CN117164834A - PEF copolyester capable of being rapidly degraded in water and preparation method thereof - Google Patents
PEF copolyester capable of being rapidly degraded in water and preparation method thereof Download PDFInfo
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- CN117164834A CN117164834A CN202311086887.6A CN202311086887A CN117164834A CN 117164834 A CN117164834 A CN 117164834A CN 202311086887 A CN202311086887 A CN 202311086887A CN 117164834 A CN117164834 A CN 117164834A
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- pef
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- pyrrolidone
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- 229920001634 Copolyester Polymers 0.000 title claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 59
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 41
- CHTHALBTIRVDBM-UHFFFAOYSA-N furan-2,5-dicarboxylic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)O1 CHTHALBTIRVDBM-UHFFFAOYSA-N 0.000 claims abstract description 32
- FJRTVLWHONLTLA-UHFFFAOYSA-N methyl 5-oxopyrrolidine-3-carboxylate Chemical compound COC(=O)C1CNC(=O)C1 FJRTVLWHONLTLA-UHFFFAOYSA-N 0.000 claims abstract description 27
- 230000015556 catabolic process Effects 0.000 claims abstract description 23
- 238000006731 degradation reaction Methods 0.000 claims abstract description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 10
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000003054 catalyst Substances 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims abstract description 5
- 239000002904 solvent Substances 0.000 claims abstract 2
- 238000006068 polycondensation reaction Methods 0.000 claims description 10
- 238000005809 transesterification reaction Methods 0.000 claims description 7
- ZMKVBUOZONDYBW-UHFFFAOYSA-N 1,6-dioxecane-2,5-dione Chemical group O=C1CCC(=O)OCCCCO1 ZMKVBUOZONDYBW-UHFFFAOYSA-N 0.000 claims description 6
- DVVGBNZLQNDSPA-UHFFFAOYSA-N 3,6,11-trioxabicyclo[6.2.1]undeca-1(10),8-diene-2,7-dione Chemical group O=C1OCCOC(=O)C2=CC=C1O2 DVVGBNZLQNDSPA-UHFFFAOYSA-N 0.000 claims description 6
- 239000005977 Ethylene Substances 0.000 claims description 6
- -1 ethylene diester Chemical class 0.000 claims description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 238000009833 condensation Methods 0.000 claims 1
- 230000005494 condensation Effects 0.000 claims 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims 1
- 239000000178 monomer Substances 0.000 abstract description 10
- 150000005690 diesters Chemical class 0.000 abstract description 8
- 230000015572 biosynthetic process Effects 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 6
- 238000003786 synthesis reaction Methods 0.000 abstract description 6
- 230000009477 glass transition Effects 0.000 abstract description 4
- 238000012643 polycondensation polymerization Methods 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 239000002861 polymer material Substances 0.000 abstract description 2
- 238000009776 industrial production Methods 0.000 abstract 1
- 230000002194 synthesizing effect Effects 0.000 abstract 1
- 238000002844 melting Methods 0.000 description 8
- 230000008018 melting Effects 0.000 description 8
- 239000011521 glass Substances 0.000 description 6
- 229920000728 polyester Polymers 0.000 description 6
- 229920000180 alkyd Polymers 0.000 description 4
- 230000007062 hydrolysis Effects 0.000 description 4
- 238000006460 hydrolysis reaction Methods 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 238000000748 compression moulding Methods 0.000 description 3
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000012298 atmosphere Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229920001477 hydrophilic polymer Polymers 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 230000010512 thermal transition Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Abstract
The invention belongs to the field of high polymer material synthesis, and in particular relates to PEF copolyester capable of being rapidly degraded in water and a preparation method thereof, wherein the PEF copolyester is prepared from diester monomers containing three-membered rings. The invention takes N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester), ethylene glycol and 2, 5-furandicarboxylic acid as raw materials, tetrabutyl titanate as catalyst, and carries out condensation polymerization under the protection of nitrogen at high temperature and high vacuum degree and without solvent to obtain PEC x EF y A copolyester. The invention has the advantages that the diester monomer obtained by synthesizing from renewable resources is utilized, the sources of raw materials are wide, the reaction conditions are mild, the synthesis process is easy to operate, the prepared copolyester has adjustable performance, high glass transition temperature and good thermal stability, the possibility of industrial production is provided, the degradation speed of PEF in water can be improved, and the application of PEF in the field of degradation materials is expanded.
Description
Technical Field
The invention belongs to the field of high polymer materials, relates to the technical field of renewable resource utilization and green synthesis, and in particular relates to PEF copolyester capable of being rapidly hydrolyzed and a preparation method thereof.
