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Preparation method for high-barrier water-resistant polyvinyl alcohol (PVA)/cellulose nanocrystal (CNC)/graphene oxide (GO) composite film

A technology of nanocrystalline cellulose and polyvinyl alcohol, which is applied in the field of polymer materials, can solve the problems of poor water barrier properties and decreased barrier properties, and achieve the effects of improving dispersibility, enhancing mechanical properties and processing properties, and excellent mechanical properties.

Active Publication Date: 2017-03-22
JIANGNAN UNIV
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  • Abstract
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Problems solved by technology

However, the large number of hydroxyl groups contained in the PVA molecular chain also leads to the water sensitivity of PVA, that is, the disadvantages of water resistance and water barrier properties. To improve the water resistance and water barrier properties of PVA films, it needs to be blended or chemically modified. deal with
[0003] Due to the high hydrophilicity of PVA, in the case of high ambient humidity, the hydroxyl group is easy to form hydrogen bonds with water molecules, and the entry of water molecules leads to changes in the aggregated structure of PVA, resulting in a sharp drop in barrier properties, which limits the use in many fields. applications, especially in daily packaging materials

Method used

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  • Preparation method for high-barrier water-resistant polyvinyl alcohol (PVA)/cellulose nanocrystal (CNC)/graphene oxide (GO) composite film

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Preparation of CNC aqueous dispersion: Disperse 1g of CNC in 200mL of deionized water, prepare a CNC solution with a concentration of 0.005g / ml, and disperse it ultrasonically for 30min in a 100W ultrasonic cleaning machine;

[0022] (2) Preparation of GO aqueous dispersion: Disperse 1 g of GO in 200 mL of deionized water, prepare a GO solution with a concentration of 0.005 g / mL, and ultrasonically disperse for 30 min in a 100W ultrasonic cleaner;

[0023] (3) Preparation of CNC and GO composite aqueous dispersion: Mix CNC and GO aqueous dispersion in the above steps (1) and (2) according to the mass ratio of 1:2, 1:1, 2:1, and stir at room temperature for 10 minutes , the concentration of the CNC and GO composite solution was obtained as 0.005g / mL, and then ultrasonically dispersed in a 100W ultrasonic cleaner for 30min to obtain composite dispersions with different mass ratios of CNC and GO;

[0024] (4) Preparation of PVA / CNC / GO composite solution: Dissolve 1g of...

Embodiment 2

[0027] The scanning electron microscope (SEM) characterization was carried out under the S-4800 field emission scanning electron microscope, and the PVA and PVA / CNC / GO composite film samples to be observed were brittlely broken in liquid nitrogen to obtain the cross-section of the sample. After spraying gold on the sample, select a voltage of 2.0kV and a current of 10μA. Under different magnifications, observe the cross-section with a scanning electron microscope to obtain the SEM of the sample. figure 1 .

[0028] figure 1 It is the cross-sectional SEM image of PVA and PVA composite film. It can be seen from the figure that the cross-section of pure PVA film is relatively smooth without obvious wrinkles. From the SEM image of the fracture surface of the binary PVA / 3% (CNC:GO-1:0) composite film, it was found that there was no particle agglomeration, indicating that CNC was well dispersed in the PVA matrix. Comparing the SEM image of the cross-section of the PVA / 3% (CNC:GO-0...

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Abstract

The invention provides a preparation method for a high-barrier water-resistant polyvinyl alcohol (PVA) / cellulose nanocrystal (CNC) / graphene oxide (GO) composite film, and belongs to the field of high polymer materials. According to the preparation method, firstly, CNC aqueous dispersion and GO aqueous dispersion are prepared and then the CNC aqueous dispersion and GO aqueous dispersion are mixed, CNC and GO are evenly dispersed through ultrasounds, hydroxys on the surface of the CNC and polar groups on the surface of the GO interact, the dispersion effect of the GO in PVA is improved, part of hydroxys on PVA chains can be closed through the stable structure formed by the CNC and the GO, and the water resistance of the PVA can be improved; and on the other hand, by means of the two-dimensional flaky GO, the transmission route of water molecules in a PVA film can be increased, and the water barrier property of the PVA film can be improved. The composite film has the excellent water resistance, the excellent water barrier property and the excellent mechanical property, and application of the composite film in the field of biodegradable packaging materials is made possible.

Description

technical field [0001] The invention relates to a preparation method of high barrier and water resistance polyvinyl alcohol / nanocrystalline cellulose / graphene oxide PVA / CNC / GO composite film, especially the high barrier and water resistance composite material obtained by adding CNC and GO, which belongs to high field of molecular materials. Background technique [0002] Polyvinyl alcohol (PVA), a water-soluble polymer obtained by hydrolysis of polyvinyl acetate, has a structural formula of -CH 2 CH(OH) n . Since the main chain of polyvinyl alcohol is a carbon-carbon structure, the side chain contains a large number of hydroxyl groups, which is a strict linear structure and regular structure, so the chemical properties are stable and the mechanical strength of the material is high; the hydrogen bonds between the molecules make it effective Sufficient thermal stability; the hydroxyl group on the molecular chain makes it highly hydrophilic and has a similar solubility parame...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L29/04C08L1/02C08K9/00C08K3/04
CPCC08J5/18C08J2329/04C08J2401/02C08K2201/011C08L29/04C08L2205/035C08L2205/14C08L1/02C08K9/00C08K3/04
Inventor 白绘宇梁真真夏禹王玮张胜文刘晓亚
Owner JIANGNAN UNIV
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