Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of ion/chemical hybrid double cross-linked polyacrylic acid high strength hydrogel

A polyacrylic acid and hydrogel technology, which is applied in the field of polymer materials, can solve the problems that cannot meet the needs of use, the performance of the hydrogel mixture is difficult to stabilize, and the tensile strength is low, so as to achieve the effect of improving self-healing performance

Active Publication Date: 2019-04-19
HUBEI UNIV OF TECH
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since ordinary hydrogels usually have disadvantages such as low gel strength, poor toughness, and slow water absorption speed, they cannot meet the needs of use, so the research is further extended to double cross-linked hydrogels.
Lin et al. Lin P, Ma S, Wang X, et al. Molecularly Engineered Dual‐Crosslinked Hydrogel with Ultrahigh Mechanical Strength, Toughness, and Good Self‐Recovery [J]. Advanced Materials, 2015, 27(12): 2054-2059. Polyacrylamide and polyacrylic acid were copolymerized to prepare hybrid double-crosslinked hydrogels by chemical crosslinking and ionic crosslinking. Compared with acrylamide single-network crosslinking, the mechanical properties of copolymerized hybrid crosslinked hydrogels were improved Many times, and also has self-healing properties, but the elongation at break of the copolymerized hybrid cross-linked hydrogel is greatly reduced
Lin et al. Lin Y, He D, Chen Z, et al.Double-crosslinked network design for self-healing, highly stretchable and resilient polymer hydrogels[J].RSC Advances,2016,6(15):12479-12485. Using amphoteric polyurethane The macromonomer is used as a covalent cross-linking agent, and the micelles of sodium lauryl sulfate are used as a physical cross-linking agent to cross-link acrylic acid amide, and a hybrid double-cross-linked copolymer hydrogel is prepared. The elongation at break and self-healing properties of the copolymerized hydrogel are improved, but the tensile strength is lower
Previous studies have shown that the mechanical properties of hydrogels can be significantly improved by means of copolymerization and double cross-linking, but the strength will be increased at the same time as the sacrifice of toughness. All of the above are copolymerization reactions, and the introduction of various polymer composites will form Heterogeneous polymers, only with proper topological structure can have higher mechanical properties, and have higher selectivity to polymer composition and process. At the same time, heterogeneous polymers will make it difficult to stabilize the performance of hydrogel mixtures

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of ion/chemical hybrid double cross-linked polyacrylic acid high strength hydrogel
  • Preparation method of ion/chemical hybrid double cross-linked polyacrylic acid high strength hydrogel
  • Preparation method of ion/chemical hybrid double cross-linked polyacrylic acid high strength hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1): Take 14.398mL of AAc in a glass, add 35.602mL of deionized water, and stir well at room temperature.

[0028] Step 2): take by weighing 0.619g Fe(NO 3 ) 3 9H 2 O, 0.031g of KA, 0.007g of MBAA in a glass, then add 20mL of deionized water in the glass, place in the dark, and stir at room temperature with a glass rod until completely dissolved to prepare a mixed solution.

[0029] Step 3): Pour the mixed solution in step 2) into the AAc solution in step 1) under light-shielding conditions, and stir evenly at room temperature to obtain a mixed solution of AAc monomers. The molar concentration of the mixed solution of AAc obtained at this time is 3mol / L, Fe(NO 3 ) 3 9H 2 The molar concentration of O is 0.022mol / L, the molar concentration of KA (2-ketoglutaric acid) is 0.003mol / L, and the molar concentration of MBAA (N.N'-methylenebisacrylamide) is 0.0006mol / L , and the balance is deionized water.

[0030]4) Inject the AAc monomer mixed solution obtained in st...

Embodiment 2

[0034] Step 1): Take 19.1977mL of AAc in a glass, add 30.8023mL of deionized water, and stir well at room temperature.

[0035] Step 2): take by weighing 0.826g Fe(NO 3 ) 3 9H 2 O, 0.041g of KA, 0.009g of MBAA in a glass, then add 20mL of deionized water in the glass, place in the dark, and stir at room temperature with a glass rod until completely dissolved to prepare a mixed solution.

