Preparation method of temperature sensitive poly(N-isopropyl acrylamide)/graphene composite material

A technology of isopropyl acrylamide and composite materials, which is applied in the field of preparation of temperature-sensitive poly/graphene composite materials, can solve the problem of low sensitivity of temperature sensors, and achieve the effect suitable for large areas

Inactive Publication Date: 2019-01-18
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by this invention is to provide a kind of preparation method of thermosensitive poly(N-isopropylacrylamide) / graphene composite material, to overcome the defect that temperature sensor sensitivity is not high in the prior art

Method used

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  • Preparation method of temperature sensitive poly(N-isopropyl acrylamide)/graphene composite material
  • Preparation method of temperature sensitive poly(N-isopropyl acrylamide)/graphene composite material
  • Preparation method of temperature sensitive poly(N-isopropyl acrylamide)/graphene composite material

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Effect test

Embodiment 1

[0030] (1) Weigh 75g of 1mg / ml graphene oxide aqueous solution, use 5%wt sodium carbonate solution to adjust the pH to 9, take 600mg of sodium borohydride and dissolve it in 15g deionized water, add the sodium borohydride aqueous solution to the oxide In the graphene aqueous solution, stir continuously at 80° C. for 1 h. After the reaction is completed, centrifuge and wash with deionized water for 3 times, and disperse into 75 g of water again. Weigh and mix 46mg sulfanilic acid, 18mg sodium nitrite, 0.5g 1M hydrochloric acid, 10g deionized water, add the mixed solution to the pre-reduced graphene oxide aqueous dispersion, stir continuously in an ice-water bath for 2h, and the reaction ends Afterwards, it was centrifuged and washed 3 times with deionized water, and dispersed into 75 g of deionized water again. Weigh 3.125g of hydrazine hydrate and add it to the above-mentioned graphene aqueous solution for secondary reduction. Stir continuously at 100°C for 24 hours. After the...

Embodiment 2

[0036] (1) Weigh the 4mg / ml graphene oxide aqueous solution of 75g, use the sodium carbonate solution of 5%wt to adjust the pH to 10, get the sodium borohydride of 2.4g and dissolve it in 60g deionized water, add the sodium borohydride aqueous solution to In the graphene oxide aqueous solution, stir continuously at 80° C. for 1 h. After the reaction is completed, wash with deionized water for 3 times, and then disperse into 75 g of water again. Weigh and mix 92mg sulfanilic acid, 36mg sodium nitrite, 1g 1M hydrochloric acid, 20g deionized water, add the mixed solution to the pre-reduced graphene oxide aqueous dispersion, stir continuously in the ice-water bath for 2h, after the reaction , washed three times by centrifugation with deionized water, and dispersed in 75 g of deionized water again. Weigh 6.25g of hydrazine hydrate and add it to the above-mentioned graphene aqueous solution for secondary reduction. Stir continuously at 100°C for 24h. After the reaction is over, wash...

Embodiment 3

[0039] (1) Weigh 75g of 20mg / ml graphene oxide aqueous solution, use 5%wt sodium carbonate solution to adjust the pH to 11, take 12g of sodium borohydride and dissolve it in 300g deionized water, add the sodium borohydride aqueous solution to the oxide In the graphene aqueous solution, stir continuously at 80° C. for 1 h. After the reaction is completed, centrifuge and wash with deionized water for 3 times, and disperse into 75 g of water again. Weigh and mix 920mg sulfanilic acid, 360mg sodium nitrite, 10g 1M hydrochloric acid, 200g deionized water, add the mixed solution to the water dispersion of pre-reduced graphene oxide, stir continuously in an ice-water bath for 2h, after the reaction , washed three times by centrifugation with deionized water, and dispersed in 75 g of deionized water again. Weigh 62.5g of hydrazine hydrate and add it to the above-mentioned graphene aqueous solution for secondary reduction. Stir continuously at 100°C for 24h. After the reaction is over,...

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Abstract

The invention relates to a preparation method of a temperature sensitive poly(N-isopropyl acrylamide) / graphene composite material. The preparation method comprises the following steps: pre-reducing agraphene oxide dispersion solution, and adding aryl diazonium salt of sulphanilic acid to sulfonate for secondary reduction to obtain an aqueous graphene oxide dispersion solution; and then mixing N-isopropyl acrylamide, ethylene glycol, ethanol, an initiator and a catalyst and adding a curing agent to cure. The preparation method has the advantages of being efficient and feasible, suitable for being prepared in a large area on a large scale and the like. The obtained composite material has relatively high temperature sensitivity, and the resistance of the composite material is obviously reduced along with rise of temperature. The sensitivity can reach -4% / DEG C.

Description

technical field [0001] The invention belongs to the field of preparation of intelligent hydrogel composite materials, in particular to a preparation method of temperature-sensitive poly(N-isopropylacrylamide) / graphene composite materials. Background technique [0002] Temperature sensors accompany people in all aspects from production to life. The premise of temperature control is to monitor the temperature in real time. Most of the traditional temperature sensors are inorganic semiconductor materials and alloys. These sensors are not high in themselves, and it is difficult to apply the monitoring with high temperature accuracy, such as the monitoring of wound surface temperature. Therefore, it is meaningful to seek to prepare high-sensitivity temperature sensors. With the concept of "smart clothing", all kinds of smart materials have aroused researchers' exploration of smart materials. In particular, smart composite hydrogel materials have a wide range of applications in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/54C08F222/38C08F2/44C08K9/02C08K9/04C08K3/04
CPCC08F2/44C08F220/54C08K9/02C08K9/04C08K3/042C08F222/385
Inventor 王宏志张伟李耀刚张青红侯成义
Owner DONGHUA UNIV
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