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High-strength lignin/polyvinyl alcohol composite antibacterial aquagel and preparation method

A kind of polyvinyl alcohol, compound antibacterial technology

Active Publication Date: 2019-09-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the agglomeration of lignin itself has limited strengthening effect on hydrogel, and the simple introduction of lignin cannot impart effective antibacterial properties.

Method used

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  • High-strength lignin/polyvinyl alcohol composite antibacterial aquagel and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take 4.5 parts by mass of polyvinyl alcohol, 0.5 parts by mass of lignin, add 72.4 parts by volume of water; 18.1 parts by volume of DMSO solution, heat at 70°C, stir mechanically at 100rpm for 1h, pour the fully dissolved mixed solution into the mold, and heat at room temperature Freeze for 12 hours after natural cooling, thaw for 2 hours, soak the thawed composite hydrogel in deionized water for 24 hours for solvent exchange, and then soak the solvent-exchanged composite hydrogel in 0.01mol / L silver nitrate solution 1h, then soak it in 0.1mol / L sodium citrate for 1h, and finally obtain the finished product of lignin / polyvinyl alcohol / silver composite hydrogel. Wherein, the selected lignin is lignosulfonic acid, a by-product of sulfite pulping.

Embodiment 2

[0035] Take 5 parts by mass of polyvinyl alcohol, 0.5 parts by mass of lignin, add 66.15 parts by volume of water; 28.35 parts by volume of DMSO solution, heat at 80°C, stir mechanically at 120rpm for 2h, pour the fully dissolved mixed solution into the mold, and heat at room temperature Freeze for 12 hours after natural cooling, thaw for 2 hours, soak the thawed composite hydrogel in deionized water for 24 hours for solvent exchange, and then soak the solvent-exchanged composite hydrogel in 0.02mol / L silver nitrate solution 2h, then soak it in 0.2mol / L dopamine for 2h, and finally obtain the finished product of lignin / polyvinyl alcohol / silver composite hydrogel. Wherein, the selected lignin is lignosulfonic acid, a by-product of sulfite pulping.

Embodiment 3

[0037]Take 5.5 parts by mass of polyvinyl alcohol, 1.5 parts by mass of lignin, add 55.8 parts by volume of water; 37.2 parts by volume of DMSO solution, heat at 90°C, stir mechanically at 300rpm for 3h, pour the fully dissolved mixed solution into the mold, and heat at room temperature Freeze for 12 hours after natural cooling, thaw for 2 hours, soak the thawed composite hydrogel in deionized water for 24 hours for solvent exchange, and then soak the solvent-exchanged composite hydrogel in 0.03mol / L silver nitrate solution 3h, then soak it in 0.3mol / L sodium citrate for 3h, and finally obtain the finished product of lignin / polyvinyl alcohol / silver composite hydrogel. Wherein, the selected lignin is lignosulfonic acid, a by-product of sulfite pulping.

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Abstract

The invention belongs to the technical field of macromolecular materials and discloses high-strength lignin / polyvinyl alcohol composite antibacterial aquagel and a preparation method therefor. The composite antibacterial aquagel disclosed by the invention is lignin reinforced PVA aquagel. The high-strength lignin / polyvinyl alcohol composite antibacterial aquagel is obtained specifically through mixing lignin with PVA to prepare gel A, and then, carrying out water-soluble silver salt solution soaking and reducer reduction sequentially. According to the high-strength lignin / polyvinyl alcohol composite antibacterial aquagel and the preparation method therefor, through adding the lignin into polyvinyl alcohol aquagel, a nano micro-phase separating structure is formed through self assembly, and meanwhile, the adsorption to Ag<+> is promoted; and Ag<+> adsorbed to the external surface of the aquagel is reduced by a reducer, and thus, dense nano silver particle clusters are formed on the surface of the aquagel. Due to a tight external structure and a loose internal structure, the aquagel can have ultrahigh mechanical strength and toughness and excellent electric conductivity and antibacterial performance, and the tensile strength reaches up to 13.0MPa; the elongation at break reaches up to 1500%; and the electric conductivity reaches up to 10.126S / m.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a high-strength lignin / polyvinyl alcohol composite antibacterial hydrogel and a preparation method thereof. Background technique [0002] Hydrogel, a swollen body with a three-dimensional polymer network structure, is formed by physical cross-linking or chemical cross-linking, contains a large amount of water but is insoluble in water [Science., 2017, 356, (6337).], has a A series of advantages, including softness, rich water content and good biocompatibility, etc. Hydrogels are widely used in biomedicine, tissue engineering, flexible electronics, sensors and other fields [Adv Mater., 2016, 28, (22): 4497.]. However, the poor mechanical properties of traditional hydrogels greatly limit their potential applications in the field of flexible devices. In recent years, a large number of reports have been reported to enhance the mechanical strength of hydrogels ...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08L97/00C08K3/08C08J3/075
CPCC08J3/075C08J2329/04C08J2497/00C08K2003/0806
Inventor 邱学青刘伟峰张晓蔡俊奇黄锦浩杨东杰
Owner SOUTH CHINA UNIV OF TECH
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