CN117209933A - Polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film and preparation method and application thereof - Google Patents
Polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film and preparation method and application thereof Download PDFInfo
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- CN117209933A CN117209933A CN202311215303.0A CN202311215303A CN117209933A CN 117209933 A CN117209933 A CN 117209933A CN 202311215303 A CN202311215303 A CN 202311215303A CN 117209933 A CN117209933 A CN 117209933A
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- polyvinyl alcohol
- starch
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- 239000004372 Polyvinyl alcohol Substances 0.000 title claims abstract description 68
- 239000001913 cellulose Substances 0.000 title claims abstract description 68
- 229920002678 cellulose Polymers 0.000 title claims abstract description 68
- 229920002451 polyvinyl alcohol Polymers 0.000 title claims abstract description 68
- 229920002472 Starch Polymers 0.000 title claims abstract description 57
- 239000008107 starch Substances 0.000 title claims abstract description 57
- 235000019698 starch Nutrition 0.000 title claims abstract description 57
- 239000002131 composite material Substances 0.000 title claims abstract description 53
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229920001592 potato starch Polymers 0.000 claims abstract description 15
- 235000013305 food Nutrition 0.000 claims abstract description 13
- 238000004806 packaging method and process Methods 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 230000007613 environmental effect Effects 0.000 claims abstract description 6
- 238000012544 monitoring process Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 26
- QMKYBPDZANOJGF-UHFFFAOYSA-N benzene-1,3,5-tricarboxylic acid Chemical compound OC(=O)C1=CC(C(O)=O)=CC(C(O)=O)=C1 QMKYBPDZANOJGF-UHFFFAOYSA-N 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 19
- 239000008367 deionised water Substances 0.000 claims description 18
- 229910021641 deionized water Inorganic materials 0.000 claims description 18
- 239000006185 dispersion Substances 0.000 claims description 16
- OPQARKPSCNTWTJ-UHFFFAOYSA-L copper(ii) acetate Chemical compound [Cu+2].CC([O-])=O.CC([O-])=O OPQARKPSCNTWTJ-UHFFFAOYSA-L 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 9
- ZOIORXHNWRGPMV-UHFFFAOYSA-N acetic acid;zinc Chemical compound [Zn].CC(O)=O.CC(O)=O ZOIORXHNWRGPMV-UHFFFAOYSA-N 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 6
- 239000004246 zinc acetate Substances 0.000 claims description 6
- YZYKBQUWMPUVEN-UHFFFAOYSA-N zafuleptine Chemical compound OC(=O)CCCCCC(C(C)C)NCC1=CC=C(F)C=C1 YZYKBQUWMPUVEN-UHFFFAOYSA-N 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 239000002520 smart material Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 30
- 229910021529 ammonia Inorganic materials 0.000 abstract description 18
- 239000002159 nanocrystal Substances 0.000 abstract description 11
- 230000004044 response Effects 0.000 abstract description 11
- 230000008859 change Effects 0.000 abstract description 10
- 241000143060 Americamysis bahia Species 0.000 abstract description 4
- 235000013372 meat Nutrition 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 238000003860 storage Methods 0.000 abstract description 4
- 238000002845 discoloration Methods 0.000 abstract description 3
- 229920000642 polymer Polymers 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 10
- 239000002245 particle Substances 0.000 description 5
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 239000000523 sample Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000012271 agricultural production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003115 biocidal effect Effects 0.000 description 1
- 229920002988 biodegradable polymer Polymers 0.000 description 1
- 239000004621 biodegradable polymer Substances 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000005003 food packaging material Substances 0.000 description 1
- 239000012767 functional filler Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229920005615 natural polymer Polymers 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000009466 transformation 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
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
The invention belongs to the technical field of polymer composite materials, and in particular relates to a polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film, a preparation method and application thereof, wherein the composite film is prepared from the following raw materials: potato starch, polyvinyl alcohol and functionalized modified cellulose nanocrystals. The invention also provides a preparation method of the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film material, the prepared composite film material has excellent compatibility, mechanical strength, toughness, ultraviolet obstruction, high-energy blue light obstruction, water vapor obstruction, ammonia response discoloration, biodegradability and other performances, can maintain higher visible light transparency, can be used as an intelligent indication material for effectively indicating the freshness change condition of meat foods such as shrimps in the storage process in time, has simple preparation process, and has wide application value in the fields of food packaging, intelligent materials, ammonia detection, environmental monitoring, safety and the like.
Description
Technical Field
The invention belongs to the technical field of polymer composite materials, and particularly relates to a polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film, and a preparation method and application thereof.
