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Method for preparing magneto type biodegradable shape-memory-polymer nano composite material

A composite material and memory technology is applied in the field of preparation of magnetotropic biodegradable shape memory polymer nanocomposite materials, which can solve the problems of low mechanical strength and small shape recovery stress, and achieve high shape recovery rate and deformation retention ability. Strong, shape memory performance with good repeatability

Inactive Publication Date: 2015-07-01
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, compared with SMAs, SMPs have obvious disadvantages in some aspects - low mechanical strength, small shape recovery stress, etc. Therefore, in order to overcome these shortcomings of SMPs and expand their application fields, the common method is to add Modification with multifunctional high modulus fillers

Method used

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  • Method for preparing magneto type biodegradable shape-memory-polymer nano composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Put 500ml of ethanol and deionized water solution (volume ratio 1:1) in a 1L round bottom flask, 10g Fe 3 o 4 Nanoparticles were dispersed in it, and 5ml (3-(2,3-propylene oxide)propyltrimethylsilane was added, and stirred at 40°C for 4h under the protection of nitrogen. After washing with water and ethanol three times, put them into a vacuum drying oven to dry.

[0028] Put 7.5ml of anhydrous toluene in the sample bottle, and 0.03g of surface-modified Fe 3 o 4 Nanoparticles are dispersed therein. Ultrasonic dispersion 30 ~ 45min. spare.

[0029] Add 8.064g (0.056 mol) of D,L-lactide after three times of recrystallization from vinyl acetate to a 50ml dry round bottom flask, add 0.0126g (1.4×10 -4 mol) butanediol, 15μl stannous octoate (0.001mol / L). Polymerize for 24 hours at 130°C under nitrogen protection. After the reaction was completed, dichloromethane was added to dissolve, and then the product was dropped into iced n-hexane to precipitate and purify the pr...

Embodiment 2

[0033] Fe 3 o 4 The nanoparticle surface modification method is as in Example 1.

[0034] Put 15ml of anhydrous toluene in the sample bottle, and 0.06g of surface-modified Fe 3 o 4 Nanoparticles are dispersed therein. Ultrasonic dispersion 30 ~ 45min. spare.

[0035] Add 8.064g (0.056 mol) of D,L-lactide after three times of recrystallization from vinyl acetate to a 50ml dry round bottom flask, add 0.0126g (1.4×10 -4 mol) butanediol, 15μl stannous octoate (0.001mol / L). Polymerize for 24 hours at 130°C under nitrogen protection. After the reaction was completed, dichloromethane was added to dissolve, and then the product was dropped into iced n-hexane to precipitate and purify the product, and vacuum-dried to obtain a white flocculent polymer. The molecular weight is 50,000. Dissolve 1.28 g of the obtained white flocculent polymer in 2 ml of anhydrous toluene, and stir at 65° C. for 30 min. Add 0.024 g of 1,6-hexamethylene diisocyanate and 20 μl of chain extension cat...

Embodiment 3

[0037] Fe 3 o 4 The nanoparticle surface modification method is as in Example 1.

[0038] Put 22.5ml of anhydrous toluene in the sample bottle, and 0.09g of surface-modified Fe 3 o 4 Nanoparticles are dispersed therein. Ultrasonic dispersion 30 ~ 45min. spare.

[0039] Add 8.064g (0.056 mol) of D,L-lactide after three times of recrystallization from vinyl acetate to a 50ml dry round bottom flask, add 0.0126g (1.4×10 -4 mol) butanediol, 15μl stannous octoate (0.001mol / L). Polymerize for 24 hours at 130°C under nitrogen protection. After the reaction was completed, dichloromethane was added to dissolve, and then the product was dropped into iced n-hexane to precipitate and purify the product, and vacuum-dried to obtain a white flocculent polymer. The molecular weight is 50,000. Dissolve 1.28 g of the obtained white flocculent polymer in 2 ml of anhydrous toluene, and stir at 65° C. for 30 min. Add 0.024 g of 1,6-hexamethylene diisocyanate and 20 μl of chain extension c...

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Abstract

The invention relates to a method for preparing a magneto type biodegradable shape-memory composite material. According to the shape-memory composite material, isocyanate chain segments are taken as a hard phase, and poly-D,L-lactide and polytetramethylene ether glycol are taken as a soft phase. The method for preparing the shape-memory composite material comprises the steps: initiating the ring-opening polymerization of D,L-lactide with micromolecular glycol, so as to prepare poly-D,L-lactide of a certain molecular weight, of which the two terminals are provided with hydroxyl groups, and then, coupling to polytetramethylene ether glycol through diisocyanate, so as to form a straight-chain block copolymer; then, mixing with surface modified Fe3O4 nanoparticles, thereby preparing the magneto type biodegradable shape-memory composite material. The shape-memory composite material prepared by the method has the characteristics of strong deformation holding ability, high shape recovery rate, good shape memory performance and repeatability, biodegradation and the like; furthermore, the function of initiating shape memory in a non-contact manner is realized, and the material can have a targeting property due to the presence of the Fe3O4 nanoparticles.

Description

technical field [0001] The invention belongs to the field of medical biomaterials, and relates to a preparation method of a magnetic-induced biodegradable shape-memory polymer nanocomposite material. Background technique [0002] With the development of society, the trend of intelligence is becoming more and more obvious, and the development of intelligence has driven the development of smart materials. Shape memory material is a new type of intelligent material developed since the 1960s. It is widely used in daily life. From space shuttles in space to biomedicine in our lives, shape memory materials can be found . [0003] Shape memory material refers to the ability to sense changes in the external environment (current, magnetic field, heat, light, solvents, etc.) Revert to the pre-set shape. The first material to discover shape memory properties is shape memory alloy (Shape Memory Alloy, SMA), which is currently the most widely used shape memory material. Due to its ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/08C08K9/06C08K3/22C08G18/42C08G18/48C08G63/08
Inventor 顾书英高偰峰
Owner TONGJI UNIV
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