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Preparation method for dual-reversible-key self-healing silicone rubber capacitive pressure sensor at room temperature

A technology of pressure sensor and silicone rubber, which is applied in the direction of instruments, measuring force, measuring devices, etc., can solve the problems of restricting the development of silicone rubber and unsatisfactory comprehensive properties, achieve excellent self-healing ability, and improve self-healing efficiency at room temperature , the effect of short production cycle

Active Publication Date: 2019-05-17
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most self-healing materials achieve self-healing by introducing reversible dynamic bonds between polymer backbones, such as hydrogen bonds, metal coordination bonds, reversible covalent bonds, etc., but the comprehensive properties are still unsatisfactory. Greatly hampered the development of silicone rubber

Method used

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  • Preparation method for dual-reversible-key self-healing silicone rubber capacitive pressure sensor at room temperature
  • Preparation method for dual-reversible-key self-healing silicone rubber capacitive pressure sensor at room temperature
  • Preparation method for dual-reversible-key self-healing silicone rubber capacitive pressure sensor at room temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Get 0.37g isophorone diisocyanate (IP) to be dissolved in 5mL chlorobenzene solvent and obtain IP solution, get the poly(dimethylsiloxane) (dimethylsiloxane) (H 2 N-PDMS-NH 2 ) and 0.15g of terephthalaldehyde (TPA) were dissolved in 20mL of chlorobenzene to obtain a mixed solution, and the mixed solution was placed at 60°C and stirred thoroughly. middle. After reacting at 60°C for 3 hours, pour the mixed solution into a polytetrafluoroethylene mold with a length of 5cm, a width of 5cm, and a depth of 0.5cm, and dry it at 80°C for 2 days. After drying, the thickness is about 1.5mm, and the molar ratio is 2: 3:5 PDMS-1 self-healing silicone rubber film.

Embodiment 2

[0033]Change Example 1 to take by weighing 0.493g isophorone diisocyanate (IP) and dissolve it in 5mL of chlorobenzene solvent to obtain an IP solution, and take by weighing 5g of bis(3-aminopropyl)-terminated poly(dimethylsiloxane) alkane) (H 2 N-PDMS-NH 2 ) and 0.074g terephthalaldehyde (TPA) are dissolved in the chlorobenzene of 20mL to obtain mixed solution, all the other steps are identical with embodiment 1. A PDMS-2 self-healing silicone rubber film with a molar ratio of each component of 1:4:5 was obtained.

Embodiment 3

[0035] Take by weighing 0.616g isophorone diisocyanate (IP) and be dissolved in 10mL chlorobenzene solvent and obtain IP solution, take by weighing the poly(dimethylsiloxane) (dimethylsiloxane) (H 2 N-PDMS-NH 2 ) was dissolved in 15mL chlorobenzene to obtain H 2 N-PDMS-NH 2 Solution, slowly drop IP solution into H under stirring condition 2 N-PDMS-NH 2 Solution, then heated to 60°C for 3 hours, the mixed solution was poured into a polytetrafluoroethylene mold with a length of 5cm, a width of 5cm, and a depth of 0.5cm, and dried at 80°C for 2 days. After drying, the thickness was about 1.5mm, IP: H 2 N-PDMS-NH 2 PDMS-3 self-healing silicone rubber film with a molar ratio of 1:1.

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Abstract

The invention belongs to the technical field of new materials and sensors, and discloses a preparation method for dual-reversible-key self-healing silicone rubber capacitive pressure sensor at room temperature. Terephthalaldehyde, isoflurone diisocyanate and bis(3-aminopropyl)-terminated poly(dimethylsiloxane) are used as materials to perform a polycondensation reaction, so that silicone rubber, with a dual-reversible-key polydimethylsiloxane cross-linked network structure, which is provided with an imine bond on the main chain and adopts a ureido hydrogen bond as a crosslinking point is formed. The generated silicone rubber has good transparency, high stretchability and rapid self-healing performance at the room temperature. The silicone rubber is combined with the carbon nanotube thin film to manufacture the capacitive pressure sensor of a sandwich structure in which the conductive layers at two ends are made from carbon nanotube thin film and the intermediate dielectric layer is made from the seal-healing silicone rubber. The preparation method provided by the invention is simple, wide in material range, and good in electrochemical performance and mechanical performance, and hasthe wide application prospect in the field of flexible wearable materials.

Description

technical field [0001] The invention belongs to the technical field of new materials and sensors, and in particular relates to a preparation method of a double reversible bond room temperature self-healing silicone rubber capacitive pressure sensor. Background technique [0002] Silicone-based elastomers have excellent properties due to their unique structures and the characteristics of Si-O-Si bonds. However, due to the irreversible covalently crosslinked network, traditional polysiloxane elastomers cannot repair damage and cannot be recycled. In order to enable polysiloxane materials to be used in harsh environments for a long time and to self-repair when damaged or broken, a lot of research has been invested in the development of self-healing polysiloxane elastomers. Most self-healing materials achieve self-healing by introducing reversible dynamic bonds between polymer backbones, such as hydrogen bonds, metal coordination bonds, reversible covalent bonds, etc., but the ...

Claims

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Application Information

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IPC IPC(8): G01L1/14
Inventor 袁宁一严昊丁建宁戴胜平程广贵
Owner CHANGZHOU UNIV