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A method for evaluating the self-healing ability of polymer-based self-healing membranes

A self-healing, polymer technology used in testing composite materials, preparation of test samples, material analysis using radiation diffraction, etc. It can solve the difficulty of building multiple precise cracks, and the depth, width and position cannot be precisely controlled. , Research on the limitations of self-healing performance of polymer-based materials

Active Publication Date: 2022-04-01
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are the following problems in this process: (1) the cracks cut out are not nanometer and submicron size cracks; (2) the depth, width and position of the cut cracks cannot be precisely controlled, and complex and controllable morphology cannot be performed. Crack construction; (3) It is difficult to construct multiple precise cracks at the same position in polymer matrix composites with self-healing function
The above problems limit the research on the self-healing properties of polymer-based materials, and it is difficult to systematically compare the self-healing capabilities of different polymer-based materials.

Method used

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  • A method for evaluating the self-healing ability of polymer-based self-healing membranes
  • A method for evaluating the self-healing ability of polymer-based self-healing membranes
  • A method for evaluating the self-healing ability of polymer-based self-healing membranes

Examples

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Effect test

Embodiment 1

[0068] A method for evaluating the self-healing ability of polymer-based self-healing membranes. Firstly, sample preparation of polymer-based self-healing membranes: use a glass knife to cut branched polyethyleneimine and polyacrylic acid multilayer membranes non-destructively to make the membrane The dimensions are: the thickness of the film is 60 μm, the length is 2 cm, and the width is 2 cm;

[0069] The prepared film was subjected to the etching-self-repairing-measurement process, and the test results were not in compliance, as shown in the table below; among them, the specific crack structure in etching is shown in the table below (the corresponding grade is excellent), and the self-repairing The process is as follows: the etched film is placed in deionized water at a temperature of 20° C. for 30 minutes of self-repair.

[0070] Otherwise, re-select the sample for the process of sample preparation-etching-self-repairing-measurement, and the test results are not in complia...

Embodiment 2

[0075] A method for evaluating the self-healing ability of polymer-based self-healing membranes. Firstly, sample preparation of polymer-based self-healing membranes: non-destructive cutting of branched polyvinylimmonium and polylactic acid multilayer membranes with a glass knife to make the membrane The size is: the thickness of the film is 55 μm, the length is 2 cm, and the width is 2 cm;

[0076] The prepared film was subjected to the etching-self-repairing-measurement process, and the test results were not in compliance, see the table below for details; among them, the specific crack structure in etching is shown in the table below (the corresponding grade is excellent), and the self-repairing The process is as follows: the etched film is placed in deionized water at a temperature of 25° C. for self-repairing for 30 minutes.

[0077] Then, re-select the sample for the process of sample preparation-etching-self-repairing-measurement, and the test results are compliant, see t...

Embodiment 3

[0081] A method for evaluating the self-healing ability of polymer-based self-healing membranes. Firstly, sample preparation of polymer-based self-healing membranes: using a scalpel to cut polyvinyl alcohol-polyacrylic acid self-healing hydrogel electrolyte membranes non-destructively to make the membrane The dimensions are: the thickness of the film is 100 μm, the length is 3 cm, and the width is 3 cm;

[0082] Carry out the process of etching-self-repairing-measurement on the prepared film, the test results are in compliance, see the table below for details; among them, see the table below for the specific crack structure in etching (the corresponding grade is excellent), the process of self-repairing For: the etched film is placed in deionized water at a temperature of 22°C for self-repairing for 30 minutes.

[0083] Then the self-healing ability grade of the polyvinyl alcohol-polyacrylic acid self-healing hydrogel electrolyte membrane is "excellent".

[0084]

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Abstract

The invention relates to a method for evaluating the self-healing ability of a polymer-based self-healing film. The polymer-based self-healing film is subjected to a sample preparation-etching-self-repairing-measurement process. When there are obvious cracks in the appearance visually or D is greater than the threshold K, the process of sample preparation-etching-self-repairing-measurement is repeated, and the specific crack structure etched is the next level of self-repairing ability in the previous etching Corresponding structure; when the measurement results meet the requirements, that is, when the crack morphology has no obvious cracks visually and D is less than or equal to the threshold K, then the self-healing ability level of the polymer-based self-healing film is the specific crack in this etching The grade corresponding to the structure; the specific crack structure is composed of cracks with the same spacing, and the size of each crack is expressed by diameter and depth or width and depth; the self-healing ability grade is divided into four grades: excellent, good, medium and poor.

Description

technical field [0001] The invention belongs to the technical field of composite material evaluation, and relates to a method for evaluating the self-repair ability of a polymer-based self-repair membrane. Background technique [0002] Polymer matrix composites with self-healing function can imitate the self-healing mechanism of biological damage, so that microscopic cracks that are difficult to find with the naked eye during material processing or use can be self-healed. Polymer materials whose performance has reached the requirements of engineering material indicators will inevitably produce cracks during use, and then contain hidden dangers during use until they lose their use value. Early repair of cracks, especially self-healing is a real and important problem. Therefore, it is particularly important to evaluate the self-healing performance of the material before use, which can better protect the material from environmental damage, and also select the appropriate self-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/84G01N23/04G01N23/20G01N23/2005G01N1/28G01N1/32G01B11/30G01B15/04
CPCG01N21/84G01N21/8422G01N23/04G01N23/20G01N23/2005G01N1/286G01N1/32G01B11/30G01B15/04G01N2021/8472G01N2001/2873
Inventor 陈洪旭李海东程凤梅陈超林祥松
Owner JIAXING UNIV
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