (Step 2) At a vacuum of 0.1 torr, 157.4 mg of Sn(Oct)2 (0.05 mol% relative to 3HP) was added as a cocatalyst and an additional polymerization reaction was carried out for 5 hours to produce a branched polymer.

[0067] [Experimental Example 1 - Polymer property evaluation] The physical properties of the polymers prepared in the above examples and comparative examples were evaluated by the following methods. 1) Weight average molecular weight and molecular weight distribution The weight average molecular weight, number average molecular weight, and polydispersity index of the polymers prepared in the examples and comparative examples were measured by gel permeation chromatography (GPC, Waters Alliance e2695), and the results are shown in Table 1 below. -Solvent: chloroform (eluent) -Flow rate: 1.0ml / min -Column temperature: 40℃ -Standard: Polystyrene

[0068] 2) Measurement of Alpha value using a multi-atomic light scattering detector (MALS) The alpha values ​​of the polymers produced in the above examples and comparative examples were measured using a multi-atom array light scattering detector (MALS), and the results are shown in Table 1 below.

[0069] First, the polymer was dissolved in chloroform (standardized with ETOH) at a concentration of 5 mg / mL to prepare a sample. The mobile phase was prepared by filtering 1000 mL of chloroform (standardized with ETOH) using a solvent clarification system. The radius of gyration (Rg) of the solvated chain of the polymer was measured using a multi-atom array light scattering detector (MALS), and a plot of intrinsic viscosity (η) versus absolute molecular weight (M) was then derived. The constant alpha (α) was calculated using the Mark-Houwink equation (Equation 1), and the results are shown in Table 1 below.

[0070] -RI (refractive index) measurement: DAWN8 (manufacturer: Wyatt) -Viscometer (viscosity) measurement: Viscostar III (manufacturer: Wyatt) -Light scattering measurement: Optilab T-rEX (manufacturer: Wyatt) -Stationary phase: 2x Agilent PLgel MIXED-B and C, 7.5x300mm, 5μm Mobile phase: chloroform (standardized with ETOH) = 100 (v / v, %) -Flow rate: 1.0mL / min -Stationary phase temperature: 40℃ Injection volume: 100 μl (0.45 μm filtered) -Analysis time: 35 minutes - System calibration: Polystyrene (Mp: 135700) -Chloroform Refractive index:1.45

[0071] [Formula 1] log[η]=αlogM+logK In the above formula 1, [η] is the intrinsic viscosity (dl / g) of the polymer, M is the absolute molecular weight (MW) of the polymer, K is a constant. [Table 1]

[0072] 3) DSC (differential scanning calorimetry) thermal property evaluation The thermal properties (Tg, Tm, cold crystallization (result of second heating), Tc (result of first cooling), and total enthalpy (ΔH)) of the polymers prepared in the examples and comparative examples were measured under nitrogen gas flow conditions using a TA DSC250 model instrument, and the results are shown in Table 2 below.

[0073] Heat from 40℃ to 190℃ at 5℃ / min (1st heating) / Maintain temperature at 190℃ for 10 minutes Cooling from 190℃ to -60℃ at 5℃ / min (1st cooling) / Maintain temperature at -60℃ for 10 minutes -60℃~190℃ at 5℃ / min (2nd heating) [Table 2]

[0074] In general, the faster the crystallization rate, the larger the enthalpy of Tc, and the less or no cold crystallization, and the higher the degree of crystallinity, the larger the enthalpy of Tm can be.

[0075] Furthermore, although a high degree of crystallinity increases the strength of a material, it also tends to be brittle and lacks elasticity. However, in the case of a novel network structure such as that of the present invention, it has been confirmed that the brittleness can be reduced by lowering the degree of crystallinity.

[0076] [Experimental Example 2 - Polymer Shape Evaluation] Final products were produced from the polymers produced in the above Examples and Comparative Examples by the following method, and their shapes were evaluated.

[0077] First, samples were prepared by dissolving each of the polymers of Example 1 and Comparative Example 4 in chloroform to a concentration of 10 wt %. The samples were placed in a distillation apparatus, and the pressure was changed under vacuum conditions to remove excess chloroform.

[0078] Next, the sample was poured into a Teflon mold up to 1 / 3 of the way up, and made into a foam shape under vacuum conditions, and dried at 25°C for 18 hours.

