N-isopropyl acrylamide thermosensitive aquagel and its microwave radiation preparing method

A technology of isopropylacrylamide and heat-sensitive hydrogel, which is applied in the field of preparation of intelligent polymer materials, can solve the problems of reducing sensitivity, hydrogel pollution, and difficulty in dissolution of pore-forming agents, and achieves the improvement of specific surface area and Capacity, the effect of increasing the saturation swelling rate and

Inactive Publication Date: 2007-11-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses a pore-forming agent to improve the pore structure of the hydrogel, and it is necessary to select a suitable pore-forming material; in addition, the degree of dispersion of the pore-forming agent will directly affect the final pore formation state of the material.
In addition, due to the intertwining and entanglement of polymer chains in the hydrogel network, it is often difficult to dissolve the pore-forming agent. Sometimes in order to fully dissolve the pore-forming agent from the hydrogel network, it is often necessary to add Other reagents can easily contaminate the hydrogel and reduce its original sensitive performance

Method used

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  • N-isopropyl acrylamide thermosensitive aquagel and its microwave radiation preparing method
  • N-isopropyl acrylamide thermosensitive aquagel and its microwave radiation preparing method
  • N-isopropyl acrylamide thermosensitive aquagel and its microwave radiation preparing method

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Effect test

Embodiment 1

[0028] 10mL acetone, 2.0000g NIPAAm, 0.050g cross-linking agent (BIS-A) and 0.1mmol initiator (AIBN) were added into the round bottom flask successively, and nitrogen was introduced to exhaust oxygen for 70min (introduction volume was 5.6L); then The solution was transferred to a cylindrical microreactor, placed in a microwave workstation, and a microwave with a frequency of 2450MHz and a power of 30W was applied and the reaction temperature was controlled at 70°C (ie, the set temperature). During the microwave action, the reaction system is in the reaction stage of continuous heating under the action of 30W power, and reaches the set reaction temperature of 70°C in 60s. Then the microwave enters the constant temperature reaction stage, and the temperature of the reaction solution is kept at 70°C. This process lasts for 60 minutes and then stops, and the reaction ends at this time. The follow-up treatment is the same as the common water bath method, and the synthesized hydroge...

Embodiment 2

[0030] 12mL acetone, 2.0000g NIPAAm, 0.023g cross-linking agent (BIS-A) and 0.1mmol initiator (AIBN) were added into the round bottom flask successively, and nitrogen gas was introduced to exhaust oxygen for 70min (introduction volume was 5.6L); then The solution was transferred to a cylindrical microreactor, placed in a microwave workstation, and a microwave with a frequency of 2450 MHz and a power of 100 W was applied and the reaction temperature was controlled at 80° C. (ie, the set temperature). During the process of microwave action, the reaction system is in the reaction stage of continuous heating under the action of 100W power, and reaches the set reaction temperature of 80°C in 53s. Then the microwave enters the constant temperature reaction stage, and the temperature of the reaction solution is kept at 80°C. This process lasts for 30 minutes and then stops, at which point the reaction ends. The follow-up treatment is the same as the common water bath method, and the ...

Embodiment 3

[0032] 14mL acetone, 2.0000g NIPAAm, 0.050g cross-linking agent (BIS-A) and 0.1mmol initiator (AIBN) were added into the round bottom flask successively, and nitrogen gas was introduced to exhaust oxygen for 70min (introduction volume was 5.6L); then The solution was transferred to a cylindrical microreactor, placed in a microwave workstation, and a microwave with a frequency of 2450 MHz and a power of 200 W was applied and the reaction temperature was controlled at 90° C. (ie, the set temperature). During the process of microwave action, the reaction system is in the reaction stage of continuous heating under the action of 200W power, and reaches the set reaction temperature of 90°C in 45s. Then the microwave enters the constant temperature reaction stage, and the temperature of the reaction solution is kept at 90°C. This process lasts for 60 minutes and then stops, and the reaction ends at this time. The follow-up treatment is the same as the common water bath method, and th...

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Abstract

This invention relates to N- isopropyl acrylamide temperature sensitive hydrogel and its microwave radiation preparation method. The method is that: add monomer N- isopropyl acrylamide, cross-linking agent N, N'-methylene bisacrylamide and initiator 2,2-azobisisobutyronitrile to acetone, inlet nitrogen to drive oxygen; then put it to microwave workstation, at frequency for 2450MHz, power for 30 to 60W to prepare; the gained hydrogel possesses regular middle pore size distribution; BET specific surface is 46.15 to 102.77 sq m/g, big and middle pore specific surface is 20.48 to 60.19 sq m/g, pore volume is 0.043 to 0.105 cu mm/g, average pore size is 31.8 to 50.4.

Description

technical field [0001] The invention relates to a preparation method of an intelligent polymer material, in particular to a method for preparing N-isopropylacrylamide (PNIPAAm) thermosensitive hydrogel by microwave radiation. Background technique [0002] Temperature-Sensitive Polymer (Temperature-Sensitive Polymer), that is, heat-sensitive hydrogel, is a very attractive functional polymer material in recent years. The physical or (and) chemical properties of heat-sensitive polymers will change abruptly near the lower critical solution temperature (LCST). The most studied sensitive hydrogel system is the polyacrylic acid-acrylamide system and its copolymers. By grafting different groups, the thermosensitive polymer can be sensitive to the solvent composition, pH value, electric field and light field in the environment. produce a sensitization effect. Therefore, it has broad application prospects in various fields such as chemistry, physics, biology and medicine. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F4/04C08F2/46C08K5/20
Inventor 赵祯霞李忠夏启斌奚红霞
Owner SOUTH CHINA UNIV OF TECH
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