Isopropyl acrylamide polyalcohol hydrogel and synthesizing method

A technology of isopropylacrylamide and propylacrylamide, which is applied in the field of isopropylacrylamide polymer hydrogel and its synthesis, can solve the problems of inability to adjust, poor temperature response performance, and narrow application of gel products , to achieve the effect of good elasticity and transparency

Active Publication Date: 2008-10-29
RONGHAI SUPERSONIC MEDICINE EN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the synthetic isopropylacrylamide (NIPA) polymer gel that obtains in the prior art, the transparency of colloid, elasticity, temperature response performance are all relatively poor, mainly be that the proportioning of its component is unreasonable, to the requirement of reaction The temperature and gas environment are not clearly stated, it is not an ideal combination of reaction environment, and the lower critical solution temperature (LCST) cannot be adjusted, so the obtained gel product has a narrow application range and cannot meet the practical requirements in many aspects. application needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: LCST is 32°C

[0041] Raw material ratio:

[0042] Isopropylacrylamide 100.0g

[0043] Initiating reducing agent sodium metabisulfite 0.5g

[0044] Cross-linking agent N, N'-methylenebisacrylamide 1g

[0045] Initiating oxidant ammonium persulfate 0.5g

[0046] Water (deionized water) 898g

[0047] Steps:

[0048] 1) Dissolving isopropylacrylamide monomer in some water;

[0049] 2) Add a crosslinking agent to the solution in step 1), stir and dissolve;

[0050] 3) Initiating oxidizing agent and initiating reducing agent are respectively dissolved in part of water;

[0051] 4) Mix the aqueous solution of isopropylacrylamide monomer with the aqueous solution of crosslinking agent and initiator reducing agent in a vessel;

[0052] 5) Put the utensils into a well-sealed fresh-keeping plastic bag, and replace the surface of the utensils and the surrounding air with nitrogen for 3-5 minutes;

[0053] 6) Add the aqueous solution of initiating oxidant to the...

Embodiment 2

[0057] Example 2: LCST is 40°C

[0058] Raw material ratio:

[0059] Isopropylacrylamide 100.0g

[0060] Low critical solution temperature regulator acrylamide 3.31g

[0061] Initiating reducing agent sodium metabisulfite 0.34g

[0062] Cross-linking agent N, N'-methylenebisacrylamide 1g

[0063] Initiating oxidant ammonium persulfate 0.5g

[0064] Water (deionized water) 895g

[0065] Steps:

[0066] 1) dissolving isopropylacrylamide monomer and acrylamide in some water;

[0067] 2) Add a cross-linking agent to the solution in step 1), and stir to dissolve;

[0068] 3) Initiating oxidizing agent and initiating reducing agent are respectively dissolved in part of water;

[0069] 4) Mix the aqueous solution of isopropylacrylamide monomer with the aqueous solution of crosslinking agent and initiator reducing agent in a vessel;

[0070] 5) Put the utensils into a well-sealed fresh-keeping plastic bag, and replace the surface of the utensils and the surrounding air with n...

Embodiment 3

[0075] Example 3: LCST is 60°C

[0076] Raw material ratio:

[0077] Isopropylacrylamide 100.0g

[0078] Low critical solution temperature regulator acrylamide 15.7g

[0079] Initiating reducing agent sodium metabisulfite 0.4g

[0080] Cross-linking agent N, N'-methylenebisacrylamide 1.2g

[0081] Initiating oxidant ammonium persulfate 0.6g

[0082] Water (deionized water) 882g

[0083] Steps:

[0084] 1) dissolving isopropylacrylamide monomer and acrylamide in some water;

[0085] 2) Add a cross-linking agent to the solution in step 1), and stir to dissolve;

[0086] 3) Initiating oxidizing agent and initiating reducing agent are respectively dissolved in part of water;

[0087] 4) Mix the aqueous solution of isopropylacrylamide monomer with the aqueous solution of crosslinking agent and initiator reducing agent in a vessel;

[0088] 5) Put the utensils into a well-sealed fresh-keeping plastic bag, and replace the surface of the utensils and the surrounding air with ...

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PUM

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Abstract

The invention relates to an N-isopropyl acrylamide (NIPA) polymer hydrogel and a synthetic method thereof. The hydrogel comprises the following components (wt%) of: NIPA 8-15%, low critical solution temperature (LCST) regulator 0-4%, initiation reducer 0.02-0.05%, crosslinker 0.1-0.15%, initiation oxidizer 0.03-0.07%, and water 91.85-80.73%. The synthetic method comprises the steps of: (1) determining the composition of the hydrogel; (2) dissolving an NIPA monomer in part of water to obtain an NIPA monomer aqueous solution; (3) adding the crosslinker in the NIPA monomer aqueous solution; (4) respectively dissolving the initiation reducer and the initiation oxidizer in part of water; (5) mixing the NIPA monomer aqueous solution and the aqueous solution of the initiation reducer in a container; (6) replacing the air on the surface and the surroundings of the container with nitrogen gas; (7) adding the aqueous solution of the initiation oxidizer into the container, mixing, and replacing with nitrogen gas for several minutes; (8) sealing the container, and reacting for several hours to obtain a gel product; and (9) washing with water to remove the toxicity of the residual non-reacted monomer on the surface of the gel product.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to an isopropylacrylamide (NIPA) polymer hydrogel and a synthesis method thereof. Background technique [0002] Polymer gel is a soft and wet material with both liquid and solid properties. It is a multi-component system composed of a three-dimensional cross-linked network of polymers and a small molecule solvent fixed in it. It is a cross-linked polymer swelling body that cannot be melted and has certain elasticity. This material can respond softly to environmental changes, such as pH value, temperature, light intensity, electric field, magnetic field and other stimuli, as well as chemical substances. The polymer gel that can respond softly to changes in environmental temperature is called thermosensitive gel. Thermosensitive gel is a kind of intelligent polymer that can reversibly expand and contract with changes in environmental temperature, and has volume ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/56C08F4/40C08F2/38C08K5/20
Inventor 田耘博王智彪叶方伟
Owner RONGHAI SUPERSONIC MEDICINE EN
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