[0036] Step 3): Pour the mixed solution in step 2) into the AAc solution in step 1) under light-shielding conditions, and stir evenly at room temperature to obtain a mixed solution of AAc monomers. The molar concentration of the mixed solution of AAc obtained at this time is 4mol / L, Fe(NO 3 ) 3 9H 2 The molar concentration of O is 0.029mol / L, the molar concentration of KA is 0.004mol / L, the molar concentration of MBAA is 0.001mol / L, and the balance is deionized water.

[0037] 4) Inject the AAc monomer mixed solution obtained in step 3) into a glass mold at room temperature, and perform...

Embodiment 3

[0041] Step 1): Take 23.997mL of AAc in a glass, add 26.003mL of deionized water, and stir well at room temperature.

[0042] Step 2): take by weighing 1.032g of Fe(NO 3 ) 3 9H 2 O, 0.051g of KA, 0.005g of MBAA in a glass, then add 20mL of deionized water in the glass, place in the dark, and stir at room temperature with a glass rod until completely dissolved to prepare a mixed solution.

[0043] Step 3): Pour the mixed solution in step 2) into the AAc solution in step 1) under light-shielding conditions, and stir evenly at room temperature to obtain a mixed solution of AAc monomers. The molar concentration of the mixed solution of AAc obtained at this time is 5mol / L, Fe(NO 3 ) 3 9H 2 The molar concentration of O is 0.037mol / L, the molar concentration of KA is 0.005mol / L, the molar concentration of MBAA is 0.001mol / L, and the balance is deionized water.

[0044] 4) Inject the AAc monomer mixed solution obtained in step 3) into a glass mold at room temperature, and perfor...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
tensile strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of NaCl solution regulated ionic / chemical hybrid bi-crosslinked polyacrylic high strength hydrogel and solves the problems that an existing high strength hydrogel material is complex in preparation process, long in production period and not high in comprehensive performance. The technical scheme disclosed by the invention is simple. The preparation method comprises the steps of: dissolving an acrylic monomer, iron nitrate nonahydrate, a photoinitiator and a chemical crosslinking agent to obtain a mixed solution; initializing polymerization under an ultraviolet irradiation condition and performing complexing and crosslinking through ferric ions, and meanwhile, performing covalent crosslinking through the chemical crosslinking agent to obtain ionic / chemical hybrid bi-crosslinked hydrogel; and regulating entanglement of bi-crosslinked hydrogel molecular chains by means of a salt ionic solution to obtain the NaCl solution regulated ionic / chemical hybrid bi-crosslinked polyacrylic high strength hydrogel. The preparation method disclosed by the invention not only is extremely simple to operate and high in product strength, but also has good elongation, and can be used as a biological soft tissue substitute.

Description

technical field [0001] The invention belongs to polymer materials, in particular to a preparation method of high-strength hydrogel. Background technique [0002] Hydrogel is a three-dimensional network structure material with high water content and hydrophilicity, which plays a very important role in tissue engineering because of its special properties, such as high water content, better biological Compatibility and stimuli responsiveness, so it has a good prospect in the fields of environmental engineering and smart materials. Since ordinary hydrogels usually have disadvantages such as low gel strength, poor toughness, and slow water absorption speed, which cannot meet the needs of use, the research has been further extended to double-crosslinked hydrogels. Lin et al. Lin P, Ma S, Wang X, et al. Molecularly Engineered Dual‐Crosslinked Hydrogel with Ultrahigh Mechanical Strength, Toughness, and Good Self‐Recovery [J]. Advanced Materials, 2015, 27(12): 2054-2059. Polyacryla...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08J3/24C08F220/06C08F222/38C08F2/48
CPCC08F2/48C08F220/06C08J3/075C08J3/243C08J2333/02C08F222/385
Inventor 李学锋王鹏赵友姣张高文龙世军王慧李荣哲周沉程诗昉
Owner HUBEI UNIV OF TECH