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Method for preparing asymmetric-structure hydrogel in one step by means of difference in viscosity, product of method and application of product

An asymmetric, structured water technology, applied in the field of polymer hydrogels, can solve the problems of difficult to accurately control particle dispersion, high selection requirements, low universality, etc., and achieve high application value and practical operability, Simple preparation method and low cost effect

Active Publication Date: 2019-09-13
TAIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the above methods have certain limitations. Microfluidic synthesis requires high equipment and experimental operations, and the thickness of the two-layer glue is not easy to control; interfacial polymerization and electrophoresis methods have high requirements for the selection of reactive monomers and hybrid polymers. , the universality is not high; the control condition of poor cross-linking density is relatively harsh; the gradient distribution of micro-nano particles needs to add an external force field, and it is not easy to accurately control the particle dispersion

Method used

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  • Method for preparing asymmetric-structure hydrogel in one step by means of difference in viscosity, product of method and application of product
  • Method for preparing asymmetric-structure hydrogel in one step by means of difference in viscosity, product of method and application of product

Examples

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Effect test

Embodiment 1

[0037] Take 0.05g polyvinyl alcohol (PVA-1799) and disperse it in 0.5g water, and dissolve it fully in a water bath at 80°C; weigh 0.4g acrylic acid (AA) and dissolve it in 1.5g water, add 2mg potassium persulfate (KPS) and 3mg N,N-methylenebisacrylamide (MBAA) was sonicated until it was dissolved, put it in an ice-water bath, and after standing for 15 minutes, 15 μL N,N,N',N'-tetramethylethylenediamine (TEMED) was added, and then Inject the above polyvinyl alcohol solution to obtain the reaction solution a, mix the reaction solution a evenly, blow nitrogen gas-vacuumize to remove oxygen, and inject it into a mold after cooling. The mold is composed of two layers of quartz glass and a PTFE separator with a thickness of 2mm.

[0038]Then take 0.113g of N-isopropylacrylamide (NIPAM) and dissolve it in 0.5g of water, then add 1.08mg of potassium persulfate (KPS) and 0.375mg of N,N-methylenebisacrylamide (MBAA) and sonicate until dissolved. Add 20 μL of N,N,N',N'-tetramethylethyle...

Embodiment 2

[0041] Take 0.05g of polyvinyl alcohol (PVA-1799) and disperse it in 0.5g of water, and dissolve it fully in a water bath at 80°C; take 0.113g of N-isopropylacrylamide (NIPAM) and dissolve it in 0.5g of water, then add 1.08mg of potassium persulfate (KPS) and 0.375 mg N,N-methylenebisacrylamide (MBAA) were sonicated until dissolved, 20 μL N,N,N',N'-tetramethylethylenediamine (TEMED) was added, and then injected into the above polyethylene The reaction solution a was obtained from the alcohol solution, mixed evenly, passed through nitrogen, vacuumed to remove oxygen, cooled and poured into a mold. The mold was composed of two layers of quartz glass and a PTFE separator with a thickness of 2mm.

[0042] Then weigh 0.4g of acrylic acid (AA) and dissolve it in 1.5g of water, add 2mg of potassium persulfate (KPS) and 3mg of N,N-methylene bisacrylamide (MBAA) to ultrasonic until dissolved, put it in an ice-water bath, and After standing for 15 minutes, add 15 μL of N,N,N',N'-tetrame...

Embodiment 3

[0044] Take 0.05g of polyvinyl alcohol (PVA-1799) and disperse it in 0.5g of water, and dissolve it fully in a water bath at 80°C; take 0.113g of N-isopropylacrylamide (NIPAM) and dissolve it in 0.5g of water, and then add 1.3mg of potassium persulfate (KPS) and 0.375 mg N,N-methylenebisacrylamide (MBAA) were sonicated until dissolved, 20 μL N,N,N',N'-tetramethylethylenediamine (TEMED) was added, and then injected into the above polyethylene The reaction solution a was obtained from the alcohol solution, mixed evenly, passed through nitrogen, vacuumed to remove oxygen, cooled and poured into a mold. The mold was composed of two layers of quartz glass and a PTFE separator with a thickness of 2 mm.

[0045] Then weigh 0.4g of acrylamide (AAm) and dissolve it in 1g of water, add 2mg of potassium persulfate (KPS) and 3mg of N,N-methylenebisacrylamide (MBAA) to ultrasonic until dissolved, put it in an ice-water bath, and After standing for 15 minutes, add 15 μL of N,N,N',N'-tetrame...

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Abstract

The invention discloses a method for preparing asymmetric-structure hydrogel in one step by means of difference in viscosity. The method comprises the following steps: (1) mixing a solution containinga stimuli-responsive monomer I, an initiator, a crosslinking agent and a catalyst with a polymer solution so as to obtain a high-viscosity reaction solution with a viscosity of 0.5-50 Pa.s; (2) mixing a stimuli-responsive monomer II, an initiator, a crosslinking agent and a catalyst so as to obtain a low-viscosity reaction solution with a viscosity of 0.01-0.2 Pa.s; and (3) under the protection of inert gas, injecting the high-viscosity reaction solution into a mold firstly, then injecting the low-viscosity reaction solution, and performing a polymerization reaction so as to obtain the asymmetric-structure hydrogel. The prepared asymmetric-structure hydrogel with multiple stimulus response has high mechanical properties, and can be applied to design of flexible actuators and sensing elements which are driven by multiple stimulus responses.

Description

technical field [0001] The invention belongs to the technical field of macromolecule hydrogel, and in particular relates to a method for preparing an asymmetric structural hydrogel in one step by using viscosity difference, as well as its product and application. Background technique [0002] Smart hydrogels are the core components of smart soft materials. Hydrogels with stimuli-responsive and "wet-soft" properties can effectively integrate reversible shape changes and good biocompatibility. By regulating environmental changes (such as temperature, pH, light, electric field and ions, etc.), to achieve complex mechanical motions such as bending and winding. Traditional hydrogels are mostly isotropic structures, which can only show simple volume shrinkage / swelling under environmental stimuli, while bilayer hydrogels with asymmetric structures have swelling / deswelling gaps between the two layers of gels. The difference, therefore, exhibits the bending deformation of the hydrog...

Claims

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Application Information

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IPC IPC(8): C08F285/00C08F220/54C08F222/38
CPCC08F285/00C08F220/54
Inventor 肖圣威何志才吴晓慧陈伟黄国波
Owner TAIZHOU UNIV
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