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Preparation method of nano composite hydrogel with rapid temperature response and high mechanical property

A technology of temperature response and nano-composite, which is applied in the field of preparation of nano-composite hydrogels with fast temperature response and high mechanical properties, can solve the problems of damaged mechanical properties and uneven structure of hydrogels, and achieve improved mechanical strength and responsiveness. Simple and controllable effect with fast response rate

Inactive Publication Date: 2015-04-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, freezing polymerization requires the temperature to be lowered below the melting point of the solvent. During the cooling process, leptonite aggregates due to instability in the dispersion, resulting in uneven structure of the polymerized hydrogel and damage to the mechanical properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Disperse 1.5 g Laponte XLS in 9.5 g deoxygenated deionized water, stir for 2 h to obtain a uniform and transparent dispersion; then add 1.13 g monomer NIPAm and continue stirring for 2 h; then pass argon into the reaction liquid After 10 min, add 0.5 mL of initiator potassium persulfate aqueous solution (KPS, 20 mg / mL) and tetramethylethylenediamine (TEMED) 20 mu L, stirred evenly and poured into a glass test tube with a diameter of 6 mm, sealed and immediately frozen in liquid nitrogen for 30 s, and then placed in a refrigerator at -18 °C for 48 h; the reaction product was completely thawed and taken out of the glass test tube to obtain Rapid temperature response and high mechanical performance nanocomposite hydrogels. Directly used to determine the mechanical properties, the elongation at break of the hydrogel is 200%, and the breaking strength is 110 kPa. The hydrogel was soaked in a large amount of deionized water, and the deionized water was replaced regularly to ...

Embodiment 2

[0020] Disperse 1.2 g Laponte XLS in 9.5 g deoxygenated deionized water, stir for 2 h to obtain a uniform and transparent dispersion; then add 1.13 g monomer NIPAm and continue stirring for 2 h; then pass argon into the reaction liquid After 10 min, 0.5 mL of initiator potassium persulfate aqueous solution (KPS, 20 mg / mL) and tetramethylethylenediamine (TEMED) 20 muL, stirred evenly and poured into a glass test tube with a diameter of 6 mm, sealed and immediately frozen in liquid nitrogen for 30 s, and then placed in a refrigerator at -18 °C for 48 h; the reaction product was completely thawed and taken out of the glass test tube to obtain Rapid temperature response and high performance nanocomposite hydrogels. Directly used to determine the mechanical properties, the elongation at break of the hydrogel is 280%, and the breaking strength is 110 kPa. The hydrogel was soaked in a large amount of deionized water, and the deionized water was replaced regularly to remove unreacted...

Embodiment 3

[0022] Disperse 1.0 g of Laponte XLS in 9.5 g of deoxygenated deionized water and stir for 2 h to obtain a uniform and transparent dispersion; then add 1.13 g of monomer NIPAm and continue stirring for 2 h; then pass argon into the reaction liquid for 10 min, add initiator potassium persulfate aqueous solution (KPS, 20 mg / mL) 0.5 mL and tetramethylethylenediamine (TEMED) 20 mu L, stirred evenly and poured into a glass test tube with a diameter of 6 mm, sealed and immediately frozen in liquid nitrogen for 30 s, and then placed in a refrigerator at -18 °C for 48 h; the reaction product was completely thawed and taken out of the glass test tube to obtain Rapid temperature response and high performance nanocomposite hydrogels. Directly used to determine the mechanical properties, the elongation at break of the hydrogel is 300%, and the breaking strength is 90 kPa. The hydrogel was soaked in a large amount of deionized water, and the deionized water was replaced regularly to remov...

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Abstract

The invention discloses a preparation method of nano composite hydrogel with rapid temperature response and high mechanical property. The preparation method comprises the following steps of dispersing inorganic nano particles laponite and monomer N-isopropylacrylamide (NIPAm) into water; removing oxygen and adding an initiator after evenly agitating; packaging the reaction liquid into a die to seal, and rapidly freezing for 10-40 seconds in liquid nitrogen, and then putting the reaction system at the temperature of -8 to -28 DEG C to react for 24-72 hours, so as to obtain a target product. Solvent crystal is utilized as a pore-forming agent by changing polymerization temperature; no other substances and after-treatment are needed; and the preparation process is further simplified; and the reaction is simple and controllable. The prepared hydrogel has the same rapid response and high mechanical property; the response speed and the mechanical property can be adjusted by changing the content of an inorganic cross-linking agent and the freezing reaction temperature; and the preparation method has a wide application range.

Description

technical field [0001] The invention relates to the field of preparation methods of environmentally sensitive polymer materials, in particular to a preparation method of nanocomposite hydrogels with fast temperature response and high mechanical properties. Background technique [0002] Hydrogel is a polymer material with a three-dimensional network structure containing a large amount of water, and has a wide range of applications in the fields of food, daily necessities, and biomedicine. Environmentally responsive hydrogels can be prepared by changing the composition of this three-dimensional network polymer. This hydrogel can sense changes or stimuli in the external environment and produce corresponding changes in physical form or chemical structure, that is, it can produce sensitive responses to external stimuli. Temperature-sensitive hydrogel is a typical smart hydrogel, such as poly N - Isopropylacrylamide (PNIPAm) has a significant volume change at about 32 °C. When ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/54C08F2/44C08K3/34C08J9/28
Inventor 童真郑树典王涛刘新星
Owner SOUTH CHINA UNIV OF TECH
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