WO2020259723A1 - Pva基复合材料及其前驱体、重塑产品、复合水凝胶、复合薄膜及制备和应用 - Google Patents
Pva基复合材料及其前驱体、重塑产品、复合水凝胶、复合薄膜及制备和应用 Download PDFInfo
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- WO2020259723A1 WO2020259723A1 PCT/CN2020/111998 CN2020111998W WO2020259723A1 WO 2020259723 A1 WO2020259723 A1 WO 2020259723A1 CN 2020111998 W CN2020111998 W CN 2020111998W WO 2020259723 A1 WO2020259723 A1 WO 2020259723A1
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- pva
- based composite
- composite material
- polyvinyl alcohol
- tannic acid
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- 239000002131 composite material Substances 0.000 title claims abstract description 284
- 239000000017 hydrogel Substances 0.000 title claims abstract description 76
- 239000002243 precursor Substances 0.000 title claims abstract description 58
- 238000002360 preparation method Methods 0.000 title claims abstract description 39
- 239000010409 thin film Substances 0.000 title abstract 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 435
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 431
- 239000001263 FEMA 3042 Substances 0.000 claims abstract description 199
- 229920002258 tannic acid Polymers 0.000 claims abstract description 199
- 229940033123 tannic acid Drugs 0.000 claims abstract description 199
- TUSDEZXZIZRFGC-UHFFFAOYSA-N 1-O-galloyl-3,6-(R)-HHDP-beta-D-glucose Natural products OC1C(O2)COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC1C(O)C2OC(=O)C1=CC(O)=C(O)C(O)=C1 TUSDEZXZIZRFGC-UHFFFAOYSA-N 0.000 claims abstract description 198
- LRBQNJMCXXYXIU-PPKXGCFTSA-N Penta-digallate-beta-D-glucose Natural products OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-PPKXGCFTSA-N 0.000 claims abstract description 198
- LRBQNJMCXXYXIU-NRMVVENXSA-N tannic acid Chemical compound OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-NRMVVENXSA-N 0.000 claims abstract description 198
- 235000015523 tannic acid Nutrition 0.000 claims abstract description 198
- 239000007864 aqueous solution Substances 0.000 claims abstract description 39
- 239000000047 product Substances 0.000 claims abstract description 17
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- 238000004566 IR spectroscopy Methods 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 229910052739 hydrogen Inorganic materials 0.000 claims description 17
- 239000001257 hydrogen Substances 0.000 claims description 17
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical group Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 16
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
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- PVNIIMVLHYAWGP-UHFFFAOYSA-N Niacin Chemical compound OC(=O)C1=CC=CN=C1 PVNIIMVLHYAWGP-UHFFFAOYSA-N 0.000 description 2
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- IAZDPXIOMUYVGZ-WFGJKAKNSA-N Dimethyl sulfoxide Chemical compound [2H]C([2H])([2H])S(=O)C([2H])([2H])[2H] IAZDPXIOMUYVGZ-WFGJKAKNSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 238000001157 Fourier transform infrared spectrum Methods 0.000 description 1
- -1 Poly(vinyl alcohol) Polymers 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
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- 230000005311 nuclear magnetism Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G83/00—Macromolecular compounds not provided for in groups C08G2/00 - C08G81/00
- C08G83/008—Supramolecular polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
- C08J3/075—Macromolecular gels
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L87/00—Compositions of unspecified macromolecular compounds, obtained otherwise than by polymerisation reactions only involving unsaturated carbon-to-carbon bonds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2387/00—Characterised by the use of unspecified macromolecular compounds, obtained otherwise than by polymerisation reactions only involving unsaturated carbon-to-carbon bonds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
Definitions
- Ya-Nan Chen et al. also disclosed a method for PVA-TA blending to prepare shape memory hydrogels (Ya-Nan Chen, Poly(vinyl alcohol)-Tannic Acid Hydrogels with Excellent Mechanical Properties and Shape Memory Behaviors, ACS Applied Materials & Interfaces, 2016, 8, p27199-27206), although the author pointed out that the XRD results in Figure 2(b) show that PVA-TA hydrogel does not have the three characteristic diffraction peaks of PVA, and is an amorphous structure.
