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Preparation method of polyurethane/cellulose multifunctional shape memory high-molecular material

A polymer material and polyurethane technology, which is applied in the field of preparation of polyurethane/cellulose multifunctional shape memory polymer materials to achieve the effects of increasing elongation at break, improving shape memory function, and broadening the scope of use

Active Publication Date: 2018-11-13
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the difficulty that existing memory materials cannot achieve polyurethane materials with both high strength and high toughness, and to provide a method for preparing a high-strength and high-toughness polyurethane / cellulose multifunctional shape memory polymer

Method used

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  • Preparation method of polyurethane/cellulose multifunctional shape memory high-molecular material
  • Preparation method of polyurethane/cellulose multifunctional shape memory high-molecular material

Examples

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Effect test

example 1

[0029] (1) Homogeneous functionalization reaction of microcrystalline cellulose

[0030] First configure a new green composite solvent: accurately weigh 19g of 1-allyl, 3-methylimidazolium chloride salt ionic solvent, measure 10ml of absolute ethanol and 5ml of deionized water into a three-necked flask, and use ultrasonic After dispersing for 10 minutes, a clear and transparent composite solution was obtained. Add 1g of silane coupling agent, add dropwise acetic acid to adjust PH=4, then stir magnetically at 80°C for 1 hour to make the silane coupling agent hydrolyze. Then weigh 1g of microcrystalline cellulose and add it to the three-necked flask, continue to stir and react for 3 hours, cool to room temperature, use a Buchner funnel to filter and wash to obtain the filter residue, and wash so many times to remove the incompletely reacted silane coupling agent . Finally, the reacted microcrystalline cellulose was freeze-dried for 48 hours using a freeze dryer to obtain funct...

example 2

[0034] (1) Homogeneous functionalization reaction of microcrystalline cellulose

[0035] Carry out the functionalization reaction of microcrystalline cellulose according to Example 1, accurately weigh 19g of 1-allyl, 3-methylimidazolium chloride salt ionic solvent, measure 12.5ml of absolute ethanol and 5ml of deionized water into the three-necked flask In the process, a clear and transparent composite solution was obtained after ultrasonic dispersion for 10 min. Add 1 g of silane coupling agent, add dropwise acetic acid to adjust the pH to 4.5, and stir magnetically at 80°C for 1 hour to cause hydrolysis of the silane coupling agent. Then weigh 1g of microcrystalline cellulose and add it to the three-necked flask, continue to stir and react for 3 hours, cool to room temperature, use a Buchner funnel to filter and wash to obtain the filter residue, and wash so many times to remove the incompletely reacted silane coupling agent . Finally, the reacted microcrystalline cellulos...

example 3

[0039] (1) Homogeneous functionalization reaction of microcrystalline cellulose

[0040] Carry out the functionalization reaction of microcrystalline cellulose according to Example 1, accurately weigh 19g of 1-allyl, 3-methylimidazolium chloride salt ionic solvent, measure 15ml of absolute ethanol and 5ml of deionized water into a three-necked flask , a clear and transparent composite solution was obtained after ultrasonic dispersion for 10 min. Add 1 g of silane coupling agent, add dropwise acetic acid to adjust the pH to 5, and stir magnetically at 80°C for 1 hour to cause hydrolysis of the silane coupling agent. Then weigh 1g of microcrystalline cellulose and add it to the three-necked flask, continue to stir and react for 3 hours, cool to room temperature, use a Buchner funnel to filter and wash to obtain the filter residue, and wash so many times to remove the incompletely reacted silane coupling agent . Finally, after the reaction, the microcrystalline cellulose was free...

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Abstract

The invention relates to a preparation method of a polyurethane / cellulose multifunctional shape memory high-molecular material. The preparation method comprises following steps: an ion solvent, absolute ethyl alcohol, and deionized water are mixed, and are subjected to ultrasonic dispersion so as to obtain a clear transparent composite solution; a silane coupling agent is added into the clear transparent composite solution, the pH value is adjusted with acetic acid, and the clear transparent composite solution is stirred for hydrolysis reaction of the silane coupling agent; microcrystalline cellulose is added into an obtained solution, full stirring is carried out, and then a Buchner funnel is adopted for filtering; a filter residue is collected, and is introduced into a freezer dryer forfreeze drying so as to obtain functionalized microcrystalline cellulose; and the functionalized microcrystalline cellulose and rhodamine are added into a mixed solution of polyurethane and N-methyl pyrrolidone for stirring. According to the preparation method, the functionalized microcrystalline cellulose, polyurethane, and rhodamine are subjected to solution casting to prepare the polyurethane / cellulose multifunctional shape memory high-molecular material, a double-component heterozygosis network based on cellulose element is constructed, and the polyurethane / cellulose multifunctional shape memory high-molecular material with high strength, high toughness, temperature responsiveness, and ultraviolet light responsiveness is prepared.

Description

technical field [0001] The invention relates to a preparation method of a shape memory polymer material, in particular to a preparation method of a polyurethane / cellulose multifunctional shape memory polymer material. Background technique [0002] Polymeric shape memory materials are a class of stimulus-response materials that rely on shape changes. The stimuli that trigger the shape memory effect can be temperature, electric current, magnetic field, pH value, humidity and light, etc. This kind of material has the characteristics of large deformation and wide range of adjustable mechanical properties, and also has the advantages of low price, light weight and easy processing and molding. In recent years, shape memory polymers have shown great application prospects in the field of smart materials due to their excellent properties, such as smart sensors, smart textile materials, biomedical drug sustained release, and aerospace. Polyurethane (SMPU) is a type of shape memory p...

Claims

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Application Information

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IPC IPC(8): C08L75/04C08L1/04C08K5/17
CPCC08L75/04C08L2201/12C08L1/04C08K5/17
Inventor 付宇蔡晨阳
Owner NANJING FORESTRY UNIV
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