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A kind of response feedback type mechanochromic polymer material and preparation method thereof

A polymer material and a color-induced technology, which is applied in the field of response-feedback mechanochromic polymer materials and their preparation, can solve problems such as inability to feedback destructive stress, achieve novel technical routes, overcome error feedback, and have strong product practicability Effect

Active Publication Date: 2022-04-22
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the currently reported systems can give an early warning of discoloration response to the stress concentration site, they cannot feed back this potential destructive stress (CN202010094586.8, CN202010386897.1, CN202010139151.0)

Method used

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  • A kind of response feedback type mechanochromic polymer material and preparation method thereof
  • A kind of response feedback type mechanochromic polymer material and preparation method thereof
  • A kind of response feedback type mechanochromic polymer material and preparation method thereof

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preparation example Construction

[0038] The invention provides a response feedback type mechanochromic polymer material, the preparation method of which comprises the following steps:

[0039] S1. Copolymerize the target compound monomer, polyol monomer and polyisocyanate in which the color-changing group is connected in parallel with the self-reinforcing group to obtain a mechanochromic polymer;

[0040] Among them, the molar content of the target compound monomer is 5% to 30%; the polyol monomer is polyethylene glycol, ethylene glycol, 1,3-propanediol, glycerol, 1,4-butanediol, 1, One or more of 5-pentanediol, 1,6-hexanediol; the polyisocyanate is hexamethylene diisocyanate (HDI), dicyclohexylmethane diisocyanate, diphenylmethane diisocyanate (MDI) , one or more of isophorone diisocyanate and toluene diisocyanate;

[0041] The chemical structural formula of the target compound monomer in which the color-changing group is connected in parallel with the self-enhancing group is:

[0042]

[0043] In the for...

Embodiment 1

[0049] Example 1: Response Feedback Mechanochromic Polymer Material SM-1

[0050] refer to figure 2 , the preparation method of response feedback type mechanochromic polymer material SM-1, comprises the following steps:

[0051] Step a: preparing a target compound monomer in which a color-changing group and a self-enhancing group are connected in parallel, specifically including the following steps:

[0052] Step a1: Add dicarboxylic acid dibromocyclopropane (1 eq.), bromocoumarin derivative (1 eq.) and tetramethylguanidine (1 eq.) into the solvent dimethyl sulfoxide, After reacting at room temperature for 3 hours, the system was poured into water, filtered and then vacuum-dried to obtain a coumarin derivative dimer;

[0053] Step a2: Mix the coumarin derivative dimer (1 eq.), 2-bromoethanol (3 eq.) and potassium carbonate (4 eq.) obtained in step a1, add it to acetone and reflux overnight, and concentrate the system Afterwards, the crude product is subjected to column chr...

Embodiment 2

[0057] Example 2: Response Feedback Mechanochromic Polymer Material SM-2

[0058] The difference between the preparation method of the response feedback type mechanochromic polymer material SM-2 of this embodiment and that of Example 1 is that the molar percentages of the target compound monomer M1, PEG1000 and HDI in step b are respectively 5%, 45% and 50%.

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Abstract

The invention discloses a response feedback type mechanochromic polymer material and a preparation method thereof. The preparation method comprises the following steps: S1, combining a color-changing group (coumarin dimer derivative) and a self-enhancing group (di Halocyclopropane) parallel target compound monomers, polyol monomers and polyisocyanates are copolymerized to obtain mechanochromic polymers; S2, after blending mechanochromic polymers, catalysts and small molecular salt crosslinking agents Press molding to obtain a response-feedback mechanochromic material; when the response-feedback mechanochromic polymer material prepared by this method is under force, the color-changing group first undergoes ring-opening to change the fluorescent properties to give an early warning, and then the self-reinforcing group The cross-linking reaction occurs under stress, and finally achieves the purpose of enhancing the mechanical strength while the material changes color and warns when it is subjected to destructive stress. applications in sensory fields.

Description

technical field [0001] The invention belongs to the technical field of organic intelligent polymer materials, and in particular relates to a response feedback type mechanochromic polymer material and a preparation method thereof. Background technique [0002] Inspired by natural organisms, mechanochromic polymer materials (MCPs) have attracted extensive research in recent years, and they have applications in many fields, such as mechanical sensing, secure communication, and human motion monitoring. The absorption spectrum or fluorescence emission spectrum of this kind of material will change significantly when it is deformed by force, which can be used to display and measure the degree of microscopic stress on the internal molecular chain of the material, and to understand the molecular mechanism of total energy dissipation in the process of material crack growth. Clarification is very important. [0003] There are two main categories of mechanochromic polymer materials, na...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/32C08G18/48C08G18/66C08L75/08C08L75/04C08K5/31
CPCC08G18/381C08G18/3808C08G18/3804C08G18/4833C08G18/6666C08G18/3206C08K5/31C08L75/08C08L75/04
Inventor 张娜陶慷汪太生
Owner NANJING INST OF TECH
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