- the XRD patterns of the two PVA-TA hydrogel products in Fig. 2(b) of the document both show a characteristic peak at 20° after being enlarged, and the intensity is not weak.
- the XRD patterns of the two PVA-TA hydrogel products in Figure 2(b) of Ya-Nan Chen et al.'s literature are in full agreement with the characteristic peaks at 20° after magnification; more importantly, Ya-Nan Chen et al.
- the reported spectra of the two PVA-TA hydrogels in Figure 2(b) are compared with the XRD spectra of PVA hydrogels obtained by repeated experiments or with the XRD spectra of PVA hydrogels reported in the literature.
- the peak intensity, peak shape and peak position can basically be completely consistent, indicating that the PVA-TA hydrogel reported by Ya-Nan Chen et al. can only be identified as a crystal structure consistent with PVA hydrogel. That is, according to the literature published by Ya-Nan Chen and others, it is impossible to prove that the obtained hydrogel has an amorphous structure.
- the technical problem to be solved by the present invention is to overcome the defect that the PVA-TA hydrogel in the prior art still retains the crystal structure of the PVA hydrogel, so that the mechanical properties such as toughness cannot meet the requirements, and provide a PVA-based hydrogel.
- the composite material precursor, composite material, composite hydrogel, and composite film provided by the present invention have the advantages of increased strength, greatly improved toughness, etc., and also have water processability, ultraviolet light absorption, freshness retention, easy degradation and Can be reshaped.
- the preparation method of the PVA-based composite material precursor preferably includes the following steps: mixing the aqueous polyvinyl alcohol solution and the aqueous tannic acid solution uniformly, adjusting the pH to below 6.35, precipitating, and separating and collecting the precipitate. .
- the thickness of the PVA-based composite material sheet conventionally used in the field can be prepared, for example, less than 1.75 mm, preferably 0.075 to 1.75 mm.
- the quality of tannic acid and polyvinyl alcohol in the PVA-based composite film is preferably (0.74:1) to (1:0.65), and more preferably (0.86:1.0) to (1.0: 0.65); and/or, the ratio of tannic acid molecules to polyvinyl alcohol monomers in the PVA-based composite film is (1:52) to (1:25), preferably (1:45) ⁇ (1:25).
- the number ratio of tannic acid molecules to polyvinyl alcohol monomers refers to the molar ratio of tannic acid molecules to the repeating structural units of polyvinyl alcohol in the PVA-based composite film.
- the mass ratio refers to the mass ratio of tannic acid molecules and polyvinyl alcohol molecules in the PVA-based composite film, where tannic acid molecules and polyvinyl alcohol molecules are combined by hydrogen bonds to form supramolecular aggregates.
- the reaction yield refers to the percentage of the dried mass of the precipitate obtained by the reaction to the total mass of tannic acid and polyvinyl alcohol in the raw material.
- the PVA sheet with a thickness of 75 and the TA 0.50- PVA 1.0 composite material of different thicknesses (75 ⁇ m, 150 ⁇ m, 350 ⁇ m, 750 ⁇ m, 1000 m) prepared in Example 1 were subjected to ultraviolet-visible light transmission tests.
- Figure 4 shows that the TA 0.50- PVA 1.0 sample (length*width*thickness: 220*20*0.15mm) with a mass of 0.85 g can lift a 25 kg bucket.
- the four diffraction curves correspond to PVA, TA 0.50 -PVA 1.0 , TA 1.0 -PVA 1.0 and TA 1.0 -PVA 0.50 samples from top to bottom.
