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Room temperature self-repair thermoplastic polymer material

A thermoplastic polymer self-healing technology, applied in the field of room temperature self-healing thermoplastic polymer materials, can solve the problems of weak repair strength and limited thermoplastic self-healing technology, and achieve the goals of increasing bonding capacity, simplifying preparation, and high repairing efficiency Effect

Inactive Publication Date: 2011-08-17
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that in the past, the self-healing of thermoplastic materials made more use of intermolecular interactions (hydrogen bonds, chain entanglements), or was limited to some polymers with specific structures, which made the repair strength weaker. , on the other hand limits the use of thermoplastic self-healing technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of microcapsules containing liquid vinyl monomers: 11.36 g of melamine and 24.3 g of 37% (weight ratio) formaldehyde solution and 30 ml of distilled water were added to a three-necked reaction flask at 60 to 70 ° C and a pH value of 8 to 9. After 20-30 minutes of reaction, a transparent melamine-formaldehyde prepolymer solution is obtained. Add 0.4 g of sodium dodecylbenzenesulfonate, 0.12 g of polyvinyl alcohol and 41 g of glycidyl methacrylate, and emulsify for 30 minutes at a rotation speed of 400 rpm. Slowly adjust the pH value of the reaction system to about 4.1 with 5% glacial acetic acid, and slowly raise the temperature to 65 o C, maintaining the reaction temperature for 3 hours. The reaction solution was cooled to room temperature, washed with water to leave a layer of product, filtered, and dried at room temperature to obtain a white microcapsule product with good fluidity. The average particle size of the synthesized microcapsules was analyzed t...

Embodiment 2

[0030] Add 25.0 g of methyl methacrylate, 0.119 g of cumyl dithiophenylacetate, and 0.068 g of azobisisobutyronitrile into a three-necked flask to fully dissolve them, and feed argon to maintain the reaction system as an inert atmosphere. at 45 o React at 24 hours at C, weigh 0.625 g of microcapsules loaded with glycidyl methacrylate prepared in Example 1, uniformly disperse in the above-mentioned polymethyl methacrylate prepolymer at room temperature, mix and degas Pour into a silicone mold and cure at room temperature for 96 hours under an argon atmosphere.

[0031] The cantilever beam impact specimen was used to conduct the fracture test and evaluate the repair efficiency of the material: the specimen was put into the 25 o Keep the temperature in a constant temperature oven at C for 2 hours, and then completely destroy it with the help of an impact instrument. Carefully align the fractured surface of the damaged sample, clamp the sample in a repair fixture, and quickly put...

Embodiment 3

[0034] Add 25.0 g of methyl methacrylate, 0.119 g of cumyl dithiophenylacetate, and 0.068 g of azobisisobutyronitrile into a three-necked flask to fully dissolve them, and feed argon to maintain the reaction system as an inert atmosphere. at 45 o React at 24 hours at C, weigh 1.25 g of microcapsules loaded with glycidyl methacrylate prepared in Example 1, and uniformly disperse them in the above-mentioned polymethyl methacrylate prepolymer at room temperature, after mixing and degassing Pour into a silicone mold and cure at room temperature for 96 hours under an argon atmosphere.

[0035] The evaluation method is the same as in Example 2. The results are shown in Table 1.

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Abstract

The invention relates to the technical field of self-repair materials, and discloses a room temperature self-repair thermoplastic polymer material. The material consists of the following components in percentage by weight: 77 to 94 percent of monomers for preparing thermoplastic resin matrix, 0.6 to 1.5 percent of initiator for preparing the thermoplastic resin matrix, 0.2 to 2.6 percent of chain transfer agent for preparing the thermoplastic resin matrix, and 2.5 to 20 percent of microcapsules containing vinyl monomers. According to the room temperature self-repair thermoplastic polymer material, when micro cracks are generated due to the action of an external force in use, the microcapsules embedded into the matrix crack to release a repair agent, and the repair agent and the matrix can undergo reversible addition-fragmentation transfer free radical polymerization, so that the fractured surfaces are stuck together, the cracks are prevented from being further expanded, and self-repair of the material is realized. The prepared self-repair thermoplastic polymer material is simple to prepare, and can automatically complete repair of the cracks at room temperature.

Description

technical field [0001] The invention relates to a room temperature self-healing thermoplastic polymer material. Background technique [0002] With the development of science and technology, polymer composite materials with the characteristics of light weight, high strength, corrosion resistance and good insulation properties are widely used in human production and life. However, during the processing and use of materials, microcracks and local damage are inevitably generated due to the influence of external conditions. These microcracks lead to a decrease in the mechanical properties of the material, shorten the service life of the material, and eventually lead to the overall destruction of the material; in the case of being caught off guard, it will have extremely bad consequences. Therefore, the early identification and repair of micro-cracks and damage in materials is extremely important, which is an important way to ensure the stability of composite materials and extend...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F293/00C08F120/14C08F112/08B29C73/16
Inventor 姚丽章明秋容敏智
Owner SUN YAT SEN UNIV
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