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Preparation method of high-strength self-repairing material based on siloxane bonds

A self-healing material and siloxane bond technology, applied in the field of materials, can solve the problems of self-healing super glue with complex structure, harsh reaction conditions, and complicated preparation methods, and achieve simple and mild repair conditions, simple reaction, and avoid reaction routes. Effect

Active Publication Date: 2020-05-08
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] High-strength self-healing materials have broad application prospects in medical materials, aerospace, coatings and other fields. Chinese patent CN108503782A discloses a method for preparing high-strength self-healing polyurethane elastomers. The preparation method is complicated and the reaction conditions are harsh.
Chinese patent CN105802576A discloses a self-repairing superglue and a preparation method thereof. The self-repairing superglue has excellent physical and mechanical properties and self-repairing performance, but this self-repairing superglue has a complex structure and high cost

Method used

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  • Preparation method of high-strength self-repairing material based on siloxane bonds
  • Preparation method of high-strength self-repairing material based on siloxane bonds
  • Preparation method of high-strength self-repairing material based on siloxane bonds

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Effect test

Embodiment 1

[0032] The siloxane bond-containing unsaturated monomer (where R 1 , R 2 , R 3 Both are methyl, and Y is the structure shown in formula II) prepared according to the method described in the prior art (Edward N.T., et al., Nucleic Acids Research[J], 1996, 24(16):3142-3148.) of.

[0033] Dissolve 9.6397 g of unsaturated monomers containing siloxane bonds in 300 mL of tetrahydrofuran, add 0.1918 g of azobisisobutyronitrile, and react at 70°C for 24 hours. After natural cooling, the solvent is distilled off under reduced pressure. Precipitate polymer P (AamKH550) with 200 mL of n-hexane, then dissolve the polymer in tetrahydrofuran, add dropwise to 10 wt.% polyvinyl alcohol (molecular weight is 70000 g / mol, mass is 19.2794 g) aqueous solution, at 60 °C The reaction was carried out for 20 minutes, and after the reaction was completed, the self-healing material P(AamKH550) / PVA was obtained by vacuum drying at 60° C. for 12 hours.

[0034] The siloxane bond-containing unsaturated...

Embodiment 2

[0038] The siloxane bond-containing unsaturated monomer (where R 1 is methyl, R 2 , R 3 Both are ethyl, and Y is the structure shown in formula III) prepared according to the method described in the prior art (Edward N.T., et al., Nucleic Acids Research[J], 1996,24(16):3142-3148.) of.

[0039] Dissolve 8.2626g of unsaturated monomers containing siloxane bonds in 250mL of tetrahydrofuran, add 0.1653g of dimethyl azobisisobutyrate at 100°C for 24 hours, cool naturally, and distill off the solvent under reduced pressure. Precipitate polymer P (AamKH550) with 200 mL of n-hexane, then dissolve the polymer in tetrahydrofuran, add dropwise to 30 wt.% polyvinyl alcohol (molecular weight 130000 g / mol, mass 4.1313 g) aqueous solution, at 80 ° C After reacting for 1 h, after the reaction, vacuum drying at 80° C. for 24 h to obtain the self-healing material P(AamKH550) / PVA.

[0040] The siloxane bond-containing unsaturated monomer in the present embodiment is detected by proton nuclea...

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Abstract

The invention discloses a preparation method of a high-strength self-repairing material based on siloxane bonds, which comprises the following steps: adding an initiator into an unsaturated monomer containing siloxane bonds to polymerize, heating the obtained polymer solution and polyvinyl alcohol to sufficiently react, and drying to obtain the high-strength self-repairing material containing siloxane bonds. Unsaturated olefin and a silane coupling agent are adopted to react to obtain a monomer, a conventional free radical initiator is selected to initiate polymerization, then a polymer and polyvinyl alcohol are heated and mixed for reaction, reaction raw materials are cheap and easy to obtain, and reaction conditions are mild. The use of complex reaction routes and high-cost raw materialsis avoided. The reaction yield of each step is high, the reaction is simple and feasible, and the product is easy to separate. The prepared self-repairing material is excellent in mechanical property, and the repairing condition is simple and mild.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of a high-strength self-healing material based on siloxane exchange. Background technique [0002] Self-healing materials can automatically detect damage and achieve automatic healing after being damaged, which can reduce the occurrence of safety accidents caused by material cracks in the engineering field. Environmental pollution problems caused by material failure and recycling difficulties. The excellent mechanical properties of high-strength polymer materials largely depend on the entanglement and cross-linking between polymer segments. When the material is damaged, it is difficult to realize the rapid migration of molecular chains in a short time due to the polymer segments. And winding, to realize the reuse of materials can only be reshaped by heating and melting the material, so it is difficult to balance self-healing performance and exc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C08F130/08
CPCC08G81/021C08F130/08
Inventor 纪红兵樊平薛灿周贤太熊超何耀荣徐德靖
Owner SUN YAT SEN UNIV