- Figure 5 is XRD. It can be seen that the addition of tannic acid inhibits the crystallization of PVA. This conclusion can also be obtained from the infrared spectrum of Figure 6, which is supported by the literature. The peak at the wavelength of 1142cm -1 and PVA There is a linear relationship between the crystallinity, and it can be seen that after adding tannic acid, the peak at the wavelength of 1142 cm -1 disappears.
- the display sample is TA 0.50 -PVA 1.0 (original sample, length * width * thickness is 120*80*0.1mm).
- the specific operation steps are as follows: fold the sample into an airplane, then unfold the folded sample, and then repair the crease sample under 90% humidity for 10 hours.
- the specific operation of the repair method after folding is as follows: natural reduction in an environment with a humidity of 90%, the conclusion is that the material can be recovered without leaving creases, indicating that the sample is very tough and the creases can disappear under high humidity.
- Degradation process bury 3*3*0.075 cm of PVA and the compound in the soil with a depth of 8 cm, take it out for a fixed time, wash, dry and weigh.
- step 3 of Example 1 The precipitate obtained in step 3 of Example 1 was collected and placed in a lantern-shaped mold, dried and molded to obtain a lantern-shaped bulk material, as shown in FIG. 9. It is explained that the composite material of the present application can be formed into any shape or structure through mold processing.
- the tensile curve of the hydrogel of the TA 0.50 -PVA 1.0 composite in Example 2 is shown in FIG. 10.
- the results show that the composite hydrogel has a high breaking elongation, which can be stretched by nearly 1200%, which also provides a basis for the subsequent preparation of composite films.
- the film made of TA 0.50 -PVA 1.0 composite was moistened with deionized water at the edges and pressed together to prepare an open bag, then the oranges were put into the bag, and finally the mouth of the bag was moistened with deionized water and pressed on At the same time, the mouth is sealed and placed indoors (temperature is 19°C, humidity is 20%) to observe the condition of oranges.
- the results show that oranges deteriorate quickly in the natural state; while the oranges deteriorate in the state covered with composite film The speed has slowed down significantly.
- the results show that the composite film has a good preservation function.
- the 4 samples in the figure are samples obtained by reshaping the same composite material 1, 2, 3, and 4 times according to the method of Example 4.
- the results show that the mechanical properties of the reshaped samples are reshaped and the mechanical properties are reshaped four times. None has been reduced.
- NMR spectra of PVA, TA and PVA/TA complex are shown in Figure 14.
- the number of monomers obtained from the NMR spectra is shown in Table 4.
- the monomer quantity ratio (detected value, TA:PVA) refers to the molar ratio of TA molecules in the composite material to the repeating structural unit of PVA (ie -C 2 H 4 O-). This data is to dissolve the composite material In deuterated dimethyl sulfoxide, it is obtained by measuring nuclear magnetism.
- the mass ratio refers to the mass ratio of TA and PVA in the composite material, which is calculated by combining molecular weight and monomer quantity ratio.
- Example 6 Preparation of a composite material with a mass ratio of tannic acid and polyvinyl alcohol of 0.016:1
- Example 2 This example is obtained on the basis of Example 1. Only the mass ratio of TA:PVA is replaced with 0.016:1. In addition, the pH adjustment agent is not used in this example to adjust the pH. It is measured in the mixed system of TA and PVA The pH value is 5.26, and the other process conditions remain unchanged. The infrared spectrum of the obtained composite material is shown in FIG. 15.
- the crystallinity is calculated by reference (O.N. Tretinnikov, Determination of the degree of crystallinity of poly (vinyl alcohol) by FTIR spectroscopy, Journal of Applied Spectroscopy, 2012, 4, 79, p525).
- crystallinity data is based on the formula (1) on page 525 of the document:
- XRD patterns and DSC detection results of the composite material obtained in this example are shown in Figs. 16 and 17.
- the XRD pattern shows that the composite material of this example also has a crystalline peak of PVA near 20°.
