High-strength lignin/polyvinyl alcohol composite antibacterial aquagel and preparation method
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A kind of polyvinyl alcohol, compound antibacterial technology
Active Publication Date: 2019-09-17
SOUTH CHINA UNIV OF TECH
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However, the agglomeration of lignin itself has limited strengthening effect on hydro...
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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 ...
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