Preparation method of photo-crosslinking polyvinyl alcohol/nanocrystalline cellulose PVA/CNC compound hydrogel

A technology of nanocrystalline cellulose and composite hydrogel, which is applied in the field of light-cured composite materials enhanced and toughened by adding a photocrosslinking agent, which can solve the problems of low mechanical properties of pure PVA hydrogel and achieve excellent mechanical properties Effect

Active Publication Date: 2017-08-11
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure PVA hydrogels tend to have lower mechanical properties due to the large number of flexible segments in PVA

Method used

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  • Preparation method of photo-crosslinking polyvinyl alcohol/nanocrystalline cellulose PVA/CNC compound hydrogel
  • Preparation method of photo-crosslinking polyvinyl alcohol/nanocrystalline cellulose PVA/CNC compound hydrogel

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Experimental program
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Effect test

Embodiment 1

[0022] (1) Preparation of PVA / CNC mixed solution: Dissolve CNC in deionized water to prepare a suspension with a mass fraction of 1%, and disperse it ultrasonically for 30 minutes in a 100W ultrasonic cleaning machine. Take 3g of PVA and 34.5mL of deionized water in a three-neck flask, stir at 90°C for 2h, after completely dissolving, add 0.02g of CNC, and continue stirring to obtain a PVA / CNC mixed solution.

[0023] (2) Preparation of photocrosslinking PVA / CNC mixed solution: Cool the above step (1) PVA / CNC mixed solution to 60°C, cool down to 60°C, add 0.15g of photocrosslinking agent MBA (N,N'-sub Methylbisacrylamide), after stirring until uniform, add 0.09g of photoinitiator 2959 (2-hydroxy-4-(2-hydroxyethoxy)-2-methylbenzene) and stir for 1h in shading, after standing for defoaming Pour it into a petri dish, and transmit it 6 times at 2 cm / min under a F300 ultraviolet lamp (Fusion UV systems. USA) to obtain a photocrosslinked PVA / CNC mixed solution.

[0024] (3) Prepara...

Embodiment 2

[0026] (1) Preparation of PVA / CNC mixed solution: Dissolve CNC in deionized water to prepare a suspension with a mass fraction of 1%, and disperse it ultrasonically for 30 minutes in a 100W ultrasonic cleaning machine. Take 3g of PVA and 34.5mL of deionized water in a three-neck flask, stir at 90°C for 2 hours, after completely dissolving, add 0.03g of CNC, and continue stirring to obtain a PVA / CNC mixed solution.

[0027] (2) Preparation of photocrosslinking PVA / CNC mixed solution: Cool the above step (1) PVA / CNC mixed solution to 60°C, cool down to 60°C, add 0.30g of photocrosslinking agent MBA (N,N'-sub Methyl bisacrylamide), after stirring until uniform, add 0.15g of photoinitiator 2959 (2-hydroxy-4-(2-hydroxyethoxy)-2-methylbenzene) and stir for 1h in shading, after standing for defoaming Pour it into a petri dish, and irradiate it under UV-1000IWATA ultraviolet point light source for 300s to obtain a photocrosslinked PVA / CNC mixed solution.

[0028] (3) Preparation of p...

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Abstract

The invention discloses a preparation method of photo-crosslinking polyvinyl alcohol/nanocrystalline cellulose PVA/CNC compound hydrogel and belongs to the macromolecular material field and the photosensitive material field. The preparation method includes: adding natural polymer CNC into a PVA solution to obtain a PVA/CNC mixed solution; adding N,N'-methylenebisacrylamide (MBA) containing a carbon-carbon double bond and an amino group into the mixed solution to allow the MBA to have hydrogen-bond interaction with the PVA and CNC, performing polymerization under the ultraviolet irradiation at the same time, and performing circulating freezing-unfreezing treatment to obtain the photo-crosslinking PVA/CNC compound hydrogel. The photo-crosslinking PVA/CNC compound hydrogel is capable of improving the mechanical property of PVA hydrogel and allows the PVA hydrogel to be well applied in various fields such as agriculture and gardening, biological medicine and environment protection.

Description

technical field [0001] The invention relates to a method for preparing a photocrosslinked polyvinyl alcohol / nanocrystalline cellulose PVA / CNC composite hydrogel, especially a photocured composite material obtained by adding a photocrosslinking agent, which belongs to the field of polymer composite materials . Background technique [0002] As a high water absorption and high water retention material, hydrogel is widely used in many fields such as agriculture, forestry and horticulture, biomedicine, and environmental protection. However, traditional hydrogels often have disadvantages such as poor strength and low toughness, and the preparation of high-strength and high-toughness hydrogels has always been a research hotspot. [0003] Water-soluble polyvinyl alcohol (PVA) is obtained by hydrolysis of polyvinyl acetate, and its structural formula is -CH 2 CH(OH) n -It is a high molecular polymer with hydroxyl groups. Polyvinyl alcohol (PVA) is a traditional raw material for p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08J3/24C08J3/28C08L29/04C08L1/04C08F291/08C08F222/38C08F2/48
CPCC08F2/48C08F251/02C08F261/04C08J3/075C08J3/246C08J3/28C08J2329/04C08J2401/04C08F222/385
Inventor 白绘宇李章康梁真真李佳欣王玮张胜文石刚东为富刘晓亚
Owner JIANGNAN UNIV
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