Background
Poly (ethylene 2, 5-furandicarboxylate) (PEF) is a novel bio-based polyester, has the advantages of high rigidity, good thermal stability, good barrier property and the like, is one of the most potential environment-friendly materials capable of replacing the traditional high polymer, and is mainly applied to the fields of food packaging bags, beverage bottles, biomedical appliances and the like. However, it is difficult to degrade, especially if it is not degradable under natural conditions, so that PEF plastics can cause white pollution. In the prior art, various methods are conventionally used to improve the degradation performance of PEF in water. Firstly, developing a new degradable polyester material to replace PEF; secondly, copolymerizing the PEF with a third monomer, typically a petroleum-based compound; the method comprises the steps of carrying out a first treatment on the surface of the And thirdly, adopting hydrophilic polymer or hydrophilic auxiliary agent to blend with PEF. There are a number of problems: such as high cost, poor material properties, the raw materials still come from non-renewable petrochemical byproducts.
Therefore, how to further improve the degradation performance of the PEF material in water under natural conditions by utilizing the bio-based raw materials under the condition that the thermal performance and mechanical properties of the PEF polyester are not affected is a technical problem to be solved.
Disclosure of Invention
The invention aims to provide a method for preparing modified PEF copolyester by using a diester monomer containing a three-membered ring, and the preparation method has the advantages of simple synthesis process, easy operation, higher yield, environmental protection and easy industrialized popularization.
In order to achieve the above object, the technical scheme of the present invention is as follows:
in a first aspect, the present invention provides a PEF copolyester capable of rapid degradation rate in water, comprising N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester) ethylene diester repeat units represented by formula (a) and ethylene 2, 5-furandicarboxylate repeat units represented by formula (b),
the chemical name is: poly (ethylene 2, 5-furandicarboxylate-co-N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester) ethylene diester;
the number average molecular weight of the PEF copolyester is not less than 10000g/mol.
The degradation rate of the PEF copolyester capable of being rapidly degraded in water in 100 days is not lower than 15%.
Further, the sum of the N, N '-trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester) butylene succinate repeating units and the 2, 5-furandicarboxylic acid ethylene diester repeating units in the PEF copolyester capable of being rapidly degraded in water is 100 percent, wherein the N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester) butylene succinate repeating units account for 5 to 40 percent; the balance is the repeating units of ethylene 2, 5-furandicarboxylate.
Further, the N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester) butylene succinate repeating unit accounts for 10% -20%; the balance is the repeating units of ethylene 2, 5-furandicarboxylate.
In a second aspect, the present invention provides a process for preparing a rapidly water degradable PEF copolyester from a tricyclic diester-containing monomer, said copolymer being obtained by condensation polymerization of N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester), ethylene glycol and 2, 5-furandicarboxylic acid under solvent-free conditions.
Further, the preparation method of the PEF copolyester capable of being rapidly degraded in water comprises the following steps:
and (3) putting diester monomers N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester), ethylene glycol and 2, 5-furandicarboxylic acid into a closed reactor, adding a catalyst, and sequentially carrying out transesterification and polycondensation under the protection of nitrogen to obtain the PEF copolyester capable of being degraded in water rapidly.
Further, the molar ratio of acid to alcohol of the 2, 5-furandicarboxylic acid, the N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester) and the ethylene glycol is 1:1.8-3.0.
Further, the catalyst is tetrabutyl titanate, and the addition amount of the tetrabutyl titanate is 0.03-0.5 percent of the total feeding molar amount of N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester), ethylene glycol and 2, 5-furandicarboxylic acid.
Further, the temperature of the transesterification reaction is 180-230 ℃, and the transesterification reaction time is 5-10 h.
Further, the polycondensation reaction is carried out under the vacuum degree of less than or equal to 100Pa, the polycondensation reaction temperature is 230-260 ℃, and the polycondensation reaction time is 2-8 h.
In the technical scheme, the number average molecular weight of the PEF homo-polyester is not less than 10000g/mol, and the glass transition temperature is not less than 75 ℃.
The beneficial effects of the invention are as follows:
1) The PEF polyester is modified by using the renewable monomer, and the prepared polyester has good thermal stability and high molecular weight and can reduce the dependence on petroleum resources;
2) The copolyester synthesis method is environment-friendly, simple in synthesis process, easy to operate, high in synthesis yield and capable of realizing large-scale production;
3) The copolyester material provided by the invention has adjustable performance, the PEF copolyester can be quickly degraded by adding the diester monomer, the defect of slow PEF hydrolysis is overcome, and the hydrolysis rate can be adjusted by adjusting the contents of 2, 5-furandicarboxylic acid and N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester).