Background
Potato starch has wide sources, low price, good reproducibility and biocompatibility and excellent film forming performance, and is always regarded as a natural polymer for developing biodegradable films with the most development potential. Has wide application prospect in the fields of food packaging, biomedical treatment, intelligent gel and the like. However, as a food packaging material, the mechanical property, water resistance and moisture resistance of the starch film are not ideal, and the starch film lacks functionality and cannot meet the requirements of current food packaging. One way to overcome the disadvantages of pure starch materials is to mix it with other biodegradable polymers. The polyvinyl alcohol has the characteristics of rich sources, low price, high biocompatibility, high degradation speed and complete degradability, and has potential application value in various fields such as food packaging, agricultural production, papermaking, electronic devices and the like. The polyvinyl alcohol is added into the potato starch, so that the biodegradation speed of the material can be improved, and the more economical and environment-friendly polyvinyl alcohol/starch composite material can be produced. However, the polyvinyl alcohol/starch composite material has limited compatibility and poor mechanical and water vapor barrier properties, and meanwhile lacks the functions of ammonia response, ultraviolet barrier, antibiosis and the like, so that the polyvinyl alcohol/starch composite material is limited in practical application. According to the invention, polyvinyl alcohol/starch is used as a matrix, and functionalized modified cellulose nanocrystals are used as functional fillers, so that the performances of compatibility, mechanical strength, tensile elongation at break, toughness, ultraviolet obstruction, high-energy blue light obstruction, water vapor obstruction, ammonia response color change and the like of the composite material are improved, and a polyvinyl alcohol/starch/functionalized cellulose nanocrystal composite film is developed, and the application of the composite film in the fields of intelligent materials, food packaging, ammonia detection, environmental monitoring, safety and the like is widened.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film, and a preparation method and application thereof. The composite material has excellent compatibility, mechanical strength, elongation at break, toughness, ultraviolet obstruction, high-energy blue light obstruction, water vapor obstruction, ammonia response discoloration and other performances, can maintain higher visible light transparency, can be used as an intelligent indicating material for timely and effectively indicating the change condition of freshness of meat foods (such as shrimps) in the storage process, and is simple in preparation process, environment-friendly, low in cost and suitable for amplified production.
The technical scheme of the invention is as follows:
the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film is characterized by comprising the following components in parts by weight: 40 parts of potato starch, 160 parts of polyvinyl alcohol and 2-10 parts of functionalized modified cellulose nanocrystalline;
the preparation method of the functionalized modified cellulose nanocrystalline comprises the following steps:
(1) Dispersing 30 parts of cellulose nanocrystalline in 5000 parts of deionized water, and stirring for 30min at room temperature to obtain uniform cellulose nanocrystalline dispersion for later use;
(2) Dissolving 10 parts of copper acetate and 11 parts of zinc acetate dihydrate in 1000 parts of water, and stirring for 30min to obtain a uniform copper acetate/zinc acetate solution for later use;
(3) Adding the copper acetate/zinc acetate solution obtained in the step (2) into the cellulose nanocrystalline dispersion liquid obtained in the step (1), and stirring for 2 hours at room temperature to obtain a uniform blending liquid for later use;
(4) 21 parts of trimesic acid is taken and added into 9000 parts of water, and stirred for 5min at 100 ℃ to obtain a uniform trimesic acid solution for standby;
(5) Adding the trimesic acid solution obtained in the step (4) into the blending solution obtained in the step (3), stirring and reacting for 30min at 100 ℃, and then sequentially carrying out centrifugal separation, washing with deionized water and drying to obtain the functionalized modified cellulose nanocrystalline (the color of which is green).
The invention also provides a preparation method of the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film, which comprises the following steps:
(1) Adding 40 parts of potato starch and 160 parts of polyvinyl alcohol into 5000 parts of deionized water, and stirring at 95 ℃ for 60min to obtain a uniform blending solution for later use;
(2) Dispersing 2-10 parts of functionalized modified cellulose nanocrystalline in 1000 parts of deionized water, and stirring at room temperature for 60min to obtain uniform dispersion liquid for later use;
(3) Adding the dispersion liquid obtained in the step (2) into the blending solution obtained in the step (1), and stirring for 60min at 95 ℃ to obtain uniform film forming liquid for later use;
(4) Pouring the film forming liquid obtained in the step (3) into a flat-bottom glass dish, and drying in an oven at 50 ℃ for 24 hours to obtain the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film.
