A kind of stretch color-changing polyurethane elastomer material and preparation method thereof

A polyurethane elastomer and prepolymer technology, which is applied in the field of mechanochemical conductive materials, can solve the problem of lack of optional materials for mechanically responsive color-changing molecules and mechanically responsive discoloration, and achieve the effects of simple and controllable preparation method and sensitive mechanical force response.

Active Publication Date: 2019-05-03
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Through different degrees of molecular design and modification of hexaarylbiimidazole, the polyurethane elastomer material designed based on it will show different color changes under stress, thus providing a new mechanical response. Color-changing molecules and mechanically responsive color-changing materials using them as color-changing units solve the technical problem of lack of mechanically responsive color-changing molecules and mechanically responsive color-changing materials in the prior art

Method used

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  • A kind of stretch color-changing polyurethane elastomer material and preparation method thereof
  • A kind of stretch color-changing polyurethane elastomer material and preparation method thereof
  • A kind of stretch color-changing polyurethane elastomer material and preparation method thereof

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preparation example Construction

[0045] The invention provides a preparation method of a stretchable color-changing polyurethane elastomer material, which is prepared from raw materials comprising the following components: oligomer diol, diisocyanate and hexaarylbiimidazole molecules, the hexaaryl Biimidazole molecules are a series of molecular switches with hydroxyl functional groups modified and designed with hexaarylbiimidazole as the main body of the molecule. Hexaarylbiimidazole has the structure shown in the following formula (2):

[0046]

[0047] As a preferred scheme wherein, the hexaarylbiimidazole molecules can have a structure as shown in any one of formula (three) to formula (eight):

[0048]

[0049] R in formula (three) to formula (eight) contains an alkyl group with 1 or 2 hydroxyl groups, preferably -(CH 2 ) 2 OH or -CH 2 CHOHCH 2 Oh. It should be pointed out that there are many kinds of R with a single and two hydroxyl groups, and only two of the most representative ones are listed...

Embodiment 1

[0065] Using PTMG as oligomer diol, MDI and HDI as diisocyanate, and 2,2'-diethanol alkoxyhexaarylbiimidazole molecules as raw materials to synthesize hexaarylbiimidazole block polyurethane elastomer stretching and discoloration Material. The molecular structure of 2,2'-diethanol alkoxyhexaarylbiimidazole is as follows.

[0066]

[0067] figure 1 It is a synthetic route diagram of the polyurethane elastomer stretching color-changing material synthesized from hexaaryl biimidazole blocks by using 2,2'-diethanol alkoxy hexaaryl biimidazole molecules as raw materials in Example 1. figure 2 It is the NMR spectrum of the 2,2'-diethanol alkoxyhexaarylbiimidazole molecule in Example 1. The 2,2'-diethanol alkoxyhexaarylbiimidazole molecule is synthesized through a three-step reaction. The first step is to react salicylaldehyde with dibromoethanol to obtain 2-diethanol alkoxybenzaldehyde; In the second step, 2-diethanolalkoxybenzaldehyde reacts with benzil to generate 2-diethanol...

Embodiment 2

[0073] Using PTMG as oligomer diol, MDI and HDI as diisocyanate, and 4,4'-diethanol alkoxyhexaarylbiimidazole molecules as raw materials to synthesize hexaarylbiimidazole block polyurethane elastomer Extensochromic material. The molecular structure of 4,4'-diethanol alkoxyhexaarylbiimidazole is as follows.

[0074]

[0075] image 3 It is the NMR spectrum of the 4,4'-diethanol alkoxyhexaarylbiimidazole molecule in Example 2. The 4,4'-diethanol alkoxyhexaarylbiimidazole molecule is synthesized through a three-step reaction. The first step is to react p-hydroxybenzaldehyde with dibromoethanol to obtain 4-diethanol alkoxybenzaldehyde; In the second step, 4-diethanolalkoxybenzaldehyde reacts with benzil to generate 4-diethanolalkoxytriphenylimidazole; in the third step, oxidizes 4-diethanolalkoxytriphenylimidazole to generate 4,4'-diethanolalkoxyhexaarylbiimidazole molecule.

[0076]Weigh 4,4'-diethanol alkoxyhexaarylbiimidazole molecule (9mg, 0.0125mmol), put it into a rou...

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Abstract

The invention belongs to the technical field of mechanical chemical conduction materials, and particularly relates to a stretching color change polyurethane elastomer material and a preparation methodthereof. The stretching color change polyurethane elastomer material with hexaarylimidazole as a color change unit is prepared from oligomer, namely dihydric alcohol, diisocyanate and hexaarylimidazole molecules as raw materials. The polyurethane elastomer is sensitive to mechanical force response, and the color change degree of the material is in a direct proportion to a stress, that is, the larger the stress is, the more conspicuous the color change is. The polyurethane elastomer material provided by the invention is of a linear structure, the main chain has hexaarylimidazole, the stress can be conducted to the hexaarylimidazole along the main chain when the polyurethane material is strained under the action of the stress, ultimately the C-B band between two imidazole rings of the hexaarylimidazole can be broken, then triphenyl imidazole free radicals of which the color is different from that of the hexaarylimidazole are formed, the stress is vanished, then the polyurethane materialis recovered to an initiator colorless state, and the process is reversible.

Description

technical field [0001] The invention belongs to the technical field of mechanochemical conductive materials, and in particular relates to a stretchable color-changing polyurethane elastomer material and a preparation method thereof. Background technique [0002] Stretch-chromic polyurethane elastomer materials belong to the category of mechano-responsive polymers, an emerging field of research for "smart" materials that sense and respond to environmental stimuli. Simply put, it is a polymeric material that reacts chemically after mechanical force is applied. The signal it emits can change color due to a chemical reaction triggered by the breaking of a chemical bond of a special component inside. When the mechano-responsive polymer material is subjected to an external force, it changes color. This ability of the material itself to respond to changes in the surrounding environment facilitates many potential applications in damage detection and catastrophic failure prevention...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/73C08G18/66C08G18/48C08G18/32C08G18/10
Inventor 朱明强向诗力龚文亮
Owner HUAZHONG UNIV OF SCI & TECH
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