Self-healing polymer and its preparation method and application

Abstract

The present invention discloses a self-repair polymer, a preparation method and applications thereof, wherein the self-repair polymer is the copolymer of an alkali monomer and an acidic monomer, or the copolymer of an alkali monomer, an acidic monomer and a neutral monomer. The preparation method comprises: carrying out a solution polymerization or bulk polymerization reaction on an alkali monomer, an acidic monomer and a neutral monomer under a thermal initiation or light initiation condition. According to the present invention, the damaged part of the self-repair polymer can be re-constructed at the room temperature so as to achieve the self-repair; the self-repair polymer has advantages of excellent mechanical property and adjustable performance; and the conditions of the preparation method are easy to control, such that the self-repair performance of the prepared self-repair polymer is stable, and the production cost is low.

Description

technical field

[0001] The invention belongs to the technical field of polymers, in particular to a self-healing polymer and its preparation method and application. Background technique

[0002] Organisms can self-repair and heal after local damage, while artificial materials often do not have this "self-repair" function, so the performance and service life of artificial materials will be reduced or even lost after damage. With the development of science and technology, artificial materials such as polymers have specific properties such as light weight, high strength, and corrosion resistance, and are widely used in aviation, transportation, construction, and sporting goods. However, during the processing and use of materials, micro-cracks and various damages inevitably occur on the surface and inside of materials 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 ma...

Examples

preparation example Construction

[0016] Correspondingly, the embodiment of the present invention also provides a method for preparing the above-mentioned self-healing polymer. This preparation method comprises the steps:

[0017] According to the molar ratio of basic monomer, acidic monomer and neutral monomer three monomers is (5-50): (5-50): (0-90) ratio will described basic monomer, acidic monomer Solution polymerization or bulk polymerization can be carried out under the conditions of thermal initiation or photoinitiation of monomers and neutral monomers.

[0018] Among them, the types and preferred mixing molar ratios of the basic monomers, acidic monomers and neutral monomers in the above method are the same as the basic monomers, acidic monomers and neutral monomers described in the self-healing polymer above. The type of body and the preferred mixing molar ratio. In order to save space, details are omitted here.

[0019] In the above method steps, under the conditions of thermal initiation or photo...

Embodiment 1

[0025] This embodiment provides a self-healing polymer, which is a copolymer of dimethylaminoethyl methacrylate, acrylic acid and n-butyl acrylate monomers.

[0026] Its preparation method is as follows:

[0027] In terms of mole fractions, 10 parts of dimethylaminoethyl methacrylate, 10 parts of acrylic acid, 79.9 parts of n-butyl acrylate, 0.1 part of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methyl Propiophenone was added into the flask, stirred in a nitrogen atmosphere for 30 minutes, then transferred into a mold, and reacted under 365nm UV-LED irradiation for 1 hour to obtain the self-healing polymer. It is measured that the tensile strength of the self-healing polymer provided by Example 1 is 1.3 MPa, the modulus is 1 MPa, the elongation at break is 280%, and the self-healing efficiency is 85% in terms of strength.

Embodiment 2

[0029] This embodiment provides a self-healing polymer, which is a copolymer of diethylaminoethyl methacrylate, methacrylic acid and n-ethyl acrylate monomers.

[0030] Its preparation method is as follows:

[0031]In terms of mole fractions, 10 parts of diethylaminoethyl methacrylate, 15 parts of methacrylic acid, 74.9 parts of n-ethyl acrylate, and 0.1 part of 2,4-diethylthiazolone were added to the flask, and in a nitrogen atmosphere Stir for 30 minutes, then transfer into a mold, and react under 365nm UV-LED irradiation for 1 hour to obtain the self-healing polymer. The tensile strength of the self-healing polymer provided by Example 2 is 1.7 MPa, the modulus is 1.4 MPa, the elongation at break is 310%, and the self-healing efficiency is 80% in terms of strength.

technical field

[0001] The invention belongs to the technical field of polymers, in particular to a self-healing polymer and its preparation method and application. Background technique

[0002] Organisms can self-repair and heal after local damage, while artificial materials often do not have this "self-repair" function, so the performance and service life of artificial materials will be reduced or even lost after damage. With the development of science and technology, artificial materials such as polymers have specific properties such as light weight, high strength, and corrosion resistance, and are widely used in aviation, transportation, construction, and sporting goods. However, during the processing and use of materials, micro-cracks and various damages inevitably occur on the surface and inside of materials 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 ma...

Examples

preparation example Construction

[0016] Correspondingly, the embodiment of the present invention also provides a method for preparing the above-mentioned self-healing polymer. This preparation method comprises the steps:

[0017] According to the molar ratio of basic monomer, acidic monomer and neutral monomer three monomers is (5-50): (5-50): (0-90) ratio will described basic monomer, acidic monomer Solution polymerization or bulk polymerization can be carried out under the conditions of thermal initiation or photoinitiation of monomers and neutral monomers.

[0018] Among them, the types and preferred mixing molar ratios of the basic monomers, acidic monomers and neutral monomers in the above method are the same as the basic monomers, acidic monomers and neutral monomers described in the self-healing polymer above. The type of body and the preferred mixing molar ratio. In order to save space, details are omitted here.

[0019] In the above method steps, under the conditions of thermal initiation or photo...

Embodiment 1

[0025] This embodiment provides a self-healing polymer, which is a copolymer of dimethylaminoethyl methacrylate, acrylic acid and n-butyl acrylate monomers.

[0026] Its preparation method is as follows:

[0027] In terms of mole fractions, 10 parts of dimethylaminoethyl methacrylate, 10 parts of acrylic acid, 79.9 parts of n-butyl acrylate, 0.1 part of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methyl Propiophenone was added into the flask, stirred in a nitrogen atmosphere for 30 minutes, then transferred into a mold, and reacted under 365nm UV-LED irradiation for 1 hour to obtain the self-healing polymer. It is measured that the tensile strength of the self-healing polymer provided by Example 1 is 1.3 MPa, the modulus is 1 MPa, the elongation at break is 280%, and the self-healing efficiency is 85% in terms of strength.

Embodiment 2

[0029] This embodiment provides a self-healing polymer, which is a copolymer of diethylaminoethyl methacrylate, methacrylic acid and n-ethyl acrylate monomers.

[0030] Its preparation method is as follows:

[0031]In terms of mole fractions, 10 parts of diethylaminoethyl methacrylate, 15 parts of methacrylic acid, 74.9 parts of n-ethyl acrylate, and 0.1 part of 2,4-diethylthiazolone were added to the flask, and in a nitrogen atmosphere Stir for 30 minutes, then transfer into a mold, and react under 365nm UV-LED irradiation for 1 hour to obtain the self-healing polymer. The tensile strength of the self-healing polymer provided by Example 2 is 1.7 MPa, the modulus is 1.4 MPa, the elongation at break is 310%, and the self-healing efficiency is 80% in terms of strength.