Drawings
FIG. 1 is a DSC melting curve of example 1;
FIG. 2 is a DSC melting curve of example 2;
FIG. 3 is a plot of residual mass after degradation versus time for example 1;
fig. 4 is a plot of residual mass after degradation versus time for example 2.
Detailed Description
The following examples are given for the purpose of illustration only and are not to be construed as limiting the scope of the invention, as many insubstantial adaptations and modifications of the invention are within the scope of the invention as would be apparent to one of ordinary skill in the art.
In the examples which follow, all starting materials are essentially obtained commercially or are prepared by methods conventional in the art, unless otherwise specified.
In the following examples, the thermal transition analysis was carried out using a Q2000 type differential scanning calorimeter from TA company at a temperature rising rate of 10 ℃/min under a nitrogen atmosphere, and the temperature was in the range of-70 to 280 ℃.
In the following examples, the sample was cut into 5X 1mm sheets by compression molding, the sheets were placed in a glass bottle containing 15mL of deionized water, and the glass bottle was placed in a shaker at room temperature for 100 days to examine its water degradation properties.
The PEF copolyester is abbreviated as PEC x EF y E, C, and F represent ethylene glycol, N, N '-trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester), and 2, 5-furandicarboxylic acid, respectively, x and y are the molar proportions of N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester) and 2, 5-furandicarboxylic acid in the copolyester being 100%;
example 1
PEC 20 EF 80 Preparation of copolyester:
1) Preparation of PEC from diester monomers N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester) and ethylene glycol, 2, 5-furandicarboxylic acid by condensation polymerization 20 EF 80 Copolyester, alkyd mole ratio 1.8:1, a step of;
2) Weighing 0.2mol of N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester), 0.8mol of 2, 5-furandicarboxylic acid and 1.7mol of ethylene glycol according to the molar ratio of the initially designed alkyd, placing the mixture into a round-bottomed flask with good air tightness, dropwise adding 0.006mol of tetrabutyl titanate catalyst, and setting the transesterification temperature to 220 ℃ for reaction for 8 hours under the atmosphere of nitrogen;
3) The vacuum degree is regulated to 60Pa, the temperature is increased to 250 ℃, and the copolyester is obtained by polycondensation for 5 hours.
Example 2
PEC 30 EF 70 Preparation of copolyester:
1) Preparation of PEC from diester monomers N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester) and ethylene glycol, 2, 5-furandicarboxylic acid by condensation polymerization 20 EF 80 Copolyester, alkyd mole ratio 1.8:1, a step of;
2) Weighing 0.3mol of N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester), 0.7mol of 2, 5-furandicarboxylic acid and 1.7mol of ethylene glycol according to the molar ratio of the initially designed alkyd, placing the mixture into a round-bottomed flask with good air tightness, dropwise adding 0.006mol of tetrabutyl titanate catalyst, and setting the transesterification temperature to 220 ℃ for reaction for 8 hours under the atmosphere of nitrogen;
3) The vacuum degree is regulated to 60Pa, the temperature is increased to 250 ℃, and the copolyester is obtained by 4 hours of polycondensation reaction.
Test example 1
PEC 20 EF 80 Copolyester DSC test:
1) Weighing 5-10mg of the copolyester prepared in the example 1, and placing the copolyester in a differential scanning calorimeter to test a melting curve;
2) Setting a program of heating-isothermal-cooling-isothermal-heating, wherein the temperature test range is-70-280 ℃, and the temperature rise rates are all 10 ℃/min, so as to obtain a melting curve graph.
FIG. 1 is a PEC 20 EF 80 The DSC melting curve of the copolyester, from which the glass transition temperature (T g ) At 80.1℃and PEF T g Is 75.2 ℃. PEC 20 EF 80 T of the copolyester g Higher than PEF.
Test example 2
PEC 30 EF 70 Copolyester DSC test:
1) Weighing 5-10mg of the copolyester prepared in the example 2, and placing the copolyester in a differential scanning calorimeter to test a melting curve;
2) Setting a program of heating-isothermal-cooling-isothermal-heating, wherein the temperature test range is-70-280 ℃, and the temperature rise rates are all 10 ℃/min, so as to obtain a melting curve graph.
FIG. 2 is a PEC 30 EF 70 The DSC melting curve of the copolyester, from which the glass transition temperature (T g ) 83.3 ℃, PEF T g Is 75.2 ℃. PEC 30 EF 70 T of the copolyester g Higher than PEF.
