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Preparation method of polyphosphazene self-repairing elastomer

A self-healing and elastic body technology, which is applied in the field of preparation of polyphosphazene self-healing elastomers, can solve problems such as poor self-healing ability, low mechanical strength, and difficulty in balancing mechanical properties and self-healing ability, and achieve high self-healing ability and efficiency, high tensile strength and elongation at break

Active Publication Date: 2021-09-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polyphosphazene self-healing materials prepared by the above method generally have the following deficiencies: it is difficult to balance the mechanical properties and self-healing ability of polyphosphazene materials, and the self-healing ability is good, and the mechanical strength is often low; the mechanical strength is high, and the self-healing ability is often Difference

Method used

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  • Preparation method of polyphosphazene self-repairing elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0016] Take 35g of self-made polydichlorophosphazene, 0.06mol of sodium butylparaben, 0.1mol of sodium butoxide, and 0.44mol of sodium trifluoroethoxide, put them in a 1000ml three-necked flask, and react at 60°C for 12 hours. After the reaction is over, distill the reaction liquid to concentrate to about 1 / 3 volume, pour 700ml of 0.1mol / L NaOH solution into it and stir thoroughly, adjust the pH value to 9, add dilute hydrochloric acid to adjust the pH value to 6 after reacting for 1 hour, stop after continuing the reaction for 1 hour Reaction, static stratification. Take the oily liquid in the upper layer, pour it into n-heptane for precipitation, and dry it for 24 hours to obtain a yellow-brown carboxy-butoxy-trifluoroethoxy polyphosphazene.

[0017] Take 0.004 mol of 4,4-diaminodiphenyl disulfide and 0.009 mol of p-phenylene diisocyanate in dichloromethane under nitrogen protection at 40°C for 24 hours, pour n-heptane to precipitate the product, and obtain isocyanate with d...

Embodiment example 2

[0020] Using tetrahydrofuran as a solvent, take 35g of homemade polydichlorophosphazene, 0.06mol of sodium butylparaben, 0.24mol of sodium butoxide, and 0.30mol of sodium trifluoroethoxide, and put them in a 1000ml three-necked flask, and react at 60°C for 6 Hour. After the reaction is over, distill the reaction liquid to concentrate to about 1 / 3 volume, pour 700ml of 0.1mol / L NaOH solution into it and stir well, adjust the pH value to 10, add dilute hydrochloric acid to adjust the pH value to 5 after reacting for 1 hour, stop after continuing the reaction for 1 hour Reaction, static stratification. Take the oily liquid in the upper layer, pour it into n-heptane for precipitation, and dry it for 24 hours to obtain a yellow-brown carboxy-butoxy-trifluoroethoxy polyphosphazene.

[0021] Take 0.004 mol of 4,4-diaminodiphenyl disulfide and 0.009 mol of isophorone diisocyanate in tetrahydrofuran under nitrogen protection at 40°C for 24 hours, pour into n-heptane to precipitate the...

Embodiment example 3

[0024] Using tetrahydrofuran as a solvent, take 35g of homemade polydichlorophosphazene, 0.06mol of sodium butylparaben, 0.52mol of sodium butoxide, and 0.02mol of sodium trifluoroethoxide, put them in a 1000ml three-necked flask, and react at 60°C for 24 hours . After the reaction is over, distill the reaction liquid to concentrate to about 1 / 3 volume, pour 700ml of 0.1mol / L NaOH solution into it and stir well, adjust the pH value to 8, add dilute hydrochloric acid to adjust the pH value to 6 after reacting for 1 hour, stop after continuing the reaction for 1 hour Reaction, static stratification. Take the oily liquid in the upper layer, pour it into n-heptane for precipitation, and dry it for 24 hours to obtain a yellow-brown carboxy-butoxy-trifluoroethoxy polyphosphazene.

[0025] Take 0.004 mol of 4,4-diaminodiphenyl disulfide and 0.009 mol of hexamethylene diisocyanate in dichloromethane under nitrogen protection at 40°C for 24 hours, pour into n-heptane to precipitate th...

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Abstract

The invention discloses a preparation method of a polyphosphazene self-repairing elastomer. The preparation method comprises the following steps: reacting self-made polydichlorophosphazene with nucleophilic reagents such as sodium butyl paraben, sodium butoxide, sodium trifluoroethoxy and the like, and synthesizing carboxyl-butoxy-trifluoroethoxy polyphosphazene through alkaline hydrolysis and acidification; and cross-linking with a certain proportion of multivalent metal salt and an isocyanate prepolymer containing disulfide bonds, and introducing three dynamic bonds with different strengths to prepare the polyphosphazene self-repairing elastomer. According to the invention, in the butoxy-trifluoroethoxy polyphosphazene self-repairing elastomer, the disulfide bond and the coordination bond endow the elastomer with higher strength, and the hydrogen bond serving as a sacrificial bond endows the elastomer with higher toughness, so that the elastomer has higher tensile strength and elongation at break; and the dynamic bonds have high reversibility, so that the polyphosphazene is endowed with relatively strong self-repairing performance, the service life of the polyphosphazene material can be effectively prolonged, and the self-repairing polyphosphazene elastomer has thermoplasticity, can be recycled and is environment-friendly.

Description

Technical field: [0001] The invention discloses a preparation method of a polyphosphazene self-repairing elastomer containing aromatic dynamic disulfide bonds, metal coordination bonds and hydrogen bonds. Background technique: [0002] Self-healing materials are a new class of smart materials that have emerged since the 21st century, which can repair damage caused by mechanical use, thereby prolonging life. The polyphosphazene derivatives with different side group structures and various properties were prepared by substituting the chlorine of polydichlorophosphazene by nucleophilic substitution. The reports on the preparation of polyphosphazene self-healing elastomers by utilizing the flexibility of polyphosphazenes mainly focus on the introduction of dynamic reversible bonds into polyphosphazenes. For example, Zhang Aiqing from South Central University for Nationalities introduced ethyl 4-aminocinnamate into polyphosphazenes A self-healing polyphosphazene material was prep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/32C08G18/10C08G18/64C08G79/025
CPCC08G18/3857C08G18/10C08G18/6461C08G79/025C08G18/64
Inventor 王秀芬吴兆麟赵媛西马晨曦张燕萍
Owner BEIJING UNIV OF CHEM TECH