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Preparation method of self-repair type shape memory polyurethane containing diselenide bond

A technology of polyurethane and self-healing, which is applied in the field of preparation of self-healing shape memory polyurethane, which can solve the problems of no self-healing function and no related reports of memory polyurethane, and achieve the effect of good molecular structure designability

Inactive Publication Date: 2018-04-17
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Chinese patent (CN105802196A) discloses a polymer material with two-way shape memory effect and its preparation method, which is composed of crystalline polyether or polyester diol, diisocyanate, small molecule chain extender, rubber elastomer, Composed of free radical polymerization UV photoinitiator and polythiol curing agent, it can realize shape memory function at 60 °C, but the shape memory process still needs UV curing, and it does not have self-repair function, so there are certain limitations
As far as we know, there are no related reports on self-healing shape memory polyurethanes containing diselenium bonds

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: 30 g polybutylene adipate (M n = 3000) was placed in a three-necked flask equipped with a stirrer, a thermometer and a condensing device, at 110 °C and a vacuum of 0.09 MPa, dewatering and cooling were carried out under reduced pressure; 5.22 g of toluene were added to the three-necked flask in sequence. Diisocyanate, 60 mL acetone, 15 μL organic bismuth catalyst 8108, nitrogen protection, heated to 70 °C under mechanical stirring for 3 h; then added 3.49 g diselenodiol, and reacted at 55 °C for 5 h, until isocyanide The acid radical content reached the theoretical value (determined by di-n-butylamine titration method); cooled to room temperature, poured the film, and dried at 25-50 ℃ for 48 h to obtain a self-healing shape memory polyurethane containing diselenide bond.

Embodiment 2

[0023] Embodiment two: 30 g polycaprolactone (M n = 3000) was placed in a three-necked flask equipped with a stirrer, a thermometer and a condensing device, at 110 °C and a vacuum of 0.09 MPa, dewatering and cooling were carried out under reduced pressure; 5.22 g of toluene were added to the three-necked flask in sequence. Diisocyanate, 60 mL acetone, 15 μL organic bismuth catalyst 8108, nitrogen protection, heated to 70 °C under mechanical stirring for 3 h; then added 3.49 g diselenodiol, and reacted at 55 °C for 5 h, until isocyanide The acid radical content reached the theoretical value (determined by di-n-butylamine titration method); cooled to room temperature, poured the film, and dried at 25-50 ℃ for 48 h to obtain a self-healing shape memory polyurethane containing diselenide bond.

Embodiment 3

[0024] Embodiment three: 30 g polyethylene adipate (M n = 2000) was placed in a three-necked flask equipped with a stirrer, a thermometer and a condensing device, depressurized and dehydrated under the conditions of 110 °C and a vacuum of 0.09 MPa, and cooled; Phorone diisocyanate, 50 mL of acetone, 15 μL of organic bismuth catalyst 8108, nitrogen protection, heated to 80 °C under mechanical stirring for 3 h; then added 7.44 g diselenodiol, reacted at 60 °C for 4 h, Until the isocyanate content reaches the theoretical value (determined by the di-n-butylamine titration method); cool to room temperature, pour the film, and dry at 25-50 °C for 48 h to obtain a self-healing shape memory polyurethane containing diselenide bonds.

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Abstract

The invention discloses a preparation method of self-repair type shape memory polyurethane containing a diselenide bond. The polyurethane is obtained by performing pre-polymerization on diisocyanate and polyester diol and then performing block polymerization with diselenide diol. The polyurethane can realize a shape memory function under a relatively mild condition (30-60 DEG C) on the basis of the crystallization reversibility of a polyester molecular chain and the dynamic exchange characteristic of the diselenide bond, and simultaneously can realize repair of cut cross sections of materials,scratches and other damages. The synthesized polyurethane is of a multi-block structure, takes crystalline polyester diol as a soft segment, takes diisocyanate and diselenide diol containing dynamiccovalent bonds as a hard segment, and has good molecular structure designability; and by adjusting the components and proportions of the soft segment and the hard segment, self-repair and shape memoryfunctions of the polyurethane can be effectively adjusted. The polyurethane can be applied to the fields of intelligent packaging, electronic devices, biomedical materials and the like.

Description

technical field [0001] The invention relates to a preparation method of a self-healing shape memory polyurethane, in particular to the preparation of a self-repairing shape memory polyurethane containing a diselenide dynamic covalent bond Background technique [0002] With the development of science and technology, various new materials emerge as the times require, and smart materials are one of them. The so-called smart materials are a class of materials with a series of specific functions such as self-diagnosis, self-adaptation, and self-repair. As one of the typical representatives of smart materials, shape memory polyurethane is a polymer with an initial shape that can be restored to its original shape through external stimuli such as heat, light, electricity, and magnetism after being deformed and fixed under certain external conditions. (Progress in Polymer Science, 2010, 35(1-2):3-23.). [0003] At present, thermo-induced shape memory polymers, which use temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/32
CPCC08G18/3897C08G18/4238C08G18/4277C08G18/6633C08G2280/00
Inventor 金勇杜卫宁潘界舟
Owner SICHUAN UNIV
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