Preparation method of polyimide/sisal cellulose micro-crystalline shape memory composite material

A technology of cellulose microcrystals and composite materials, which is applied in the field of preparation of polyimide/sisal cellulose microcrystal shape memory composite materials, can solve problems that have not been reported in the literature, achieve excellent tensile modulus, and be easy to use. Large-scale promotion and application, the effect of simple operation

Inactive Publication Date: 2018-06-05
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This idea has not been reported in the literature

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  • Preparation method of polyimide/sisal cellulose micro-crystalline shape memory composite material

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Experimental program
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Effect test

Embodiment 1

[0016] (1) The sisal cellulose crystallites were dried in an oven at 100 °C for 3 h to obtain the dried sisal cellulose crystallites.

[0017] (2) Weigh 0.0025 mol of ODA, add it into a three-necked flask, add a clean small magnet, then inject 10 mL of NMP, turn on the magnetic stirrer, adjust the rotation speed to 300 rpm, then add 0.0025 mol of ODPA and the steps (1) For the dried sisal cellulose microcrystals, the whole process of adding raw materials and reagents was completed within 15 min, and then the reaction was stirred at 25 °C for 24 h under a nitrogen atmosphere to obtain a viscous sisal containing sisal The PAA solution of cellulose microcrystals; the consumption of the dried sisal cellulose microcrystals is 1% of the total mass of ODA and ODPA.

[0018] (3) ultrasonically dispersing the PAA solution containing sisal cellulose microcrystals prepared in step (2) for 30 min, and after the ultrasonic dispersion is completed, evenly smear the PAA solution containing s...

Embodiment 2

[0020] (1) The sisal cellulose crystallites were dried in an oven at 100 °C for 3 h to obtain the dried sisal cellulose crystallites.

[0021] (2) Weigh 0.0025 mol of ODA, add it into a three-necked flask, add a clean small magnet, then inject 10 mL of NMP, turn on the magnetic stirrer, adjust the rotation speed to 300 rpm, then add 0.0025 mol of ODPA and the steps (1) For the dried sisal cellulose microcrystals, the whole process of adding raw materials and reagents was completed within 15 min, and then the reaction was stirred at 25 °C for 24 h under a nitrogen atmosphere to obtain a viscous sisal containing sisal PAA solution of cellulose microcrystal; the consumption of the dried sisal cellulose microcrystal is 1.5% of the total mass of ODA and ODPA.

[0022] (3) ultrasonically dispersing the PAA solution containing sisal cellulose microcrystals prepared in step (2) for 30 min, and after the ultrasonic dispersion is completed, evenly smear the PAA solution containing sisal...

Embodiment 3

[0024] (1) The sisal cellulose crystallites were dried in an oven at 100 °C for 3 h to obtain the dried sisal cellulose crystallites.

[0025] (2) Weigh 0.0025 mol of ODA, add it into a three-necked flask, add a clean small magnet, then inject 10 mL of NMP, turn on the magnetic stirrer, adjust the rotation speed to 300 rpm, then add 0.0025 mol of ODPA and the steps (1) For the dried sisal cellulose microcrystals, the whole process of adding raw materials and reagents was completed within 15 min, and then the reaction was stirred at 25 °C for 24 h under a nitrogen atmosphere to obtain a viscous sisal containing sisal The PAA solution of cellulose microcrystals; the consumption of the dried sisal cellulose microcrystals is 2% of the total mass of ODA and ODPA.

[0026] (3) ultrasonically dispersing the PAA solution containing sisal cellulose microcrystals prepared in step (2) for 30 min, and after the ultrasonic dispersion is completed, evenly smear the PAA solution containing s...

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Abstract

The invention discloses a preparation method of a polyimide/sisal cellulose micro-crystalline shape memory composite material. The preparation method comprises the following steps: putting sisal cellulose micro-crystalline into a baking oven and drying at the temperature of 100 DEG C for 2 to 4 hours to obtain dried sisal cellulose micro-crystalline; then mixing the dried sisal cellulose micro-crystalline with ODA, ODPA and NMP, adding a mixture into a three-neck boiling flask, stirring and reacting at 25 DEG C in the atmosphere of nitrogen for 24 hours to obtain a viscous PPA solution containing the sisal cellulose micro-crystalline; carrying out ultrasonic dispersion for 30 minutes and uniformly smearing the PPA solution containing the sisal cellulose micro-crystalline on a horizontal mold, and then putting the mold into the baking oven for carrying out thermal amination reaction; after the reaction is ended, naturally cooling the baking oven to a room temperature, taking out the mold and separating a film, namely the polyimide/sisal cellulose micro-crystalline composite material. The method disclosed by the invention is simple in operation and easy for large-scale popularizationand application; in addition, the prepared polyimide/sisal cellulose micro-crystalline composite material has the advantages of excellent tensile modulus and heat resistance and certain shape memoryproperties.

Description

technical field [0001] The invention belongs to the technical field of intelligent composite materials, and particularly relates to a preparation method of a polyimide / sisal cellulose microcrystalline shape memory composite material. Background technique [0002] The shape memory switching temperature of traditional shape memory polymers is generally lower than 150 °C, which limits its application in engineering, especially in the aerospace industry. In order to meet the application requirements of shape memory polymers in harsh environments (such as high temperature, space irradiation, etc.), shape memory polymers have become a research hotspot in recent years, and the most typical representative is polyimide (PI). PI has a series of advantages such as excellent thermal stability, chemical stability, electrical insulation, high glass transition temperature, high mechanical strength and radiation resistance. Sisal cellulose microcrystalline has the characteristics of enviro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08L1/04C08J5/18C08G73/10
Inventor 李裕琪徐旭陆绍荣韦春
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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