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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 hydrogel pollution, reduced sensitivity, difficulty in dissolution of pore-forming agent, etc., and can improve the saturated swelling rate. And, the effect of improving specific surface area and capacity

Inactive Publication Date: 2011-08-31
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 10mL of acetone, 2.0000g of NIPAAm, 0.050g of cross-linking agent (BIS-A) and 0.1mmol of initiator (AIBN) were added to the round-bottomed flask, and nitrogen gas was introduced to exhaust oxygen for 70 minutes (the input volume was 5.6L); The solution was transferred to a cylindrical micro-reactor, placed in a microwave workstation, and a microwave with a frequency of 2450 MHz and a power of 30 W was applied and the reaction temperature was controlled at 70° C. (ie, the set temperature). In the process of microwave action, the reaction system is in the reaction stage of continuous heating under the action of 30W power, and reaches the set temperature of 70℃ 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. At this time, the reaction ends. The subsequent processing is the same as the ordinary water bath method, and the synthesized hydro...

Embodiment 2

[0030] Add 12mL of acetone, 2.0000g of NIPAAm, 0.023g of crosslinking agent (BIS-A) and 0.1mmol of initiator (AIBN) to the round-bottomed flask in turn, bubbling in nitrogen gas for 70 min (inlet volume is 5.6L); The solution was transferred to a cylindrical micro-reactor, 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). In 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 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 time the reaction ends. The subsequent processing work is the same as the ordinary water bath method, and the synthesized hydrogel is labeled as PM-2.

Embodiment 3

[0032] 14mL of acetone, 2.0000g of NIPAAm, 0.050g of crosslinking agent (BIS-A) and 0.1mmol of initiator (AIBN) were added to the round-bottomed flask, and nitrogen was blown into the flask for 70 minutes (the flow rate was 5.6L); The solution was transferred to a cylindrical micro-reactor, 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). In 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 temperature of 90℃ 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, at which time the reaction ends. The subsequent processing is the same as the ordinary water bath method, and the synthesized hydrogel is labele...

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Abstract

The present invention relates to N- isopropyl acrylamide temperature-sensitive hydrogel and a microwave radiation preparation method thereof. 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 m<2> / g, big and middle pore specific surface is 20.48 to 60.19 m<2> / g, pore volume is 0.043 to 0.105 cm<3> / g, average pore size is 31.8 to 50.4. The method of the present invention uses microwave heating technology for preparing temperature-sensitive hydrogel for improving swelling performance and response speed of the temperature-sensitive hydrogel with the advantages of low energy consumption, less time and high efficiency.

Description

Technical field [0001] The present invention involves the preparation method of intelligent polymer materials, especially the method of a microwave radiation preparation of N-isopropylicide (PNIPAAM) thermistor gel. Background technique [0002] Temperature-Sensitive Polymer, that is, heat-sensitive hydrogel is a very eye-catching functional polymer material in recent years.The thermal polymer is near the critical temperature (LCST), and its physical or (and) chemical properties will change.The most studied sensitive hydrogel system at present is the polyacryonic acid-acrylamide system and its cluster. By dependent groups of branches, the thermal polymers can make the thermal polymer composition, the pH value, the electric field, and the light field, etc.A sensitive effect.Therefore, it has extensive application prospects in various fields such as chemistry, physics, biology, and medicine. [0003] In the development technology of thermal polymers, the synthesis and excellent sen...

Claims

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Application Information

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Patent Type & Authority Patents(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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