Test example 3
PEC 20 EF 80 Copolyester water degradation performance test:
1) PEC sample 20 EF 80 Cutting the copolyester into sheets with the thickness of 5 multiplied by 1mm through compression molding, and placing the sheets into a glass bottle filled with 15mL of deionized water for water degradation test;
2) The glass bottle was placed in a shaker at room temperature and shaken for 100 days, the sheet was taken out at intervals to be dried, and the mass was weighed and the mass reduction ratio was recorded.
FIG. 3 is a PEC 20 EF 80 The residual mass after degradation of the copolyester is plotted against time, and it is clear from the graph that PEF is relatively stable without quality degradation by 100 days of water degradation, while PEC 20 EF 80 The quality of the copolyester is reduced along with degradation, and after 100 days, the quality is reduced by 7%, and the quick hydrolysis characteristic is shown.
Test example 4
PEC 30 EF 70 Copolyester water degradation performance test:
1) PEC sample 30 EF 70 Cutting the copolyester into sheets with the thickness of 5 multiplied by 1mm through compression molding, and placing the sheets into a glass bottle filled with 15mL of deionized water for water degradation test;
2) The glass bottle was placed in a shaker at room temperature and shaken for 100 days, the sheet was taken out at intervals to be dried, and the mass was weighed and the mass reduction ratio was recorded.
FIG. 4 is a PEC 30 EF 70 The residual mass after the degradation of the copolyester is changed along with time, and the PEF is relatively stable without obvious mass reduction after 100 days of water degradation, while the PEC 30 EF 70 The quality of the copolyester is rapidly reduced along with degradation, 1After 00 days, the quality is reduced by 17%, and the rapid water degradation characteristic is shown. With increasing N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester) content, the hydrolysis rate increases.
Claims (9)
1. A PEF copolyester capable of being rapidly degraded in water is characterized by comprising an N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester) ethylene diester repeating unit shown in a formula (a) and a 2, 5-furandicarboxylic acid ethylene diester repeating unit shown in a formula (b),
the chemical name is: poly (ethylene 2, 5-furandicarboxylate-co-N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester) ethylene diester;
the number average molecular weight of the PEF copolyester is not less than 10000g/mol;
the degradation rate of the PEF copolyester capable of being rapidly degraded in water in 100 days is not lower than 15%.
2. The rapidly water degradable PEF copolyester of claim 1, wherein the N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester) butylene succinate repeating unit in the rapidly water degradable PEF copolyester is 5% -40% in terms of a mole fraction of 100%; the balance is the repeating units of ethylene 2, 5-furandicarboxylate.
3. The rapidly water degradable PEF copolyester of claim 1, wherein the N, N '-trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester) butylene succinate repeating unit is present in an amount of 10% to 20% based on 100% of the total number of moles of N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester) butylene succinate repeating units in the PEF copolyester having an adjustable degradation rate in water; the balance is the repeating units of ethylene 2, 5-furandicarboxylate.
4. A process for the preparation of a rapidly water degradable PEF copolyester according to any one of claims 1 to 3, characterised in that said PEF copolymer is obtained by condensation polymerisation of N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester), ethylene glycol and 2, 5-furandicarboxylic acid in the absence of a solvent.
5. The method of manufacturing according to claim 4, comprising the steps of:
and (3) putting N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester), ethylene glycol and 2, 5-furandicarboxylic acid into a closed reactor, adding a catalyst, and sequentially carrying out transesterification and polycondensation under the protection of nitrogen to obtain the PEF copolyester capable of being degraded in water rapidly.
6. The preparation method according to claim 5, wherein the molar ratio of the sum of the 2, 5-furandicarboxylic acid, the N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester) and the glycol is 1:1.8-3.0.
7. The preparation method according to claim 5, wherein the catalyst is tetrabutyl titanate, and the addition amount of the tetrabutyl titanate is 0.03-0.5% of the total addition molar amount of N, N' -trans-1, 4-cyclohexane-bis (pyrrolidone-4-carboxylic acid methyl ester), ethylene glycol and 2, 5-furandicarboxylic acid.
8. The method according to claim 5, wherein the transesterification reaction is carried out at a temperature of 180 to 230℃for a period of 5 to 10 hours.
9. The process according to claim 5, wherein the polycondensation is carried out under a vacuum of 100Pa or less, the polycondensation temperature is 230 to 260℃and the polycondensation time is 2 to 8 hours.
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