Self-repairing gutta-percha shape memory elastomer as well as preparation method and application thereof

A technology of eucommia gum and elastomer is applied in the field of shape memory material preparation to achieve the effect of simple preparation method and excellent self-healing performance

Pending Publication Date: 2021-12-14
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the obtained eucommia gum shape memory elastomer does not need to add fillers for reinforcement during the preparation process, and the preparation process is simpler and more efficient; at the same time, this method is of great significance for reducing the consumption of rubber resources and improving the environmental pollution of waste rubber

Method used

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  • Self-repairing gutta-percha shape memory elastomer as well as preparation method and application thereof
  • Self-repairing gutta-percha shape memory elastomer as well as preparation method and application thereof
  • Self-repairing gutta-percha shape memory elastomer as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment provides a method for preparing a self-reinforcing, self-repairing, and recyclable Eucommia gum shape-memory elastomer, including:

[0048] (1) Dissolving 10 g of Eucommia gum in the organic solvent toluene to make a 3% solution, adding 18 mmol of acetic acid and 27 mmol of hydrogen peroxide, reacting at 30° C. for 6 h, and obtaining the product A modified Eucommia gum through precipitation, washing and drying;

[0049] (2) 10g modified Eucommia gum, 1g Eucommia gum, 0.1g oxalic acid, 0.2g tetrabutylammonium chloride, 0.2g zinc nitrate are dissolved in toluene, fully mixed;

[0050] Precipitate with organic solvent ethanol, wash, dry, and finally vulcanize at 180°C and 15MPa for 20 minutes to obtain the shape memory elastomer of Eucommia gum.

[0051] Such as figure 1 As shown, compared with product A modified Eucommia gum, the final product Eucommia gum shape memory elastomer obtained after vulcanization is 1723cm -1 (C=O stretching vibration) and 349...

Embodiment 2

[0053] This embodiment provides a method for preparing a self-reinforcing, self-repairing, and recyclable Eucommia gum shape-memory elastomer, including:

[0054] (1) Dissolve 10 g of eucommia gum in organic solvent xylene to make a 5% solution, add 10 mmol of formic acid and 30 mmol of peracetic acid, react at 40° C. for 5 hours, precipitate, wash, and dry to obtain the product A modified eucommia glue;

[0055] (2) 10g product A modified eucommia gum, 3g eucommia gum, 0.15g glutaric acid, 0.25g imidazole, 0.1g zinc sulfate are dissolved in xylene, fully mixed;

[0056] Precipitate with organic solvent ethanol, wash, dry, and finally vulcanize at 170°C and 15MPa for 30 minutes to obtain the shape memory elastomer of Eucommia gum.

[0057] Such as figure 2 As shown, use a razor blade to make a scratch on the surface of the sample, such as figure 2 As shown in (a); and the sample was placed in a 120°C oven for 30 minutes of self-repair, and the scratches basically disappea...

Embodiment 3

[0059] This embodiment provides a method for preparing a self-reinforcing, self-repairing, and recyclable Eucommia gum shape-memory elastomer, including:

[0060] (1) Dissolve 10 g of eucommia gum in the organic solvent chloroform to make a 2% solution, add 10 mmol of benzoic acid and 35 mmol of hydrogen peroxide, react at 50 ° C for 4 hours, and obtain the product A modified eucommia by precipitation, washing and drying glue;

[0061] (2) Dissolve 10 g of product A modified eucommia gum, 0.5 g of eucommia gum, 0.05 g of ethylenediamine, 0.05 oxalic acid, 0.1 g of tetrabutylammonium chloride, and 0.1 g of zinc sulfate in chloroform, and mix thoroughly;

[0062] Precipitate with organic solvent methanol, wash, dry, and finally vulcanize at 180°C and 10MPa for 25 minutes to obtain the shape memory elastomer of Eucommia gum.

[0063] Such as image 3 As shown in (a), cut the prepared original sample Eucommia gum shape memory elastomer into pieces, as shown in the left figure, a...

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Abstract

The invention relates to the technical field of preparation of shape memory materials, in particular to a self-reinforcing, self-repairing and recyclable gutta-percha shape memory elastomer as well as a preparation method and application thereof. The gutta-percha shape memory elastomer provided by the invention has a semi-interpenetrating dynamic network structure; and the semi-interpenetrating dynamic network structure is composed of a dynamic covalent bond cross-linked network and linear gutta-percha crystals. Epoxy or hydroxyl groups are introduced to a gutta-percha molecular chain to prepare modified gutta-percha, then the modified gutta-percha and conventional unmodified gutta-percha are blended, and a semi-interpenetrating dynamic network structure is formed under the action of a cross-linking agent and a catalyst. The self-reinforcement of the material is realized by utilizing the non-crosslinked linear gutta-percha crystal in the semi-interpenetrating dynamic network, and the shape memory function of the material is realized; and meanwhile, through a dynamic covalent bond cross-linked network, the material has high elasticity, self-repairing performance, topological structure reconstruction performance and repeated processing performance.

Description

technical field [0001] The invention relates to the technical field of preparation of shape memory materials, in particular to a self-reinforcing, self-repairing, recyclable Eucommia gum shape memory elastomer, a preparation method and application thereof. Background technique [0002] Eucommia ulmoides is a rare and valuable economic tree species unique to China, and it is also an important collagen plant with the widest application range in the world. The leaves, bark and peel of Eucommia are rich in a white filamentous substance - Eucommia gum. [0003] Eucommia gum is an isomer of natural rubber, and its structure is trans-polyisoprene, which is a special bio-based polymer material. Eucommia gum behaves as a hard plastic at room temperature, but its molecular chain is flexible and has dual properties of rubber and plastic. By cross-linking Eucommia gum in different degrees, it can be prepared as shape memory material and elastomer material. In addition, eucommia gum c...

Claims

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Application Information

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IPC IPC(8): C08L15/00C08L7/00C08K5/092C08K5/17C08K5/375C08J3/24
CPCC08L15/00C08J3/246C08L2201/12C08L2205/04C08J2315/00C08J2407/00C08L7/00C08K5/092C08K5/17C08K5/375
Inventor 岳冬梅祁鑫张立群张继川
Owner BEIJING UNIV OF CHEM TECH
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