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Autonomous self-healing elastomer with high tensile properties and its preparation method and application

A tensile performance and self-healing technology, applied in the measurement of the property force of piezoelectric devices, etc., can solve the problems of weak mechanical strength, long repair time, low repair efficiency, etc., and achieve strong mechanical strength and high tensile performance. Effect

Active Publication Date: 2022-04-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 after self-healing show weak mechanical strength ; The second traditional self-healing material can only satisfy self-healing at room temperature and the repair time is longer, and the repair efficiency is lower

Method used

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  • Autonomous self-healing elastomer with high tensile properties and its preparation method and application
  • Autonomous self-healing elastomer with high tensile properties and its preparation method and application
  • Autonomous self-healing elastomer with high tensile properties and its preparation method and application

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 thing.

[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 the prepolymer thing.

[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 in particular relates to an autonomous self-repairing elastic body with high tensile properties and its preparation method and application. The autonomous self-healing elastomer with high tensile properties is a chemically cross-linked product of silicone resin PSi, disulfide bond monomer SS, weak hydrogen bond compound IP, and strong hydrogen bond compound BNS. The invention spontaneously forms a dynamic supramolecular polymer network in the main chain of the silicone resin polymer, the strong cross-linked H bonds make the elastomer have high strength and high elasticity, and the weak H bonds are consumed by effective reversible bond breaking and reforming Dissipated strain energy; and disulfide bonds help to improve the self-healing properties of elastomers. The synergistic effect of these dynamics endows the elastomer with ultrahigh stretchability (≈14000%) and excellent resistance to underwater, refrigerated (4°C) freezing temperature (‑20°C) or supercooled seawater (30% NaCl below ‑10°C). solution) have rapid self-healing ability.

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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Patent Type & Authority Patents(China)
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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