Autonomous self-repairing elastomer with high tensile property as well as preparation method and application thereof

A tensile performance and self-repairing technology, which is applied in the measurement of the properties and forces of piezoelectric devices, can solve the problems of weak mechanical strength, long repair time, and low repair efficiency, and achieve high tensile performance and strong mechanical strength. Effect

Active Publication Date: 2020-06-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are still two types of problems for traditional self-healing materials: first, most self-healing materials need external energy (light, heat or pressure) to achieve healing, and the materials

Method used

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  • Autonomous self-repairing elastomer with high tensile property as well as preparation method and application thereof
  • Autonomous self-repairing elastomer with high tensile property as well as preparation method and application thereof
  • Autonomous self-repairing elastomer with high tensile property as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Put 4.6g of double-terminated hydroxyl polydimethylsiloxane (HO-PDMS-OH) in a dry container, stir at 100°C for 1 hour under vacuum to remove moisture, and then cool down to 70°C.

[0038] (2), 0.25g of isophorone diisocyanate (IPDI) and 0.02g of dibutyltin dilaurate (DBTDL) were dissolved in DMAC and added dropwise to the reaction vessel, and stirred at 70°C for 3 hours under nitrogen to synthesize the prepolymer things.

[0039] (3), 0.06g 4,4'-dithiodianiline and 0.14g 2,2'-bipyridine-4,4'-dicarboxylic acid were dissolved in DMAC and added dropwise to the prepolymer in the reaction vessel In, stirred at 70°C for 3 hours to obtain the reaction product.

[0040] (4) Pour the reacted product into a polytetrafluoroethylene mold, and vacuum-dry at 90° C. for 12 hours to obtain the elastomer P1.

[0041] (5) The molar ratio of silicone resin Psi to weak hydrogen bond compound IP, disulfide bond monomer SS, and strong hydrogen bond compound BNB is 4:8:1:3.

Embodiment 2

[0043] (1) Put 4.60 g of double-terminated hydroxyl polydimethylsiloxane (HO-PDMS-OH) in a dry container, stir at 100°C for 1 hour under vacuum to remove moisture, and then cool down to 70°C.

[0044] (2), 0.25g of isophorone diisocyanate (IPDI) and 0.02g of dibutyltin dilaurate (DBTDL) were dissolved in DMAC and added dropwise to the reaction vessel, and stirred at 70°C for 3 hours under nitrogen to synthesize the prepolymer things.

[0045] (3) Dissolve 0.12g of 4,4'-dithiodianiline and 0.10g of 2,2'-bipyridine-4,4'-dicarboxylic acid in DMAC and add dropwise to the prepolymer in the reaction vessel In, stirred at 70°C for 3 hours to obtain the reaction product.

[0046] (4) Pour the reacted product into a polytetrafluoroethylene mold, and vacuum-dry at 90° C. for 12 hours to obtain the elastomer P2.

[0047] (5) The molar ratio of silicone resin Psi to weak hydrogen bond compound IP, disulfide bond monomer SS, and strong hydrogen bond compound BNB is 2:4:1:1.

Embodiment 3

[0049] (1) Put 4.60 g of double-terminated hydroxyl polydimethylsiloxane (HO-PDMS-OH) in a dry container, stir at 100°C for 1 hour under vacuum to remove moisture, and then cool down to 70°C.

[0050] (2), 0.50g of isophorone diisocyanate (IPDI) and 0.02g of dibutyltin dilaurate (DBTDL) were dissolved in DMAC and added dropwise to the reaction vessel, and stirred at 70°C for 3 hours under nitrogen to synthesize prepolymer things.

[0051] (3) Dissolve 0.48g of 4,4'-dithiodianiline and 0.19g of 2,2'-bipyridine-4,4'-dicarboxylic acid in DMAC and add dropwise to the prepolymer in the reaction vessel In, stirred at 70°C for 3 hours to obtain the reaction product.

[0052] (4) Pour the reacted product into a polytetrafluoroethylene mold, and vacuum dry at 90° C. for 12 hours to obtain the elastomer P3.

[0053] (5) The molar ratio of silicone resin PSi to weak hydrogen bond compound IP, disulfide bond monomer SS, and strong hydrogen bond compound BNB is 1:4:2:1.

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Abstract

The invention belongs to the technical field of functional materials, and particularly relates to an autonomous self-repairing elastomer with high tensile property as well as a preparation method andapplication thereof. The self-repairing elastomer with high tensile property is a product obtained by chemically crosslinking organic silicon resin PSi, a disulfide bond monomer SS, a weak hydrogen bond compound IP and a strong hydrogen bond compound BNS. A dynamic supramolecular polymer network is spontaneously formed in an organic silicon resin polymer main chain, an elastomer has high strengthand high elasticity due to strong cross-linked H bonds, and strain energy is dissipated by weak H bonds through effective reversible bond breakage and reforming; and the disulfide bond is helpful forimproving the self-repairing performance of the elastomer. The dynamically built synergistic effects impart ultra-high stretchability (approximately 14,000%) to the elastomer as well as rapid autonomous self-healing capabilities underwater, in refrigerated (4 DEG C) freezing temperatures (-20 DEG C) or in supercooled seawater (30% NaCl solution at the temperature of -10 DEG C or less).

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to an autonomous self-repairing elastic body with high tensile properties and its preparation method and application. Background technique [0002] Natural tissues, such as skin and muscle, have the ability to spontaneously heal damage and sustain the survival of most animals. In recent years, a large number of researchers are actively researching and developing synthetic materials that can mimic the self-healing properties of natural tissues for use in fields such as electronic skin, wearable electronic devices, and artificial muscles, so as to significantly improve the service life, robustness, and safety of materials. [0003] However, there are still two types of problems for traditional self-healing materials: first, most self-healing materials need external energy (light, heat or pressure) to achieve healing, and the materials after self-healing show w...

Claims

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Application Information

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IPC IPC(8): C08G18/10C08G18/61C08G18/32C08G18/34G01L1/16
CPCC08G18/10C08G18/61G01L1/16C08G18/3855C08G18/3844
Inventor 张雷杨静郭洪爽田澍
Owner TIANJIN UNIV
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