The application of the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film can be used in the fields of food packaging, intelligent materials, ammonia gas detection, environment monitoring, safety and the like.
Compared with the prior art, the invention has the following beneficial effects:
the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film prepared by the invention has excellent compatibility, mechanical strength, elongation at break, toughness, ultraviolet blocking, high-energy blue light blocking, ammonia response color change, biodegradability and other performances, can maintain higher visible light transparency, can be used as an intelligent indicating material for timely and effectively indicating the change condition of freshness of meat foods (such as shrimps) in the storage process, has simple preparation process, environment friendliness and low cost, is suitable for amplified production, and has wide application value in the fields of food packaging, intelligent materials, ammonia detection, environmental monitoring, safety field and the like.
Drawings
FIG. 1 is a scanning electron microscope image of a functionalized modified cellulose nanocrystal in accordance with the present invention;
FIG. 2 is a Fourier infrared spectrum of a cellulose nanocrystal and a functionalized modified cellulose nanocrystal according to the present invention;
FIG. 3 is a scanning electron microscope image of a brittle section of a polyvinyl alcohol/starch composite film prepared in comparative example and a brittle section of a polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film prepared in example 3.
Detailed Description
The present invention will now be described in more detail by way of examples, which are given by way of illustration only and are not to be construed as limiting the scope of the invention, which is defined by the appended claims.
In the following specific examples and comparative examples formulations, preparation methods, the potato starch was a product offered by rohn reagent limited; polyvinyl alcohol is a product (model: PVA 2699) offered by Shanghai Yijia practice Co., ltd; the cellulose nanocrystalline is a product provided by Gui Linji macro-technology Co., ltd, and has a diameter of 4-10 nm and a length of 100-500 nm; copper acetate, zinc acetate dihydrate are analytically pure grade reagents supplied by the company of the sciences, the company of the ridge; trimesic acid is an analytically pure grade reagent supplied by rohn reagent limited.
In the following specific examples and comparative example formulations, preparation methods, the preparation method of the functionalized modified cellulose nanocrystals comprises the following steps:
(1) Dispersing 30 parts of cellulose nanocrystalline in 5000 parts of deionized water, and stirring for 30min at room temperature to obtain uniform cellulose nanocrystalline dispersion for later use;
(2) Dissolving 10 parts of copper acetate and 11 parts of zinc acetate dihydrate in 1000 parts of water, and stirring for 30min to obtain a uniform copper acetate/zinc acetate solution for later use;
(3) Adding the copper acetate/zinc acetate solution obtained in the step (2) into the cellulose nanocrystalline dispersion liquid obtained in the step (1), and stirring for 2 hours at room temperature to obtain a uniform blending liquid for later use;
(4) 21 parts of trimesic acid is taken and added into 9000 parts of water, and stirred for 5min at 100 ℃ to obtain a uniform trimesic acid solution for standby;
(5) Adding the trimesic acid solution obtained in the step (4) into the blending solution obtained in the step (3), stirring and reacting for 30min at 100 ℃, and then sequentially carrying out centrifugal separation, washing with deionized water and drying to obtain the functionalized modified cellulose nanocrystalline (the color of which is green).
Example 1
The polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film is characterized by comprising the following components in parts by weight: 40 parts of potato starch, 160 parts of polyvinyl alcohol and 2 parts of functionalized modified cellulose nanocrystalline.
The preparation method comprises the following steps:
(1) Adding 40 parts of potato starch and 160 parts of polyvinyl alcohol into 5000 parts of deionized water, and stirring at 95 ℃ for 60min to obtain a uniform blending solution for later use;
(2) Dispersing 2 parts of functionalized modified cellulose nanocrystals in 1000 parts of deionized water, and stirring at room temperature for 60min to obtain uniform dispersion for later use;
(3) Adding the dispersion liquid obtained in the step (2) into the blending solution obtained in the step (1), and stirring for 60min at 95 ℃ to obtain uniform film forming liquid for later use;
(4) Pouring the film forming liquid obtained in the step (3) into a flat-bottom glass dish, and drying in an oven at 50 ℃ for 24 hours to obtain the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film.
Example 2
The polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film is characterized by comprising the following components in parts by weight: 40 parts of potato starch, 160 parts of polyvinyl alcohol and 6 parts of functionalized modified cellulose nanocrystalline.