- DSC test results show that there is a crystalline peak in the cooling curve, but the overall peak shape is not sharp, far inferior to the PVA cooling curve. The obvious cooling crystallization peak.
- the composite material prepared in this example is in a mixed state of crystalline and amorphous states.
- Example 2 This example is obtained on the basis of Example 1, only modified to "Add a drop of 10 mg/mL PVA solution to the 10 mg/mL TA aqueous solution (at this time, the feed ratio of tannic acid and polyvinyl alcohol can be considered It is 10000:1)", and the other process conditions are unchanged.
- the results show that precipitation will also occur and further composite materials will be made.
- XRD, infrared, small-angle X-ray scattering, and DSC were performed on the obtained composite material, and the same experimental conclusions as in Figs. 5-8 were obtained, indicating that the obtained composite material was still amorphous.
- This comparative example is obtained on the basis of the test of TA 0.50- PVA 1.0 in Example 1. Only the equivalent amount of tannic acid is replaced with polyacrylic acid (PAA), and the other raw materials and process conditions are unchanged.
- PAA polyacrylic acid
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Abstract
Description
压制时间(min) | 复合材料的厚度(mm) |
0.017 | 1.75 |
0.05 | 1.32 |
0.133 | 0.8 |
2 | 0.52 |
5 | 0.45 |
10 | 0.25 |
17 | 0.2 |
22 | 0.15 |
30 | 0.075 |
降解率 | 10天 | 25天 | 35天 | 45天 |
PVA | 8.4% | 16.2% | 22.9% | 29.1% |
TA 0.50-PVA 1.0 | 26.9% | 32.8% | 41.4% | 57.5% |
TA 1.0-PVA 0.50 | 53.6% | 62.5% | 68.2% | 86.2% |
Claims (25)
- 一种PVA基复合材料前驱体的制备方法,其特征在于,其包括如下步骤:将聚乙烯醇水溶液与单宁酸水溶液混合均匀后的溶液沉淀,分离收集沉淀物,即可;其中,单宁酸与聚乙烯醇的质量比为0.016:1以上。
