Response feedback type mechanochromic polymer material and preparation method thereof

A polymer material and chromic technology, applied in the field of response feedback type mechanochromic polymer materials and their preparation, can solve the problem of inability to feedback destructive stress, achieve novel technical route, strong product practicability, and overcome erroneous feedback Effect

Active Publication Date: 2021-02-19
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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  • Response feedback type mechanochromic polymer material and preparation method thereof
  • Response feedback type mechanochromic polymer material and preparation method thereof
  • Response feedback type mechanochromic polymer material and preparation method thereof

Examples

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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] Wherein, 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 and 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 fo...

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 (1eq.), bromocoumarin derivative (1eq.) and tetramethylguanidine (1eq.) to the solvent dimethyl sulfoxide, and react at room temperature After 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 (1eq.), 2-bromoethanol (3eq.) and potassium carbonate (4eq.) obtained in step a1, add acetone to reflux reaction overnight, and concentrate the crude product Obtain the target compound precursor through column chroma...

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 example and Example 1 is that the molar percentages of the target compound monomer M1, PEG1000 and HDI in step b are 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, co-polymerizing a target compound monomer in which a chromotropic group (coumarin dimer derivative) and a self-enhancing group (dihalocyclopropane) are connected in parallel, a polyol monomer and polyisocyanate to obtain a mechanochromic polymer; and S2, blending the mechanochromic polymer, a catalyst and a small molecular salt cross-linking agent, and carrying out compression molding to obtain a response feedback type mechanochromic material. According to the invention, when the response feedback type mechanochromic polymer material prepared by the method is stressed, a chromotropic group is firstly subjected to ring opening to change the fluorescence property to give an early warning, and then a self-enhancing group is subjected to stress to generate a cross-linking reaction, so that the purposes of discolorationearly warning and mechanical strength enhancement when the material is subjected to destructive stress are finally achieved; and the technical route is novel, the material practicability is high, andthe application of the material in the fields of intelligent polymer materials, mechanical sensing and the like is greatly promoted.

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 Applications(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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