The preparation method comprises the following steps:
(1) Adding 40 parts of potato starch and 160 parts of polyvinyl alcohol into 5000 parts of deionized water, and stirring at 95 ℃ for 60min to obtain a uniform blending solution for later use;
(2) Dispersing 6 parts of functionalized modified cellulose nanocrystals in 1000 parts of deionized water, and stirring at room temperature for 60min to obtain uniform dispersion for later use;
(3) Adding the dispersion liquid obtained in the step (2) into the blending solution obtained in the step (1), and stirring for 60min at 95 ℃ to obtain uniform film forming liquid for later use;
(4) Pouring the film forming liquid obtained in the step (3) into a flat-bottom glass dish, and drying in an oven at 50 ℃ for 24 hours to obtain the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film.
Example 3
The polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film is characterized by comprising the following components in parts by weight: 40 parts of potato starch, 160 parts of polyvinyl alcohol and 10 parts of functionalized modified cellulose nanocrystalline.
The preparation method comprises the following steps:
(1) Adding 40 parts of potato starch and 160 parts of polyvinyl alcohol into 5000 parts of deionized water, and stirring at 95 ℃ for 60min to obtain a uniform blending solution for later use;
(2) Dispersing 10 parts of functionalized modified cellulose nanocrystals in 1000 parts of deionized water, and stirring at room temperature for 60min to obtain uniform dispersion for later use;
(3) Adding the dispersion liquid obtained in the step (2) into the blending solution obtained in the step (1), and stirring for 60min at 95 ℃ to obtain uniform film forming liquid for later use;
(4) Pouring the film forming liquid obtained in the step (3) into a flat-bottom glass dish, and drying in an oven at 50 ℃ for 24 hours to obtain the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film.
Comparative example
As a comparative standard to the above examples, the present invention provides a polyvinyl alcohol/starch composite film prepared without functionalized modified cellulose nanocrystals, comprising the steps of:
(1) Adding 40 parts of potato starch and 160 parts of polyvinyl alcohol into 5000 parts of deionized water, and stirring at 95 ℃ for 60min to obtain uniform film forming liquid for later use;
(2) Adding 1000 parts of deionized water into the blending solution obtained in the step (1), and stirring for 60min at 95 ℃ to obtain uniform film forming liquid for later use;
(3) Pouring the film forming liquid obtained in the step (2) into a flat-bottom glass dish, and drying in an oven at 50 ℃ for 24 hours to obtain the polyvinyl alcohol/starch composite film.
Structure and performance testing:
the structure and performance of the polyvinyl alcohol/starch composite film material prepared in the comparative example and the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film material prepared in the example are tested, wherein ultraviolet visible performance is tested by an ultraviolet visible spectrometer (Lamdba 365, platinum eimer instruments) and the average transmittance of ultraviolet is calculated by referring to GB/T18830-2009; tensile properties were tested according to GB/T1040-2006; the ammonia response test method is as follows: the sample material was exposed to an ammonia atmosphere and the color change of the sample material was observed.
The above performance test data are shown in the table.
Table 1 sample performance test data
| Group of | Example 1 | Example 2 | Example 3 | Comparative example |
| Ultraviolet average transmittance (%) | 36.6 | 16.2 | 11.8 | 59.1 |
| High-energy blue light average transmittance (%) | 64.8 | 35.6 | 28.3 | 69.0 |
| Tensile Strength (MPa) | 25.1 | 27.6 | 31.3 | 22.9 |
| Elongation at break (%) | 114.2 | 126.7 | 162.8 | 80.9 |
| Toughness (MJ/m) 3 ) | 24.5 | 27.5 | 35.7 | 20.7 |
| Moisture vapor transmission rate (10) -7 g/m.h.Pa) | 3.15 | 2.72 | 1.73 | 3.27 |
The brittle sections of the polyvinyl alcohol/starch composite film material prepared in the comparative example and the brittle sections of the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film material prepared in the example 3 are observed and analyzed by using a scanning electron microscope, and the results are shown in fig. 3. As can be seen from the graph, for the polyvinyl alcohol/starch composite film material prepared in the comparative example, a rough and uneven appearance of the brittle fracture surface can be observed, and more dispersed phase particles (starch particles) with larger particle sizes are provided, which indicates that the compatibility between the polyvinyl alcohol and the starch is poor, and the two-phase interface bonding effect of the polyvinyl alcohol/starch is weak. For the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film material prepared in example 3, the brittle fracture surface of the composite film material is observed to be relatively uniform, smooth and compact, and no obvious disperse phase particles (starch particles) are displayed, namely, the phase morphology structure of the system is obviously improved, the two-phase interface bonding effect of the polyvinyl alcohol/starch is obviously improved, and the improvement of mechanical properties is facilitated. Namely, after the functionalized cellulose nanocrystalline is added into the polyvinyl alcohol/starch blending system, the compatibility of the polyvinyl alcohol/starch blending system can be effectively improved, and the two-phase interface bonding effect of the polyvinyl alcohol/starch can be improved.