- 如权利要求1所述的PVA基复合材料前驱体的制备方法,其特征在于,所述制备方法包括如下步骤:将聚乙烯醇水溶液与单宁酸水溶液混合均匀,调pH至6.35以下,沉淀,分离收集沉淀物,即可;其中,调pH所用的pH调节剂较佳地为盐酸溶液,所述盐酸溶液的浓度较佳地为0.5~3mol/L;其中,较佳地,将pH调整至2.0~5.26;和/或,所述的混合均匀的方式包括如下步骤:将所述聚乙烯醇水溶液加入所述单宁酸水溶液中;所述的加入的操作较佳地为滴加;和/或,所述单宁酸与聚乙烯醇的质量比为(0.25:1)~(1:0.5),较佳地为0.5:1;或,所述单宁酸与聚乙烯醇的质量比为(0.5:1)~(1:0.75),较佳地为(0.75:1)~(1:1);和/或,所述的聚乙烯醇水溶液由聚乙烯醇粉末与去离子水混合均匀后,加热溶解得到;和/或,所述的聚乙烯醇水溶液中聚乙烯醇的浓度为125mg/mL以下,较佳地为10~125mg/mL;和/或,所述的单宁酸水溶液中单宁酸的浓度为250mg/mL以下,较佳地为10~250mg/mL;和/或,所述的分离收集沉淀物的操作为离心处理,所述离心处理较佳地为在离心机中以8000~10000rpm的转速离心8~15分钟,更佳地为在离心机中以9500rpm的转速离心10分钟。
- 一种由如权利要求1或2所述的PVA基复合材料前驱体的制备方法制得的PVA基复合材料前驱体。
- 如权利要求3所述的PVA基复合材料前驱体,其特征在于,所述的PVA基复合材料前驱体为无定形态,或者为无定形与晶型的混合态,红外光谱检测的结晶度为34%以下;和/或,所述的PVA基复合材料前驱体中单宁酸与聚乙烯醇的质量比为(0.74:1)~(1:0.65),较佳地为(0.86:1.0)~(1.0:0.65);和/或,所述的PVA基复合材料前驱体中单宁酸分子与聚乙烯醇的单体数量比为(1: 52)~(1:25),较佳地为(1:45)~(1:25)。
- 一种PVA基复合材料前驱体,其特征在于,所述的PVA基复合材料前驱体为单宁酸分子与聚乙烯醇分子以氢键结合形成的超分子聚集体;所述PVA基复合材料前驱体为无定形态;或者为无定形与晶型的混合态,红外光谱检测的结晶度为34%以下。
- 如权利要求5所述的PVA基复合材料前驱体,其特征在于,所述的PVA基复合材料前驱体中单宁酸与聚乙烯醇的质量比为(0.74:1)~(1:0.65),较佳地为(0.86:1.0)~(1.0:0.65);和/或,所述的PVA基复合材料前驱体中单宁酸分子与聚乙烯醇的单体数量比为(1:52)~(1:25),较佳地为(1:45)~(1:25)。
- 一种PVA基复合材料的制备方法,其特征在于,其包括如下步骤:将如权利要求3~6中任意一项所述的PVA基复合材料前驱体成型,干燥即可。
- 如权利要求7所述的PVA基复合材料的制备方法,其特征在于,当所述PVA基复合材料为片材时,其制备方法包括如下步骤:将所述PVA基复合材料前驱体压制成片材,再干燥即可;所述压制较佳地为将所述的PVA基复合材料前驱体放在两层聚酰亚胺膜中,在室温下压制成型;所述压制较佳地在固定压机中实现,所述固定压机的压力较佳地为1~5MPa,更佳地为4MPa;所述压制的时间较佳地为0.017~30分钟。
- 一种由如权利要求7或8所述的制备方法制得的PVA基复合材料。
- 如权利要求9所述的PVA基复合材料,其特征在于,所述PVA基复合材料为无定形态,或者为无定形与晶型的混合态,红外光谱检测的结晶度为34%以下;和/或,所述的PVA基复合材料中所述单宁酸与聚乙烯醇的质量比为(0.74:1)~(1:0.65),较佳地为(0.86:1.0)~(1.0:0.65);和/或,所述的PVA基复合材料中单宁酸分子与聚乙烯醇的单体数量比为(1:52)~(1:25),较佳地为(1:45)~(1:25);和/或,所述的PVA基复合材料的厚度为30μm~1.75mm。
- 一种PVA基复合材料,其特征在于,所述PVA基复合材料为单宁酸分子与聚乙烯醇分子以氢键结合形成的超分子聚集体;所述PVA基复合材料为无定形态;或者为无定形与晶型的混合态,红外光谱检测的结晶度为34%以下。
- 如权利要求11所述的PVA基复合材料,其特征在于,所述的PVA基复合材料中单宁酸与聚乙烯醇的质量比为(0.74:1)~(1:0.65),较佳地为(0.86:1.0)~(1.0:0.65);和/或,所述的PVA基复合材料中单宁酸分子与聚乙烯醇的单体数量比为(1:52)~(1:25),较佳地为(1:45)~(1:25)。
