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A polysiloxane with high-efficiency self-healing properties and its preparation method

A technology of polysiloxane and hydroxypolysiloxane, which is applied in the chemical field, can solve the problems of low self-repair rate and achieve the effect of promoting repair, improving mechanical properties, improving migration and movement characteristics

Active Publication Date: 2021-10-22
GENERAL ENG RES INST CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of low self-healing rate of polysiloxane polymers in the above-mentioned prior art, the present invention provides a polysiloxane with high-efficiency self-healing properties and a preparation method thereof. The invention has self-healing properties The tensile strength of polysiloxane is greater than 3.0MPa, and the elongation at break is greater than 110%. After the cut sample is placed at room temperature for 24 hours, the mechanical properties recover to at least 91% before cutting.

Method used

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  • A polysiloxane with high-efficiency self-healing properties and its preparation method
  • A polysiloxane with high-efficiency self-healing properties and its preparation method
  • A polysiloxane with high-efficiency self-healing properties and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 5 g of pyridine-4-boronic acid and 60 g of white carbon black in a ball mill jar, and ball mill for 20 h at room temperature to obtain a white solid powder.

[0031] Mix the above powder with 200g polydimethylsiloxane disilanol (M n ~24KDa) was put into the internal mixer and mixed for 20 minutes to obtain a white powdery solid. The obtained solid was placed in an aluminum pan, and then heated to 160° C. in an oven for 4 hours to obtain a white hard solid. The obtained solid can be molded by heating (130°C, 12MPa).

[0032] The self-healing curve of the obtained polysiloxane sample is as follows figure 1 shown. It can be seen that the strength of the cut sample reached 99% of the original sample after 24h room temperature repair.

Embodiment 2

[0034] Weigh 5g of 4-(N,N’-dimethylamino)-phenylboronic acid and dissolve it in 20mL of tetrahydrofuran, then stir and mix with 200g of polydimethylsiloxane disilanol (Mn~24KDa). After mixing, THF was removed under reduced pressure, and the resulting clear liquid was mixed with 60 g

[0035] White carbon black was added into the internal mixer and mixed for 20 minutes to obtain a white powdery solid. The obtained solid was placed in an aluminum pan, and then heated to 160° C. in an oven for 4 hours to obtain a hard purple solid. The obtained solid can be molded by heating (130°C, 12MPa).

[0036] The self-healing curve of the obtained polysiloxane sample is as follows figure 2 shown. It can be seen that the strength of the cut sample reached 94% of the original sample after 24h room temperature repair.

Embodiment 3

[0038] Weigh 5g of 4-(N,N')-dimethylamino-phenylboronic acid and dissolve it in 20mL of tetrahydrofuran, then mix with 200g of poly(dimethyl-co-methylphenyl)siloxane disilanol (Mn~13KDa, 20%wt of phenyl) stirred and mixed evenly. After mixing, the tetrahydrofuran was removed under reduced pressure, and the obtained clear liquid and 60 g of white carbon black were added to an internal mixer and mixed for 20 minutes to obtain a white powdery solid. The obtained solid was placed in an aluminum pan, and then heated to 160° C. in an oven for 4 hours to obtain a hard purple solid. The obtained solid can be shaped by heating and pressing (150°C, 12MPa).

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Abstract

The invention discloses a polysiloxane with high-efficiency self-healing properties and a preparation method thereof. The polysiloxane with high-efficiency self-healing properties includes the following raw materials: nitrogen-containing phenylboronic acid and hydroxyl-terminated polysiloxane. The weight ratio of niphenylboronic acid to hydroxyl-terminated polysiloxane is 1:40. The invention can obtain polysiloxane with self-healing property through chemical reaction. The tensile strength of the obtained polymer was greater than 3.0 MPa, and the elongation at break was greater than 110%. The mechanical properties of the cut samples recovered to at least 91% before cutting after being placed at room temperature for 24 hours.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a polysiloxane with high-efficiency self-repairing properties and a preparation method thereof. Background technique [0002] Due to their good thermal stability and chemical and physical compatibility, polysiloxane polymers are widely used in many fields of national defense and daily applications, providing a material basis for the development of various fields. Similar to other types of polymer materials, this type of material also has cracks caused by its own processing defects and external forces during use. These cracks often develop into cracks under the action of external forces, affecting the integrity of the system and leading to material failure. Performance or even the failure of the entire system performance. A variety of preparation methods of polysiloxane with self-healing properties have been developed in the literature, but the methods reported so far are complicated and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/04C08K5/55C08K3/36
CPCC08K3/36C08K5/55C08L83/04C08L2205/025
Inventor 邢涛何韧吴菊英黄渝鸿李保强
Owner GENERAL ENG RES INST CHINA ACAD OF ENG PHYSICS
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