The ammonia response test experiment results prove that the polyvinyl alcohol/starch composite film material prepared by the comparative example is colorless and transparent, and has no color change or colorless and transparent optical properties after being exposed to ammonia environment; the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film material prepared in example 1 is light green, and changes into light blue after being exposed to ammonia gas environment; the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film material prepared in example 2 is green, and changes into blue after being exposed to ammonia gas environment; the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film material prepared in example 3 is green, and changes its color to blue after being exposed to ammonia gas environment. After the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film material with the ammonia response color change is placed in an environment with the relative humidity of 90%, the color of the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film material can be recovered to be light green or green before the ammonia response, and after the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film material is exposed in the ammonia environment, the color of the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film material is changed into light blue or blue again, so that the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film material has reversible ammonia response color change performance and can be reused.
In a word, as shown by sample performance test data (see table 1), the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film material prepared by the invention has excellent mechanical strength, elongation at break, toughness, ultraviolet obstruction, high-energy blue light obstruction, water vapor obstruction, ammonia response discoloration, biodegradability and other performances, can also maintain higher visible light transparency, can be used as an intelligent indication material to effectively indicate the freshness change condition of meat foods such as shrimps in the storage process, and has the advantages of simple preparation process, environmental protection, low cost, suitability for amplified production, and wide application value in the fields of food packaging, intelligent materials, ammonia detection, environmental monitoring, safety and the like.
The content of the invention is not limited to the examples listed, and any equivalent transformation to the technical solution of the invention that a person skilled in the art can take on by reading the description of the invention is covered by the claims of the invention.
Claims (3)
1. The polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film is characterized by comprising the following components in parts by weight: 40 parts of potato starch, 160 parts of polyvinyl alcohol and 2-10 parts of functionalized modified cellulose nanocrystalline;
the preparation method of the functionalized modified cellulose nanocrystalline comprises the following steps:
(1) Dispersing 30 parts of cellulose nanocrystalline in 5000 parts of deionized water, and stirring for 30min at room temperature to obtain uniform cellulose nanocrystalline dispersion for later use;
(2) Dissolving 10 parts of copper acetate and 11 parts of zinc acetate dihydrate in 1000 parts of water, and stirring for 30min to obtain a uniform copper acetate/zinc acetate solution for later use;
(3) Adding the copper acetate/zinc acetate solution obtained in the step (2) into the cellulose nanocrystalline dispersion liquid obtained in the step (1), and stirring for 2 hours at room temperature to obtain a uniform blending liquid for later use;
(4) 21 parts of trimesic acid is taken and added into 9000 parts of water, and stirred for 5min at 100 ℃ to obtain a uniform trimesic acid solution for standby;
(5) Adding the trimesic acid solution obtained in the step (4) into the blending solution obtained in the step (3), stirring and reacting for 30min at 100 ℃, and then sequentially carrying out centrifugal separation, washing with deionized water and drying to obtain the functionalized modified cellulose nanocrystalline.
2. The method for preparing the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film according to claim 1, characterized by comprising the steps of:
(1) Adding 40 parts of potato starch and 160 parts of polyvinyl alcohol into 5000 parts of deionized water, and stirring at 95 ℃ for 60min to obtain a uniform blending solution for later use;
(2) Dispersing 2-10 parts of functionalized modified cellulose nanocrystalline in 1000 parts of deionized water, and stirring at room temperature for 60min to obtain uniform dispersion liquid for later use;
(3) Adding the dispersion liquid obtained in the step (2) into the blending solution obtained in the step (1), and stirring for 60min at 95 ℃ to obtain uniform film forming liquid for later use;
(4) Pouring the film forming liquid obtained in the step (3) into a flat-bottom glass dish, and drying 24h in a 50 ℃ oven to obtain the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film.
3. The use of the polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film according to claim 1, in the fields of food packaging, smart materials, ammonia gas detection, environmental monitoring and safety.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311215303.0A CN117209933A (en) | 2023-09-20 | 2023-09-20 | Polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film and preparation method and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311215303.0A CN117209933A (en) | 2023-09-20 | 2023-09-20 | Polyvinyl alcohol/starch/functionalized cellulose nanocrystalline composite film and preparation method and application thereof |
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| CN117209933A true CN117209933A (en) | 2023-12-12 |
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