- 一种如权利要求9~12任意一项所述的PVA基复合材料的重塑方法,其特征在于,其包括如下步骤:取所述PVA基复合材料,溶胀,成型,干燥即可;所述的溶胀使用的溶剂较佳地为pH不超过9.0的水溶液,更佳地为去离子水或酸性水溶液,进一步更佳地为pH=1.0~2.5的酸性水溶液,尤其更佳地为pH=2.0的酸性水溶液。
- 一种由如权利要求13所述的重塑方法制得的重塑产品,所述的重塑产品较佳地为无定形态,或者为无定形与晶型的混合态,红外光谱检测的结晶度为34%以下。
- 一种PVA基复合水凝胶的制备方法,其特征在于,其包括如下步骤:将如权利要求9~12任意一项所述的PVA基复合材料浸泡在pH不超过9.0的水溶液中,达到吸水饱和,即可;所述PVA基复合水凝胶的制备原料较佳地为厚度为150μm~1000μm的PVA基复合材料;所述pH不超过9.0的水溶液较佳地为酸性水溶液、中性或pH不超过9.0的弱碱性的水溶液,更佳地为去离子水。
- 一种由如权利要求15所述的制备方法制得的PVA基复合水凝胶。
- 如权利要求16所述的PVA基复合水凝胶,其特征在于,所述PVA基复合水凝胶为无定形态,或者为无定形与晶型的混合态,红外光谱检测的结晶度为34%以下;和/或,所述的PVA基复合水凝胶中所述单宁酸与聚乙烯醇的质量比为(0.74:1)~(1:0.65),较佳地为(0.86:1.0)~(1.0:0.65);和/或,所述的PVA基复合水凝胶中单宁酸分子与聚乙烯醇的单体数量比为(1:52)~(1:25),较佳地为(1:45)~(1:25)。
- 一种PVA基复合水凝胶,其特征在于,所述PVA基复合水凝胶为单宁酸分子与聚乙烯醇分子以氢键结合形成的超分子聚集体;所述PVA基复合水凝胶为无定形态;或者为无定形与晶型的混合态,红外光谱检测的结晶度为34%以下。
- 如权利要求18所述的PVA基复合水凝胶,其特征在于,所述的PVA基复合水凝胶中所述单宁酸与聚乙烯醇的质量比为(0.74:1)~(1:0.65),较佳地为(0.86:1.0)~(1.0:0.65);和/或,所述的PVA基复合水凝胶中单宁酸分子与聚乙烯醇的单体数量比为(1:52)~(1:25),较佳地为(1:45)~(1:25)。
- 一种PVA基复合薄膜的制备方法,其特征在于,其包括如下步骤:将如权利要 求16~19任意一项所述的PVA基复合水凝胶拉伸,再干燥即可;所述的拉伸较佳地为双轴拉伸或单轴拉伸。
- 一种由如权利要求20所述的制备方法制得的PVA基复合薄膜。
- 如权利要求21所述的PVA基复合薄膜,其特征在于,所述PVA基复合薄膜为无定形态,或者为无定形与晶型的混合态,红外光谱检测的结晶度为34%以下;和/或,所述的PVA基复合薄膜中单宁酸与聚乙烯醇的质量比为(0.74:1)~(1:0.65),较佳地为(0.86:1.0)~(1.0:0.65);和/或,所述的PVA基复合薄膜中单宁酸分子与聚乙烯醇的单体数量比为(1:52)~(1:25),较佳地为(1:45)~(1:25);和/或,所述PVA基复合薄膜的厚度为5~30μm,较佳地为25~30μm。
- 一种PVA基复合薄膜,其特征在于,所述PVA基复合薄膜为单宁酸分子与聚乙烯醇分子以氢键结合形成的超分子聚集体;所述PVA基复合薄膜为无定形态;或者为无定形与晶型的混合态,红外光谱检测的结晶度为34%以下。
- 如权利要求23所述的PVA基复合薄膜,其特征在于,所述的PVA基复合薄膜中单宁酸与聚乙烯醇的质量比为(0.74:1)~(1:0.65),较佳地为(0.86:1.0)~(1.0:0.65);和/或,所述的PVA基复合薄膜中单宁酸分子与聚乙烯醇的单体数量比为(1:52)~(1:25),较佳地为(1:45)~(1:25);和/或,所述PVA基复合薄膜的厚度为5~30μm,较佳地为25~30μm。
- 一种如权利要求21~24任一项所述的PVA基复合薄膜作为食品包装袋或保鲜袋的用途。
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