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Force-induced discoloration polyurethane elastomer material as well as preparation method and application thereof

A polyurethane elastomer and color-induced technology, which is applied in the field of mechanochemical conductive materials, can solve the problems of few mechanochromic materials and flexible substrates, the influence of mechanical properties and mechanochromic properties, poor mechanical properties, etc., and achieve rapid color change And reversible, excellent mechanochromic performance, sensitive mechanical force response effect

Active Publication Date: 2021-09-07
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The mechanochromic materials based on rhodamine groups in the prior art have poor mechanical properties and cannot be directly applied to products such as smart clothing that have high requirements for material flexibility.
Mechanochromic polyurethane elastomer materials can be obtained by compounding mechanochromic materials with flexible substrates, but different compounding methods may have unpredictable effects on the mechanical properties and mechanochromic properties of mechanochromic polyurethane elastomer materials
In the prior art, there are relatively few studies on functional materials composited with rhodamine-based mechanochromic materials and flexible substrates.

Method used

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  • Force-induced discoloration polyurethane elastomer material as well as preparation method and application thereof
  • Force-induced discoloration polyurethane elastomer material as well as preparation method and application thereof
  • Force-induced discoloration polyurethane elastomer material as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0046] The preparation method of trihydroxyrhodamine derivative:

[0047] The structure of the trihydroxyrhodamine derivative involved in the embodiments of the present invention is shown in formula (3):

[0048]

[0049] The preparation method of above-mentioned trihydroxyrhodamine derivative (referred to as compound 2) is as follows, and its synthetic route is:

[0050]

[0051] The preparation steps of trihydroxyrhodamine derivative (referred to as compound 2):

[0052] (1) Rhodamine 6G (Rhodamine 6G, 10g, 20.8mmol) was dissolved in 160mL of acetonitrile, ethanolamine (3.7mL, 62.6mmol) was added to the solution, the solution was refluxed for 24h and then cooled to room temperature, filtered to obtain a solid, washed with water, vacuum After drying, 9.1 g of off-white product was obtained, and the yield of compound 1 was 95%.

[0053](2) Compound 1 (4g, 8.7mmol) and sodium bicarbonate (9.6g, 69.8mmol) were added to 40mL bromoethanol, and heated at 100°C for 24h. Aft...

Embodiment 1

[0064] A method for a mechanochromic polyurethane elastomer material, using polytetrahydrofuran, isophorone diisocyanate, triethanolamine, and trihydroxyrhodamine derivatives as raw materials; figure 1 It is the synthetic route of the mechanochromic polyurethane elastomer PU-Rh of embodiment 1.

[0065] The method comprises the steps in turn:

[0066] Dissolve isophorone diisocyanate (IPDI, 3.508g, 15.8mmol) in acetone (PA), add dibutyltin dilaurate (DBTDL, 30μl) dropwise, heat to 60°C in a round bottom flask, nitrogen Reflux under the protection of the atmosphere, add a trihydroxyrhodamine derivative (0.067 g, 0.1 mmol) dissolved in acetone, and react for 6 hours. Add polytetrahydrofuran (PTMEG, 10g, 11.8mmol) dissolved in acetone and continue the reaction for 6 hours; then add triethanolamine (TEA, 0.399g, 2.7mmol), mix well and pour the product into a polytetrafluoroethylene mold, and wait for the solvent After natural volatilization, the mechanochromic polyurethane film ...

Embodiment 2

[0073] A method for mechanochromic polyurethane elastomer materials, using polytetrahydrofuran, isophorone diisocyanate, and triethanolamine, referring to Example 1, the only difference is that trihydroxyrhodamine derivatives are used as chain extenders to synthesize mechanochromic Color changing polyurethane PU-Rh-1.

[0074] The method comprises the steps in turn:

[0075] Polytetrahydrofuran (PTMEG, 10g, 11.8mmol) was dissolved in acetone (PA), dibutyltin dilaurate (DBTDL, 30μl) was added dropwise, heated to 70°C in a round-bottomed flask, and refluxed under a nitrogen atmosphere. Slowly add isophorone diisocyanate (IPDI, 3.508g, 15.8mmol) dropwise and react for 6 hours to generate a prepolymer. Add trihydroxyrhodamine derivatives (0.067g, 0.1mmol) dissolved in acetone and continue to react for 6 hours; then add triethanolamine (TEA, 0.399g, 2.7mmol), mix well and pour the product into a polytetrafluoroethylene mold , after the solvent volatilized naturally, the mechanoch...

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Abstract

The invention relates to a mechanochromic polyurethane elastomer material as well as a preparation method and application thereof, and belongs to the technical field of mechanochemical conduction materials. The mechanochromic polyurethane elastomer material provided by the invention contains a repeating unit with a specific structure. Tests show that the color of the mechanochromic polyurethane elastomer material is changed from colorless to red after being stressed, the color of polyurethane can be recovered to a colorless state before being stressed after the mechanochromic polyurethane elastomer material is stood at room temperature for 15 minutes, and the color change performance is not obviously reduced after the mechanochromic polyurethane elastomer material is repeatedly used for five times. Meanwhile, the material has good anti-interference performance, and the color change performance of the material cannot be affected by stimulation of ultraviolet rays, temperature and the like, so that the mechanochromic polyurethane material has good performance and is expected to be applied to the fields of intelligent clothing and the like.

Description

technical field [0001] The invention relates to a mechanochromic polyurethane elastomer material, its preparation method and application, and belongs to the technical field of mechanochemical conductive materials. Background technique [0002] Mechanochromic materials refer to functional materials whose optical properties can change when subjected to external forces. When the mechanochromic material is subjected to an external force, the color of the material changes, which can intuitively indicate information such as the magnitude of the force, the area under the force, and the location of the force. Such materials have broad application prospects in non-destructive testing, decoration, smart clothing, and sports. Therefore, it is of great significance to prepare high-performance mechanochromic polymers. The realization of the mechanochromic function usually relies on small molecular mechanochromic groups. There are two common ways to change the molecular color by force. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/48C08G18/66C08G18/32
CPCC08G18/10C08G18/6674C08G18/4854C08G18/48C08G18/3215
Inventor 孙昌陆宝泉王树根郝晨淇王令夏维宣王骞奕黄清欣
Owner JIANGNAN UNIV
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