[0079] In the case of Example 1, the foam shape was maintained even after 24 hours of drying (see FIG. 1(b)), but in the case of Comparative Example 4, it was confirmed that the foam shape could not be maintained after 1 hour of drying and changed into a film shape (see FIG. 1(a)).

Claims

1. It contains a plurality of repeating units derived from 3-hydroxypropionic acid represented by the following chemical formula 1: The polymer has a network structure formed by bonding an end group of any one of the repeating units to an end group of another repeating unit via a reactive monomer, The alpha value measured by a multi-angle light scattering detector (MALS) is 0.4 to 0.

8. Poly(3-hydroxypropionic acid) polymer: 【Chemistry 1】

2. The network structure includes at least two branched structures formed by bonding at least three repeating units. The poly(3-hydroxypropionic acid) polymer according to claim 1.

3. The reactive monomer may include a hydroxyl group (—OH), a carboxyl group (—COOH), an amino group (—NH ２ ), containing one or more terminal reactive substituents selected from the group consisting of a cyano group (—CN), a thiol group (—SH), and an isocyanate group (—N═C═O); The poly(3-hydroxypropionic acid) polymer according to claim 1.

4. The reactive monomer is polyC １－６０ Alkylene polyol or C １－６０ alkyl dicarboxylic acids, The poly(3-hydroxypropionic acid) polymer according to claim 1.

5. The polyC １－６０ Alkylene polyols include glycerol, 3-arm-poly(ethylene glycol), ｎ＝２～１５ , 4-arm-poly(ethylene glycol) ｎ＝２～１０ erythritol, pentaerythritol, di(trierythritol propane), xylitol, sorbitol, tripentaerythritol, inositol, and β-cyclodextrin; The poly(3-hydroxypropionic acid) polymer according to claim 4.

6. Said C １－６０ The alkyl dicarboxylic acid is at least one selected from the group consisting of malonic acid, succinic acid, adipic acid, 1,3,5-benzenetricarboxylic acid, 1,3,5-triazine-2,4,6-tricarboxylic acid, citric acid, and 2,2-bis(hydroxymethyl)butyric acid. The poly(3-hydroxypropionic acid) polymer according to claim 4.

7. The weight average molecular weight (Mw) of the poly(3-hydroxypropionic acid) polymer is 2,000 to 100,000. The poly(3-hydroxypropionic acid) polymer according to claim 1.

8. The number average molecular weight (Mn) of the poly(3-hydroxypropionic acid) polymer is 500 to 50,000. The poly(3-hydroxypropionic acid) polymer according to claim 1.

9. The polydispersity index (PDI) of the poly(3-hydroxypropionic acid) polymer is 3.0 to 20.

0. The poly(3-hydroxypropionic acid) polymer according to claim 1.

10. The melting temperature (Tm) of the poly(3-hydroxypropionic acid) polymer is 50 to 70°C, and the sum of enthalpies (ΔH) in this region is less than 50 J / g. The poly(3-hydroxypropionic acid) polymer according to claim 1.

11. A first step of polymerizing 3-hydroxypropionic acid and reactive monomers to form oligomers; and a second step of polymerizing the oligomer to produce a poly(3-hydroxypropionic acid) polymer having a network structure; A method for producing the poly(3-hydroxypropionic acid) polymer according to claim 1.

12. The reactive monomer may include a hydroxyl group (—OH), a carboxyl group (—COOH), an amino group (—NH ２ ), containing one or more terminal reactive substituents selected from the group consisting of a cyano group (—CN), a thiol group (—SH), and an isocyanate group (—N═C═O); The method for producing the poly(3-hydroxypropionic acid) polymer according to claim 11.

13. The reactive monomer is polyC １－６０ Alkylene polyol or C １－６０ alkyl dicarboxylic acids, The method for producing the poly(3-hydroxypropionic acid) polymer according to claim 11.

14. The polyC １－６０ The alkylene polyol is contained in an amount of 0.1 to 15 mol % based on 100 mol of 3-hydroxypropionic acid, Said C １－６０ The alkyl dicarboxylic acid is contained in an amount of 0.01 to 5 mol% based on 100 mol of 3-hydroxypropionic acid. The method for producing the poly(3-hydroxypropionic acid) polymer according to claim 13.

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